Home Page       Exam Question Downloads    Download TesTTaker Software    Free Sample Downloads   Maritime Links     Member Comments      Contact SeaSources  Boat Jobs Available

Click Here to Register and Begin Preparing For Your Exam with SeaSources Online Study.

This page is just a preview of the new Coast Guard question database. To test yourself on these questions click on the big blue link above.

Click here to see detailed video instructions on using SeaSources.net online license preparation.

New Engineering General Subjects II from 25 Sept 2012


1

A "hygroscopic" lubricant used in refrigeration compressors would have what characteristic?

losing its lubrication qualities at higher temperatures

being highly toxic

decreasing in viscosity at low temperatures

having a high affinity for moisture which requires it to be kept in a sealed container.

2

A bent axis, variable stroke, axial piston pump produces a greater capacity than a comparable tilting box-type axial piston pump, because the .

piston diameters are smaller

length of stroke is greater

RPM is doubled

discharge/return line diameter are arranged differently

3

A Bourdon tube pressure gage is protected from the effects of the steam entering the pressure element by a/an .

exposed, uninsulated coil in the line leading to the gage

impulse-type steam trap in the gage line

leather or neoprene diaphragm in the gage line

spring loaded bellows in the gage line

4

A bourdon tube-type steam pressure gage is fitted with a siphon loop to prevent damage from .

extreme thermal stress

the admission of condensate

pressure shock

differential expansion rates

5

A Bourdon tube-type steam pressure gage is fitted with a siphon loop to prevent damage from the direct effects of .

pressure shock

uneven expansion

entering condensate

entering steam

6

A box solenoid valve used in a mult-box rerigeration system is operated by electro-magnetic action by what control device?

suction pressure actuated pressure switch

box temperature actuated thermostat

evaporator outlet temperature actuated thermostat

discharge pressure actuated pressure switch

7

A box solenoid valve used in a refrigeration system should be installed in what manner?

with the axis of the solenoid horizontal, controlled by a thermostat sensing the temperature of the box, and upstream of the thermal expansion valve

upright, controlled by a thermostat sensing the temperature of the box, and upstream of the thermal expansion valve

upright, controlled by a thermostat sensing the temperature of the box, and downstream of the thermal expansion valve

upright, controlled by a thermostat sensing evaporator superheat, and upstream of the thermal expansion valve

8

A cargo hold has been determined to have a relative humidity of 80% and a dry bulb temperature of 85F. When the hold is closed up by closing the cargo hold hatch and the dry bulb temperature decreases, what will happen to the relative humidity in the space?

decrease

increase

decrease to zero

remain unchanged

9

A casing drain is provided for axial piston and bent axis variable stroke pumps to .

vent off any accumulated air from the system

drain off any accumulated water from the pump casing prior to its being started

assist the complete removal of hydraulic oil from the system prior to opening for major or minor repairs

prevent damage due to agitation and overheating of oil accumulated in the casing as a result of normal internal leakage

10

A check run on a hydraulic anchor windlass during long periods of inactivity should be carried out to .

prevent chemical breakdown of hydraulic fluid

remove condensation from the fluid reservoir

prevent the anchor from seizing in the hawsepipe

renew the internal coating of lubrication

11

A chief engineer's responsibilities include making logbook entries whenever fuel oil is received. In accordance with Coast Guard Regulations (46 CFR), this log entry must include the .

name of the vendor

name of the oil producer

flash point (closed cup method) of the fuel oil certified by the producer

all of the above

12

A Coast Guard engineer's license can be suspended or revoked for .

failure to attend safety meetings

having your wages garnished

being responsible for an oil spill ashore

conviction of any misdemeanor ashore

13

A Coast Guard issued engineer's license may be suspended or revoked for .

the violation of a narcotic drug law

the commission of an act of misconduct

the violation of federal water pollution law

all of the above

14

A cofferdam is a/an .

empty space between tank tops and bilges

cement baffle in a fresh water tank

tank for storing chemicals

empty space separating compartments to prevent the contents of one compartment from entering another in case of leakage

15

A command signal input to the steering gear has initiated rudder movement for 20 right rudder. The follow-up mechanism at the beginning of the rudder movement will .

be in motion with a null input

not be in motion with a null input

be in motion providing an input to place the variable stroke pump on maximum stroke

be in motion providing an input to place the variable stroke pump on null stroke

16

A common secondary refrigerant used in air conditioning systems aboard ship is what substance?

R-123

water

nitrogen

hydrogen

17

A compound Bourdon tube gage is capable of measuring pressure and .

humidity

vacuum

temperature

density

18

A compound Bourdon tube type pressure gage is capable of measuring .

temperature and pressure

wet bulb and dry bulb temperatures

humidity and temperature

pressure and vacuum

19

A compound gage is typically installed on the .

suction side of a bilge pump

exhaust manifold of an auxiliary diesel

discharge line from an air compressor

chemical feed tank of an evaporator

20

A compound gage is used to measure .

temperature and pressure

humidity and temperature

pressure and vacuum

pressure and humidity

21

A compressor operating with an accumulation of dust and grease on the surfaces of an intercooler would result in . I. a high consumption of lube oil II. higher than normal air pressure in the receiver

I only

II only

Both I and II

Neither I nor II

22

A compressor operating with an accumulation of dust and grease on the surfaces of an intercooler would result in . I. the motor to run warmer than usual II. the second stage would operate at a higher temperature

I only

II only

Both I and II

Neither I nor II

23

A compressor used in a multi-box refrigeration system has 4 of its 6 cylinders controlled for variable loads. Assuming that the controlled cylinders are unloaded singly in incremental steps, if four of five boxes are currently feeding, what will be compressor capacity at step 1 of incremental unloading?

83.3%

66.7%

50%

33.3%

24

A compressor used in a multi-box refrigeration system has 4 of its 6 cylinders controlled for variable loads. Assuming that the controlled cylinders are unloaded singly in incremental steps, if only one of five boxes is currently feeding, what will be compressor capacity at step 4 of incremental unloading?

83.3%

66.7%

50%

33.3%

25

A compressor used in a multi-box refrigeration system has 4 of its 6 cylinders controlled for variable loads. Assuming that the controlled cylinders are unloaded singly in incremental steps, if three of five boxes are currently feeding, what will be compressor capacity at step 2 of incremental unloading?

83.3%

66.7%

50%

33.3%

26

A compressor used in a multi-box refrigeration system has 4 of its 6 cylinders controlled for variable loads. Assuming that the controlled cylinders are unloaded singly in incremental steps, if two of five boxes are currently feeding, what will be compressor capacity at step 3 of incremental unloading?

83.3%

66.7%

50%

33.3%

27

A constant hissing sound at the thermal expansion valve will always indicates what condition?

proper refrigerant control

a faulty refrigerant control valve

a lack of refrigerant

the flow of 100% liquid refrigerant passing to the evaporator

28

A continuous watertight bulkhead on a MODU may also be a/an .

structural bulkhead

exterior bulkhead

centerline bulkhead

joiner bulkhead

29

A control action which produces a corrective signal relative to the length of time the controlled variable has been away from the set point, is known as .

integral action

proportional action

rate action

derivative action

30

A control action which produces a corrective signal relative to the speed at which the controlled variable is changing is known as .

reset action

integral action

derivative action

proportional action

31

A controller with floating action has a controlled variable where the range of values produces no motion of the final control element. This range of values is called the .

neutral zone

set point

control point

offset

32

A device incorporating a variable orifice placed in series with a check valve in a hydraulic system, is used to .

allow free movement of hydraulic fluid in both directions

allow fluid flow in one direction only

allow throttled fluid flow in one direction only

restrict hydraulic fluid flow in both directions

33

A device used to hold open the refrigeration compressor suction valve during starting to reduce the compression load is called what?

discharge line bypass

cylinder unloader

suction line bypass

relief valve

34

A dirty intercooler on an air compressor will cause .

damage to the unloader operating diaphragm

an increase in current flow to the motor

high pressure in the receiver

an excessive consumption of crankcase oil

35

A dirty intercooler on the ship service air compressor will result in .

decreased compression ratio

higher than normal power consumption

unloader malfunction

water in the lubricating oil

36

A first stage unloader installed in a low pressure air compressor is unable to completely retract. This will result in .

overheating of the discharge valve

loss of moisture in the air charge in the receiver

frequent lifting of the intercooler relief valve

an abnormally low intercooler pressure

37

A flapper valve, also known as a beam valve, is frequently used in refrigeration compressor discharge valves, and is used for what purpose?

feed discharge pressure to the suction line for capacity control

aid in hot gas defrosting

prevent compressor damage by passing any liquid slugs

equalize system pressure for easier compressor startup

38

A fluid power system shall be so designed .

that proper functioning of any unit shall not be affected by the back pressure in the system

to maintain a back pressure throughout the power cylinders operating range

such that the operation of any unit in the system will provide for sufficient back pressure

none of the above are correct

39

A fuel oil tank pneumercator will give an inaccurate reading if the .

pneumercator is recharged with the air supply open

pneumercator balance chamber bleed orifice is blocked by the oil being measured

pressure in the system is allowed to equalize

operating cock is placed in the 'vent' position when the system is not in use

40

A gradual decrease in the discharge pressure of an operating hydraulic pump can be caused by .

the four-way control valve failing to shift

the bleeder valve sticking in the open position

cold hydraulic fluid

a clogged air vent filter on the oil reservoir

41

A hydraulic accumulator, used in a hydraulic system aboard a MODU, is designed to .

store fluid under pressure

act as the main fluid reservoir

provide the only means of overpressure relief

act as the singular source of fluid replenishment to a system

42

A hydraulic flow control circuit is shown in the illustration, and is known as a .

metered-in circuit

metered-out circuit

bleed-in circuit

bleed-off circuit

43

A hydraulic fluid flow control circuit, controlling linear actuator speed, with the pump operating below maximum operating pressure is known as the .

metered-in circuit

metered-out circuit

bleed-in circuit

bleed-off circuit

44

A hydraulic fluid flow control circuit, controlling linear actuator speed during extension, with the pump operating at system pressure, is known as a .

metered-in circuit

metered-out circuit

bleed-off circuit

bleed-in circuit

45

A hydraulic fluid flow control circuit, used to control linear actuator speed during retraction, with the pump operating at above maximum pressure, is known as a .

metered-in circuit

metered-out circuit

bleed-in circuit

bleed-off circuit

46

A hydraulic system directional control valve fitted with 'detent' will .

have an infinite number of valve positions

usually be shifted into three specific positions

be able to be varied through out the travel of the valve spool

have an offset, directional control only

47

A hydraulic system flow-control circuit is shown in the illustration and is known as a .

metered-in circuit

metered-out circuit

bleed-off circuit

bleed-in circuit

48

A hydraulic system flow-control circuit is shown in the illustration and is known as a .

metered-in circuit

metered-out circuit

bleed-in circuit

bleed-off circuit

49

A hydraulic system gear pump being fed from a reservoir frequently indicates signs of excessive pitting after two months of service. Which of the following would most likely contribute to this condition?

Abnormal pressurization is occurring in the reservoir.

A partial restriction in the return line has developed.

A vacuum condition has developed in the reservoir.

Operating oil temperature is determined to be below normal.

50

A hydraulic system gear pump being fed from a reservoir indicates signs of excessive pitting after two months of service. Which of the following would most likely contribute to this condition?

Excessive dust conditions have clogged the reservoir breather cap.

A partial restriction in the return line has developed.

Abnormal pressurization is occurring in the reservoir.

Operating oil temperature is determined to be below normal.

51

A knocking sound emitted from an unloaded air compressor is probably caused by .

damaged intake valves

excessively tight mounting bolts

insufficient cylinder lubrication

a loose piston

52

A knocking sound from one cylinder of an operating air compressor indicates .

a defective or broken high pressure unloader

a loose valve plate

excessive overload

no compression

53

A large evaporator coil has been determined to have a pressure drop exceeding 5 psig. How can this be compensated for in maintaining 10 degrees of evaporator superheat as the system requires and avoid starvation of the evaporator? I. adjusting the TXV spring compression and raising the super heat value II. installing an externally equalized TXV

I only

II only

Both I and II

Neither I nor II

54

A leaking steam trap located in the return lines from a heating system is indicated by excessive .

drain tank steaming

scale returning from the convectors

steam pressure in the convectors

water in the heating system

55

A leaking suction valve in the second stage of a two stage, high pressure, air compressor can cause excessively high .

second stage discharge pressure

first stage discharge pressure

pressure in the aftercooler

compressor final discharge temperature

56

A licensed officer designated to certify a trainee's performance of a practical demonstration should sign off when .

another license officer has witnessed the performance of the demonstration

the majority of any portion of the skill has been demonstrated

the pre-brief with the trainee has been completed

the entire practical demonstration has been successfully completed and personally observed by the licensed officer

57

A lightening hole, shown in the illustration, is identified by the letter ' .'

A

H

J

all of the above

58

A liquid indicator sight glass is useful in determining whether or not a refrigeration system is sufficiently charged. Where is it generally located in the system?

high pressure liquid line

low pressure liquid line

high pressure vapor line

low pressure vapor line

59

A liquid line solenoid valve controls refrigerant flow to the evaporator by what means?

throttling the refrigerant

fully opening or closing

sensing the superheat in the tail coil

sensing the temperature in the liquid line

60

A liquid line to suction line heat interchanger in a refrigeration system using a reciprocating compressor serves what function?

reduce the possibility of liquid refrigerant slugging the compressor

raise the temperature of liquid refrigerant

cool the suction vapor returning to the compressor

raise the refrigerant saturation temperature in the evaporator

61

A liquid sight flow indicator in a refrigeration system is examined and gas bubbles are noted in motion with the fluid flow. What does this mean?

the system is fully charged

there is air leaking in from the condenser

ice crystals are forming in the refrigerant

the system contains less than a full charge of refrigerant

62

A low compressor discharge pressure for a refrigerator can be caused by which of the following?

warm food in the refrigerator

wasted zinc plates in the condenser

leaky compressor discharge valve plates

faulty door gaskets on the refrigerator

63

A lower thermostatic temperature setting will generally tend to cause what to happen in an air conditioned space?

lower relative humidity

lower air circulation

higher air circulation

higher relative humidity

64

A major controlling factor in the location of the condensate return piping from a heating system is/are .

the requirement for a gravity return

the requirement for short laterals run

the requirement to minimize conflict with headroom and other services

all of the above

65

A mandatory characteristic of a pure amplifier is that .

the form of the input and output energies must be the same

the ratio of the output to the input must always be greater than the numerical value of 'one'

the form of the input and output energies must be different

the action must be either integral or derivative

66

A mechanical and/or hydraulic action preventing the over- correction of the fuel supply, while producing transient speed droop is called .

stability

hunting

compensation

sensitivity

67

A mode of control, whereby the position of the final control element is linearly proportional to the rate of change of the controlled variable, is called .

reset control

integral control

two position control

derivative control

68

A mode of control, whereby the speed of motion of the final control element is linearly proportional to the deviation of the controlled variable from set point, is called .

rate control

derivative control

two position control

integral control

69

A MODU having continuous closely spaced transverse strength members is .

longitudinally framed

transversely framed

cellular framed

web framed

70

A mooring winch should be equipped with mechanical brakes capable of holding .

half the breaking strength of the mooring line

the full breaking strength of the mooring line

the maximum expected tension of the mooring line

50% over the working tension of the mooring line

71

A multiple evaporator system is equipped with a evaporator back pressure regulating valve on the warmer of the two boxes. This valve must be bypassed when pumping down the system for repairs because reduction of suction pressure would cause the valve to do what?

rupture

open

close

chatter

72

A one ton air conditioning system has which of the listed operating characteristics?

It forces 2,000 lbs. of refrigerant through the evaporator coil per day.

It forces 2,000 lbs. of air per hour across the evaporator coils.

It has the cooling capacity equivalent to melting 2,000 lbs. of ice per day.

It has the cooling capacity equivalent to melting 2,000 lbs. of ice per hour.

73

A partially fouled liquid line strainer in the refrigeration system will cause which of the following conditions? I. a loss of refrigeration effect II. the strainer outlet piping to be cooler than the inlet piping

I only

II only

Both I and II

Neither I nor II

74

A partially fouled liquid line strainer in the refrigeration system will cause which of the follwing changes in the system? I. further superheating of the suction gas II. further subcooling of the liquid

I only

II only

Both I and II

Neither I nor II

75

A piece missing from one blade of a four-bladed propeller could result in .

accelerated stern bearing wear

excessive shaft vibrations

unusual noises

all of the above

76

A pneumercator is an instrument used to indicate .

air pressure in the diesel engine starting circuit

phosphates in boiler water

tank fluid level

micro ohms in condensate

77

A pneumercator is used to indicate fuel oil .

pressure

level

temperature

flow

78

A pneumercator is useful in measuring .

relative humidity

air pressure

liquid levels in tanks

fluid pneumercations

79

A pneumercator measures the liquid level in a tank by sensing . I. head pressure II. liquid density

I only

II only

both I and II

neither I nor II

80

A pneumercator tank gage utilizes .

a Bourdon tube indicator

a balance chamber

an electronic sensing line

all of the above

81

A portion of the cargo of an LNG carrier boils off during each voyage. How is the cargo boil off normally handled?

Compressed, condensed, and return to the cargo tanks.

Vented to the atmosphere.

Burned in the boilers.

Mixed with nitrogen and recirculated through the primary barrier.

82

A possible cause of excessive crankcase sweating or frosting of a refrigeration system compressor may be caused by which of the following conditions?

a stuck open box solenoid valve

a shortage of refrigerant

too much oil in circulation resulting in an oil-logged evaporator

too much superheat

83

A pressure drop in the liquid line of a refrigeration system may cause what condition?

the solenoid valve to seize

the compressor to hunt

flash gas to form in the liquid line

the expansion valve to freeze open

84

A pressure drop through the refrigerant liquid line may cause what to occur?

solenoid valve to seize

compressor to hunt

formation of flash gas in the liquid line

expansion valve to freeze open

85

A pressure gage pointer responding sluggishly to changes in pressure, should be repaired by .

tapping the gage housing lightly

bending the needle to free the linkage

cleaning the residue from gear teeth

greasing the hair spring

86

A pressure gage, similar to device "D" shown in the illustration, is installed on the vessel's ventilation system. The gage is indicating 30 inches of water (7.465 kPa), but the accuracy of the gage is in doubt.Using a piece of clear hose, you construct a simple U tube mercury manometer, similar to device "C" illustrated. Once installed, the distance between the levels is 12.7 centimeters. How inaccurate is the existing draft gage?

The gage reads slightly lower, but the inaccuracy is too insignificant to be concerned.

The draft gage is correct when acknowledging the effects of absolute pressure on the system.

The existing draft gage indicates a pressure equal to atmospheric pressure.

The mechanical draft gage is indicating an error incorrect by 55 percent of the true measured value.

87

A primary element used with flow measurement devices highly suitable for liquids containing solids in suspension, is a .

concentric orifice

convergent nozzle

venturi tube

pilot tube

88

A proportional band or range adjustment to a bourdon tube pressure gage is accomplished by . I. adjusting the effective moment arm length between the end of the bourdon tube and the quadrant gear fulcrum II. adjusting the pointer position relative to the pinion shaft upon which it is mounted

I only

II only

Both I and II

Neither I nor II

89

A proportional band, or range adjustment of a bourdon tube pressure gage is accomplished by .

adjusting the effective moment arm length between the bourdon tube and the quadrant gear fulcrum

adjusting the pointer position relative to the shaft on which it is mounted

changing out the pointer pinion

flattening the cross- section of the bourdon tube

90

A 'P-tank' as used aboard oilfield supply boats is .

a pressure vessel designed to transport liquid drill mud

a pneumatically operated tank used transfer liquid drill mud

a pneumatically operated tank used to transfer dry, pulverized drilling materials

All of the above

91

A P-tank system .

is designed to transfer thick viscous liquids

is designed to pump chunks of cement

must be kept free of foreign objects

answers B and C above

92

A P-tank system, as used on oilfield supply boats .

must be kept free of moisture and water

is designed to transfer viscous liquids

is capable of pumping chunks of cement that find their way into the system

answers B and C above

93

A 'P-tank', as used aboard oilfield supply boats is .

a pressurized vessel designed to carry dry pulverized materials

a tank which is used to store compressed air at 100 psi

a pneumatically operated tank used to transport liquid drill mud

All of the above

94

A pure transducer utilizes .

integral action

rate action

proportional action

derivative action

95

A purge connection installed on the refrigerant side of a water cooled condenser at the top of the condenser shell is used for what purpose?

free tubes of accumulated scale

charge the system with refrigerant

remove noncondensable gases

ensure positive air circulation

96

A purge-recovery unit is used in a centrifugal air conditioning or refrigeration system for what purpose?

purge lube oil from the liquid refrigerant

recover water purged from the system

separate foul gases from the receiver

purge noncondensable gases while minimizing the loss of refrigerant

97

A pyrometer is capable of producing a voltage by .

chemical reaction

light striking a photo sensitive substance

heating a junction of two dissimilar metals

squeezing crystals of certain substances

98

A pyrometer is generally used to measure .

grains of moisture per cubic foot of air

salinity concentration of condensate

stack temperature

level of a fluid in a tank

99

A reciprocating air compressor is running roughly and vibrating excessively, indicating that the .

compressor is overloaded

motor is overloaded

foundation bolts are loose

belts are too tight

100

A reciprocating refrigeration compressor may be tested for leaking discharge valves by stopping the compressor, turning the discharge service valve all the way in, and then turning the compressor over by hand. If the discharge valves are leaking, the compound gage will show pressures which react in which way?

rising and falling with each stroke

increasing with each stroke

decreasing with each stroke

decreasing to a vacuum

101

A record of the types and strengths of steels used on a MODU must be included in the .

general plans

builder's documentation

Certificate of Inspection

construction portfolio

102

A refrigerant used in a mechanical refrigeration system should have which of the following characteristics?

High boiling point

High freezing point

Low specific heat

Low boiling point

103

A refrigerated container filled with 10,000 lbs. of strawberries has been loaded on your ship. The set point of the box is 35F and the interior box temperature is 90F, and after 7 hrs. 37 minutes the box is lowered to 60F. Based on the following information, which of the listed steps should be taken? Specific heat of cargo is 0.94 BTU/LB/F, heat gain by container equals 4,000 BTU/hr., and refrigeration system capacity equals 3.42 tons.

Do nothing as the system is operating correctly.

The compressor is worn out and should be replaced.

Replace the liquid line strainer.

Add freon to the unit to increase the refrigeration effect.

104

A refrigeration compressor used in a multi-box refrigeration system, is designed with six of its eight cylinders able to be controlled for variable load conditions. If all of the reefer boxes are currently feeding, what percentage of the total number of compressor cylinders will be loaded after start up?

100%

50%

25%

0%

105

A refrigeration plant has been prepared for opening up the system for non-major repairs by performing a system pumpdown and bringing the part of the system to be opened to 0 psig. At the completion of the repairs and after re- closing the system what is the recommended procedure?

performing a dehydration evacuation on that part of the system which was open with a deep vacuum pump

performing an evacuation on that part of the system which was open with a self- contained refrigerant recovery unit

purging that part of the system which was open with dry nitrogen

introduce the system charge into that part of the system which was open

106

A refrigeration system compressor crankcase is sweating, frosting or unusually cold. This is a possible indication of what condition?

a shortage of refrigerant in the system

air in the system

an accumulation of liquid refrigerant in the crankcase.

a shortage of oil in the crankcase

107

A refrigeration system contaminated with moisture can lead to what condition?

acid formation leading to corrosion

sludge formation in the crankcase

ice formation internal to the expansion valve

all of the above

108

A refrigeration system is equipped with a reciprocating compressor and a water cooled condensing unit. If the system is overcharged, the resulting high head pressure will be caused by what condition?

the expansion valve overfeeding the evaporator

a leaking compressor suction valve

an incorrectly adjusted high pressure cutout

refrigerant flooding the condenser

109

A refrigeration system low pressure cut-out switch has an adjustment advisory that states that the cut-out is the cut-in minus the differential. Currently the compressor starts a few moments after the thermostatically controlled box solenoid re-opens and begins feeding the evaporator meaning the cut- in value is properly set. As the box solenoid closes when the minimum desired box temperature is reached, the compressor stops almost instantly. As a result, the compressor short-cycles a few times before the pump-down is complete. What must be done to correct this?

the range adjustment must be adjusted upward

the differential adjustment must be adjusted to lower the cut-out

the range adjustment must be adjusted downward

the differential adjustment must be adjusted to raise the cut- out

110

A refrigeration unit will tend to short cycle when operating under what conditions?

under heavy loads

during hot gas defrost

lack of refrigerant

during starting conditions

111

A reheater in an air conditioning system performs what function?

controls the inlet air temperature

controls the inlet air volume

maintains the relative humidity at 15%

restores the conditioned air temperature to a comfortable level

112

A reheater, as used in an air conditioning system, is designed to control what temperature?

chilled water temperature

dew point temperature

primary air temperature

dry bulb room temperature

113

A relief valve is designed to protect the physical integrity of a refrigeration system as a result of over-pressurization. What device is designed to stop a running compressor before the relief valve lifts?

low pressure cutout switch

back pressure cutout switch

high pressure cutout switch

oil-failure switch

114

A 'Report of Marine Accident, Injury or Death', Coast Guard form 2692, must be filed with the Officer in Charge, Marine Inspection when a shipboard casualty results in .

the incapacitation of an injured crewman

the death of a yard or harbor worker in the engine room

the incapacitation of a yard worker due to a boiler flareback

All of the above.

115

A reservoir is used in a hydraulic system to .

store fluid until required by the system

provide a place for air to separate out of the fluid

provide a place for contaminants to settle out

all of the above

116

A reservoir, as used in hydraulic systems aboard ship, is used to store hydraulic oil. Another function is to .

act as a shock absorber

maintain the stored oil under pressure

act as a base or foundation for the power unit

eliminate pressure surges in the system

117

A room humidistat initiates the lowering of the humidity of the conditioned supply air to a space, while the actual process is accomplished by what means?

raising the cooling coil temperature and lowering the reheater temperature

raising both the cooling coil temperature and the reheater temperature

lowering both the cooling coil temperature and the reheater temperature

lowering the cooling coil temperature and raising the reheater temperature

118

A rotameter, when used to indicate the rate of fluid flow in distilling plants, is essentially an area meter consisting of a .

movable float riding on a rod centered in a tapered tube

piston uncovering a port whose opening is directly proportional to fluid flow

movable orifice plate venturi tube and high pressure tap

rotating vane transmitting nutating motion to a counter mechanism

119

A saltwater leak shorts out your switchboard causing a fire which does $(USA)27,500 damage to the electrical equipment. This must be reported to the .

insurance underwriter

U.S. Coast Guard

harbormaster

port engineer

120

A secondary refrigerant commonly used in shipboard air conditioning systems is what substance?

methyl chloride

treated water

carbon dioxide

trichloroethylene

121

A set point adjustment to a bourdon tube pressure gage is accomplished by . I. adjusting the effective moment arm length between the end of the bourdon tube and the quadrant gear fulcrum II. adjusting the pointer position relative to the pinion shaft upon which it is mounted

I only

II only

Both I and II

Neither I nor II

122

A ship travels 234.02 nautical miles in 24 hours at an average propeller speed of 60 RPM. If the propeller pitch is 20.07 feet, what is the propeller slip during this passage?

17.95%

20.46%

22.10%

26.20%

123

A short weighted hose is attached to the end of the P-tank fixed discharge line on board a supply boat to .

prevent accidental back flow of dry bulk material

maintain a non-vibrating delivery rate

prevent dry material from being discharged on deck

All of the above

124

A short, weighted hose is attached to the end of the P-tank fixed discharge line on board a supply boat to .

keep the end of the hose under water and prevent dust from blowing on the boat

maintain a low discharge flow rate

keep the end of the fixed discharge line from excessively vibrating

All of the above

125

A shot of anchor chain has a length of .

6 fathoms

12 fathoms

15 fathoms

45 fathoms

126

A shot of anchor chain is equal to .

one chain link

one - 90 foot segment

90 fathoms

one - 15 foot segment

127

A sight glass is installed in the liquid line to indicate the condition of the refrigerant charge and may also indicate what else?

condition of the expansion valve

moisture in the system

condition of the compressor suction valves

condenser temperature

128

A simple hydraulic system is made up of a pump, relief- valve, manual-control valve, and a linear actuator. If the piping connected to the actuator 'cap end' is accidentally crushed to one half of its diameter, this will result in .

slower actuator retraction speed

faster actuator retraction speed

faster actuator extension speed

all of the above

129

A simplified construction plan may be included in the MODU construction portfolio provided it adequately defines the .

areas where special materials are used

hazardous areas

location of emergency repair equipment

type and strength of materials used

130

A small obstruction at the thermostatic expansion valve inlet will result in which of the following conditions?

Lower than normal suction pressure.

Higher than normal discharge pressure.

Expansion valves are designed to pass small foreign particles so no adverse condition will occur.

Ice is the sole cause of this and will soon melt due to superheat; no adverse condition will occur.

131

A solenoid direct-acting three-position spring-centered directional control valve is used in a hydraulic system to control a linear actuator. When the remote push button is depressed to extend the actuator it fails to move, even though the pump is in operation. Which of the following statements represents the cause?

A spring at one spool end has broken and jammed, preventing the spool from shifting.

The 'extend' solenoid coil has developed an open.

The pump coupling is damaged and pump is unable to turn at its required speed.

Any one of the above will cause the actuator to not move.

132

A solenoid, direct-acting, three-position, spring-centered, directional control valve is used in a hydraulic system to control a linear actuator. Midway through extension, the push button is released, but the actuator continues to extend slowly. Which of the following conditions represents the probable cause?

A centering spring has broken and jammed the spool movement preventing the spool from recentering.

One of the two solenoids has sustained an open in its respective coil.

The pump coupling has been damaged preventing the pump from developing its required operating speed.

The detent mechanism has failed, preventing the valve from operating.

133

A solenoid, direct-acting, three-position, spring-centered, directional control valve is used in a hydraulic system to control a linear actuator. With the actuator under load there is no movement. However, when the load is removed the actuator can be cycled in both directions, although slower than normal. Which of the statements listed is the probable cause?

One or both of the centering springs has broken and the spool has jammed in the valve body.

One or both of the solenoid coils has sustained an open.

The pump coupling is damaged and the pump is unable to attain its rated speed of rotation.

The pump coupling has sheared and the motor is overspeeding.

134

A squealing sound generated by a reciprocating air compressor upon starting may indicate .

badly leaking valves

defective unloader

compressor interstage leakage

abnormally tight drive belts

135

A squealing sound occurring from within an operating reciprocating air compressor is an indication of .

compressor overload

motor overload

tight compressor bearings

badly leaking unloaders

136

A thermal expansion valve installed in a refrigeration system is controlled by the action of what device?

the box solenoid valve operating coil

the compressor unloader mechanism

the TEV sensing bulb mounted on the evaporator tail coil

the receiver level controller

137

A thermostatic expansion valve is designed to respond directly to changes in which of the following parameters?

refrigerated space temperature

compressor suction pressure

liquid line temperature

evaporator superheat

138

A thermostatic expansion valve is properly controlling evaporator superheat. Adjusting this valve to lower the evaporator superheat setting will result in which of the following?

the evaporator pressure will decrease

the evaporator feed will increase

the expansion valve will further close

the expansion valve diaphragm will rupture

139

A trainee is on board your vessel and will need to be assessed in the demonstration of practical skills. Ideally you should assess their skill .

before they have received training

immediately after they have received training

after they have observed the skill demonstrated once

after they have received training and personally practiced the skill

140

A two-position single-point action controller has been adjusted to minimize cycling and would only be suitable for .

constant load conditions

intermittent load conditions

wide temperature fluctuations

rate action only

141

A typical shipboard domestic multi-box refrigeration system operates with one compressor and condenser. What is the purpose of the sensing line connected to the thermal bulb at the evaporator coil outlet?

To open or close the solenoid valve when the box temperature increases or decreases.

To open the back- pressure regulating valve when evaporator coil pressure increases.

To direct evaporator outlet pressure to the lower part of the solenoid bellows.

To transmit the bulb pressure (proportional to the coil temperature) to the thermal expansion valve diaphram.

142

A valve attached to line "H" in the illustration, should be opened .

to backflush the pressure vessel with jet air

as a gravity discharge for the fluidized material if the discharge line becomes clogged

to drain moisture and dirt from the bottom of the tank

to precharge the bottom of the pressure vessel with dry nitrogen prior to discharging bulk material

143

A valve connected to the vent line labeled "C" in the illustration should be opened .

when flushing the pressure tank with firemain water

by a pressure relief valve when the pressure exceeds the preset level, usually 42 psig (2.98 kg/cm2)

at all times, except when the tank is pressurized for discharging or aerating the bulk material

when filling the tank or to insure that the tank is not pressurized prior to entering for cleaning and inspection

144

A valve installed in a hydraulic system to control the reversal of fluid flow is called a .

relief valve

reservoir valve

directional control valve

power valve

145

A valve installed in a hydraulic system to manipulate the reversal of fluid flow, is called a .

relief valve

reservoir valve

directional control valve

regenative valve

146

A variable displacement pump is fitted with the illustrated device, the discharge flow rate will be reduced as described by which of the following statements?

Part "H" will move to block the replenishing pump oil flow across part "G" as flow across hydraulic motor decreases.

When part "D" rotates counterclockwise, part "E" will rotate clockwise allowing part "G" to slide towards the set point spring 'F.'

As high side pressure increases part "A", "B", and "C" will work together to reestablish the original tilting box angle.

The increase in high side pressure will gradually increase the tilting box angle of the variable displacement pump.

147

A vertical shaft having a rudder attached to its lower end and having a yoke, quadrant, or tiller fitted to its upper portion by which it may be turned, is the .

rudder frame

rudder post

rudder stock

stern post

148

A viscous film of oil collected between the valve face and seat of a low pressure reciprocating air compressor will .

prevent the valve from wire drawing

retard the opening and closing of the valve

have no effect on compressor operation

provide quieter valve operation

149

A warmer than normal compressor suction line might be caused by what condition?

insufficient lubrication

insufficient refrigerant

excess refrigerant

excessive opening of the expansion valve

150

A water line ruptures under pressure and floods the engine room causing $(USA)30,000 damage to the machinery. By law, this must be reported to the .

engine manufacturer

owner or his agent

U.S. Coast Guard

insurance underwriter

151

A water regulating valve controls the refrigeration condenser cooling water flow in response to what aspect of the condenser?

cooling water inlet temperature

liquid refrigerant outlet temperature

condenser head water pressure

condenser shell refrigerant pressure

152

A welding procedure used for joining dissimilar metals used in the construction of a MODU would be recorded in the .

welding plan

ASTM specifications

construction portfolio

Coast Guard file

153

Aboard tankers, the term Category "A" Machinery Space, as defined by Coast Guard Regulations (46 CFR) means any space including trunks and ducts to that space containing .

internal combustion machinery used for main propulsion

one or more oil fired boilers or oil fuel units

internal combustion machinery used for purposes other than main propulsion where the total collective power is at least 500 brake horsepower

all of the above

154

According to 46 CFR Part 113, what would be the maximum time delay period allowed for a ships steering system to reach a 15 degree right rudder helm order from midships, before an alarm condition will be indicated?

5 seconds

10 seconds

15 seconds

20 seconds

155

According to 46 CFR Part 58, each pressure vessel, which is capable of isolation, containing a refrigerant, must be protected by what means?

subject to annual hydrostatic tests to be performed in the presence of a marine inspector

protected by a relief valve set to relieve at a pressure not exceeding 110 percent of the maximum allowable working pressure of the vessel

stored in an upright position in addition to being secured so as to prevent accidental release of the refrigerant within a confined space

protected by a relief valve set to relieve at a pressure not exceeding the maximum allowable working pressure of the vessel

156

According to 46 CFR Part 58, for protection purposes, what is required of all refrigeration systems?

high pressure cut-out

refrigerant receiver

pressure relief device

low pressure cut-out

157

According to 46 CFR Part 58, when installing a new independent fuel tank for the emergency lighting generator, which of the following statements must be strictly adhered to in accordance with Coast Guard Regulations?

The tank must be located on an open deck or in an adequately ventilated metal compartment in which the ambient temperature never exceeds 150F.

Iron or steel tanks shall be galvanized on the interior to prevent the formation of rust if any condensation should occur.

The fuel tank shall be insulated from the vessel's common ground to insure against static electricity hazards.

All of the above.

158

According to 46 CFR Part 61, what is the maximum allowable permitted wear on a stern tube bushing for a vessel that has its propelling machinery located amidships, with a water lubricated stern tube bearing carrying a 12 inch diameter shaft ?

1/4 inch

5/16 inch

3/8 inch

1/2 inch

159

According to 46 CFR Part 61, which of the following machinery remote control shutdowns is/are required to be tested during each regular inspection for certification?

Forced draft fan

Induced draft fan

Fuel oil transfer pump

All of the above

160

According to 46 CFR Part 91, a temporary Certificate of Inspection, Form CG-854, may be issued to a self propelled cargo vessel .

when the immediate issuance of a Certificate of Inspection is not possible at the completion of an inspection

until all minor deficiencies (CG-835's) found by the CG inspector during a biannual inspection are corrected, at which time a regular certificate may be issued

to cover an expired permanent Certificate of Inspection provided that the certificate did not expire within 15 days after the vessel left the last port of the U. S.

under all of the above situations

161

According to 46 CFR Part 91, which of the following statements concerning a vessel's Coast Guard Certificate of Inspection and associated inspections is correct?

Application may be made for inspection and issuance of a new Certificate of Inspection at any time during the period of validity of the current Certificate.

To prevent any delay, a temporary Certificate of Inspection may be issued pending delivery of the regular Certificate of Inspection upon completion of the inspection.

A reinspection of a vessel holding a valid two year Certificate of Inspection is normally conducted between the tenth and fourteenth months of inspection date.

All of the above.

162

According to 46 CFR Subpart 61.20 regarding the periodic tests of machinery and equipment, what is the maximum tail shaft to stern tube bearing clearance (at the after end of the stern tube) that would require rebushing for a vessel in ocean service, with an aft propulsion machinery space, a 14" diameter tail shaft, and a water lubricated stern tube bearing constructed of material other than rubber?

0.25

0.3125

0.374

0.4375

163

According to 46 CFR, a cargo hatch fluid-power operating system is considered to be fail-safe if a component failure will result in .

continuous operation of the system

a safety interlock producing a regulated shutdown of the system

the guaranteed safe and efficient operation of the system at all times

a slow and controlled release of the loading so as not to endanger personnel

164

According to 46 CFR, the tailshafts of a twin screw ocean going vessel must be examined and inspected in the presence of a marine inspector .

each time the vessel is drydocked

at least twice every five years

at every annual inspection

at least once every five years

165

According to 46 CFR, the tailshafts of a twin screw ocean going vessel must be examined and inspected in the presence of a marine inspector .

each time the vessel is drydocked

at least twice every five years

at every annual inspection

at least once every five years

166

According to 46 CFRs, the master of a commercial vessel is required to submit a marine casualty report form CG 2692 to the nearest Coast Guard Marine Safety Office if .

damage to the vessel due to a collision is estimated between $15,000 and $20,000

the vessel was intentionally grounded because the bilge pumps were unable to maintain normal levels

a crewmember was placed on light duty for two days due to a sprained wrist and was required to wear a sling

all of the above

167

According to 46 CFRs, when estimating the cost of collision damage to a tank vessel after a marine accident, which of the following should NOT be included in the repair cost estimate?

Cost to off-load the current cargo

Cost to gas-free the cargo tanks

Cost to drydock the vessel

All of the above

168

According to Coast Guard regulation (46 CFR), a "C" class division, bulkhead or deck shall be constructed .

with approved incombustible materials and made intact from deck to deck and to shell or other boundaries

of approved incombustible materials, but need meet no requirements relative to the passage of flame

that if subjected to the standard fire test, they would be capable of preventing the passage of flame for one half hour

that if subjected to the standards fire test, they would be capable of preventing the passage of flame or smoke for one hour

169

According to Coast Guard regulation (46 CFR), an "A" class division, bulkhead or deck shall be constructed .

with approved incombustible materials and made intact from deck to deck and to shell or other boundaries

of approved incombustible materials, but need meet no requirements relative to the passage of flame

that if subjected to the standard fire test, they would be capable of preventing the passage of flame for one half hour

that if subjected to the standard fire test, they would be capable of preventing the passage of flame and smoke for one hour

170

According to Coast Guard Regulations (46 CFR Part 58), a power driven auxiliary steering gear for a vessel capable of a 12 knot service speed, must be able to meet the rudder movement requirements at which of the minimum vessel speeds listed below?

6 knots

7 knots

9 knots

12 knots

171

According to Coast Guard regulations (46 CFR Part 92), a standard fire test is one .

of many initial operating tests performed on newly commissioned boilers

which is used to determine the flash point of various marine fuels

which develops a series of time temperature relationships in a test furnace

in which all emergency firefighting and related safety equipment are tested

172

According to Coast Guard Regulations (46 CFR) an accumulator is a/an .

device in which bilge water may be stored prior to being pumped ashore

unfired pressure vessel in which energy is stored under high pressure in the form of a gas or a gas and a hydraulic fluid.

industry accepted term for the equipment which is used to collect oily bilge liquids

test procedure in which the relieving capacity of the safety valves are verified

173

According to Coast Guard regulations (46 CFR) lamp, paint and oil lockers, and similar compartments shall .

suitably insulated from any woodwork or other combustible matter

be constructed of steel or shall be wholly lined with metal

not be located at the end of a corridor in excess of forty feet in length

be so arranged to prevent excessive movement of its contents during periods of foul weather

174

According to Coast Guard Regulations (46 CFR), all pressure vessels other than unfired steam boilers shall be protected by pressure-relieving devices that prevent the pressure from rising more than above the maximum allowable working pressure.

5 percent

10 percent

15 percent

20 percent

175

According to Coast Guard regulations (46 CFR), a "B" class bulkhead shall be constructed .

of steel or equivalent metal construction, suitably stiffened and made intact from deck to deck and to shell or other boundaries

of approved incombustible materials, but need meet no requirements relative to the passage of flame

that if subjected to a standard fire test, they would be capable of preventing the passage of flame for one half hour

that if subjected to the standard fire test, they would be capable of preventing the passage of flame and smoke for one hour

176

According to Coast Guard Regulations (46 CFR), a power driven auxiliary steering gear for a vessel capable of a 20 knot service speed, must be capable of producing a specific range of rudder movement at which of the minimum speeds listed below?

7 knots

10 knots

15 knots

20 knots

177

According to Coast Guard Regulations (46 CFR), a single steel hull cargo vessel operating exclusively in freshwater, shall be drydocked, or hauled out, at intervals not to exceed .

1 year

2 years

3 years

5 years

178

According to Coast Guard Regulations (46 CFR), a welded repair to be made to a ships service air receiver, other than an emergency repair at sea, must be .

inspected and tested by the chief engineer before it may be returned to service

completed and then tested at least twice prior to notifying the Coast Guard to ask for a marine inspector

made with a backing strip to ensure full penetration

made only with the prior approval of the local Officer in Charge, Marine Inspection (OCMI)

179

According to Coast Guard Regulations (46 CFR), which of the following statements is correct regarding the steering apparatus requirements for a vessel over 250 feet in length?

Hydraulic structural rudder stops are mandatory.

On hydraulic type steering gears, a suitable arrangement of check valves in the main piping system may be considered as a means of steadying the rudder.

A separate auxiliary means of steering is not required where the main gear is of the dual power hydraulic type, having two independent pumps and connections.

All of the above.

180

According to Coast Guard Regulations, flexible hoses used as supply and return lines to hydraulic system components, must have .

the working pressure of the system stamped on one of the end fittings

the working pressure of the system stamped on both of the end fittings

an inner tube constructed of seamless reinforced polyester braid

a designed bursting pressure of at least four times the maximum working pressure of the system

181

According to Coast Guard Regulations, if a pressure vessel, such as a ships service air tank, has defects which may impair its safety, the tank shall be .

hydrostatically tested at a pressure equal to the design pressure of the tank

hydrostatically tested at a pressure equal to 1 1/2 times the maximum allowable working pressure of the tank

pneumatically tested at a pressure equal to the working pressure of the tank

pneumatically tested at a pressure equal to 1 1/2 times the design pressure of the tank

182

According to regulations (46 CFR Part 58), a boiler combustion control system may be tested at .

a pressure not less than 1.25 times the maximum allowable working pressure

a pressure not less than 1.5 times the maximum allowable working pressure

the maximum allowable working pressure of the system

the normal operating pressure of the system provided full loading is accomplished

183

According to regulations (46 CFR), who may grant an extension of the tailshaft examination interval?

Officer in Charge, Marine Inspection office

Commandant CG 543

Authorized Representative of the American Bureau of Shipping

Official Representative of the Naval Pollution Control Office

184

According to the data provided in the illustrated table, if the low side saturation temperature is maintained at -15F and the high side saturation temperature is maintained at 100F, what is the compression ratio of the system's compressor?

8.81 to 1

9.43 to 1

123.6 to 1

The compression ratio cannot be calculated from this data

185

According to the data provided in the illustrated table, if the low side saturation temperature is maintained at 5F and the high side saturation temperature is maintained at 86F, what is the compression ratio of the system's compressor?

4.68 to 1

10.65 to 1

17.2 to 1

The compression ratio cannot be calculated from this data

186

According to the EPA Clean Air Act rules, what is true concerning refrigerant leaks in a small hermetically sealed shipboard water cooler with a 20 ounce charge weight?

The leaks must be repaired within 30 days.

The leaks must be repaired if the annual leak rate exceeds 35% of the total charge.

The leaks must be repaired if the annual leak rate exceeds 15% of the total charge

Legally, the leaks are not required to be repaired, but morally it is advisable to repair the leaks.

187

According to the illustration shown, which of the following statements is/are true?

If port "C" became obstructed or plugged, the outlet pressure would tend to decrease.

If port "J" became obstructed or plugged, the outlet pressure would tend to decrease.

If auxiliary valve "D" developed a considerable leak, the outlet pressure would tend to decrease.

all of the above

188

According to the illustration shown, which of the following statements is/are true?

If port "C" became obstructed or plugged, the outlet pressure would tend to decrease.

If port "J" became obstructed or plugged, the outlet pressure would tend to increase.

If auxiliary valve "D" developed a considerable leak, the outlet pressure would tend to increase.

all of the above

189

According to the regulations for mobile offshore drilling units, 'industrial personnel' are considered to be all persons carried on the MODU for the sole purpose of carrying out the industrial business of the unit, except for .

the operator's representative

the crew required by the Certificate of Inspection

the galley personnel

the designated person in charge

190

According to the Regulations, all escape hatches and other emergency exits on small passenger vessels of less than 100 gross tons shall be marked on .

exterior side, in less than 2-inch letters 'watertight opening- keep clear'

exterior side only, in at least 2-inch letters 'emergency exit-keep clear'

both sides, in at least 2- inch letters 'watertight door-close in emergency'

both sides, in at least 2- inch letters 'emergency exit-keep clear'

191

According to Title 33 CFR, of the equipment listed below, which equipment must be tested NOT more than 12 hours prior to getting underway from a U.S. port when the voyage is to be of 48 hours or greater duration?

Steering gear

Emergency generator

All internal vessel control communications systems

All of the above

192

According to Title 46 CFR, of the equipment listed below, which equipment must be tested NOT more than 12 hours prior to getting underway from a U.S. port when the voyage is to be of 48 hours or greater duration?

Steering gear

Shaft generator

All external vessel control communications and alarms

All of the above

193

According to U.S. Coast Guard Regulations (46 CFR Part 32), when reach rods to tank valves pass through the deck, the stuffing box at this joint must be .

grounded with bonding straps

water tight

gas tight

made of nylon or other nonmetallic material

194

According to U.S. Coast Guard Regulations (46 CFR Part 92), how many means of escape must be provided in spaces where the crew may be quartered or employed?

Two, both of which must be through watertight doors.

Two, both of which are located as close together as possible to centralize escape routes.

Two, at least one of which shall be independent of watertight doors.

Two, both of which must be vertical ladders terminating in locked watertight scuttles.

195

According to USCG regulations pertaining to cargo and miscellaneous vessels, on all vessels equipped with ammonia refrigeration units to refrigerate cargo spaces, for protection against refrigerants, what is required?

a self-contained breathing apparatus must be provided for use as protection against gas leaking from the refigeration unit if the refrigerated spaces exceed a volume of 20 cubic feet

a self-contained breathing apparatus must be provided for use as protection against gas leaking from the refigeration unit if the refrigerated spaces exceed a volume of 1000 cubic feet

a gas mask must be provided for use as protection against gas leaking from the refigeration unit if the refrigerated spaces exceed a volume of 20 cubic feet

a gas mask must be provided for use as protection against gas leaking from the refigeration unit if the refrigerated spaces exceed a volume of 1000 cubic feet

196

Admitting steam to an improperly drained heating system could result in .

cutting valve seating surfaces

high velocity slugs of water in motion in the system

damage due to water hammer

all of the above

197

After conducting a boat drill on a mobile offshore drilling unit, which of the following is the master or person in charge required to enter into the logbook?

The condition of the equipment used during the drill.

The name of the lifeboatman in charge of each lifeboat.

The location of the vessel at the time of the drill.

The time it took to lower the boat.

198

After conducting a boat drill, the master or person in charge of MODU shall log .

the names of crew members who participated in the drill

the length of time that each motor propelled lifeboat was operated in the drill

the length of time the lifeboat was in the water

the time it took to lower the boat

199

After disassembly, the safest way to remove carbon deposits from air compressor inlet and discharge valves is to use .

ammonia

diesel oil

gasoline

naphtha

200

After installing a new hydraulic pump in a system, what special attention should be given to the hydraulic system?

The relief valves in the system should be readjusted.

The filters and strainers should be checked frequently.

System return pressure should be readjusted.

The system should be drained and renewed with a fluid of different operating characteristics.

201

After installing a new hydraulic pump in a system, what special attention should be given to the hydraulic system?

The relief valves in the system should be readjusted.

The filters and strainers should be checked frequently.

All system pressure should be readjusted.

The system should be drained and renewed with a fluid of different operating characteristics.

202

Aftercoolers are used with air compressors to .

reduce the temperature of compressed air

decrease the density of compressed air

dampen pressure pulses in the discharge air

ensure complete expansion of the compressed air

203

Air blowing from the intake air filter of an operating air compressor indicates .

broken inlet valves

broken discharge valves

pulsations in the air distribution system

overloading of the air distribution system

204

Air compressor cylinder unloaders enable the compressor to .

vary their speed according to temperature and load

start and come up to speed before air compression begins

change speed according to overload demands

reduce compressed air charge density

205

Air compressor receivers should be 'blown down' at least .

yearly

quarterly

monthly

daily

206

Air compressors are equipped with unloading systems for the purpose of .

removing all but the frictional load during starting

relieving intercoolers of high temperature buildups

providing high starting torque in the drive motor

seating valve plates during compressor shutdown

207

Air entering an air-cooled refrigeration system is indicated by what operating symptom?

frosting of the liquid line

higher than normal head pressure

a clear sight glass

abnormally cold reefer boxes

208

Air entrained in the hydraulic fluid, or trapped in an actuator will cause the actuators to move with a jerky motion. This action is a result of .

the trapped air being compressed to a pressure above the maximum pump discharge pressure, then re-expanding and lowering in pressure after the actuator moves

the cyclic expansion and contraction of air due to the motion of the actuator

air being capable of moving loads more effectively than a liquid

air providing better lubrication of internal components, found in Hydraulic Systems, than hydraulic fluids

209

Air entrained in the hydraulic fluid, or trapped in an actuator will cause the actuators to move with a jerky motion. This action is a result of .

the trapped air being compressed to a pressure above the maximum pump discharge pressure, then re-expanding and lowering in pressure after the actuator moves

the trapped air being compressed to operating system pressure, then dropping in pressure as the actuator moves, allowing the air to re- expand, then repeating the process

air being capable of moving loads more effectively than a liquid

air providing better lubrication of internal components, found in Hydraulic Systems, than hydraulic fluids

210

Air line lubricators are used in compressed air systems to lubricate .

the suction and discharge valves

tools and equipment served by compressed air

air line reducing valves

all of the above

211

Air trapped in a refrigeration system using a water-cooled condenser is usually indicated by what operating symptom?

unusually high head pressure when compared to the existing temperature of the liquid refrigerant

higher than normal liquid level in the receiver

unusually lower than normal discharge pressure when compared to the existing temperature of the liquid refrigerant

higher than normal liquid refrigerant temperature

212

Air trapped in one end of a hydraulic actuator may be indicated by .

erratic or jerky motion of the actuator

a pump discharge pressure that is consistent, but higher than normal

consistently faster response or movement of the actuator

over speeding of the pump

213

Air trapped in the hydraulic fluid of a steering system may be indicated by .

the steering pumps overspeeding

a jammed open relief valve

a constantly occurring improper rudder response

excessive ram pressure

214

Air trapped in the hydraulic fluid of a steering system should be indicated by .

the pump overspeeding

an improper rudder response

bubbles in the sight glass

ram relief valves lifting

215

Air trapped in the hydraulic fluid of a steering system would be indicated by .

an improper rudder response

hammering noises in the equipment or transmission lines

popping or sputtering noises

all the above

216

Alkylbenzene ISO 32 cSt synthetic refrigerant oil is miscible and suitable to use with which of the following refrigerants?

R-22

R-32

R-134a

R-143a

217

All of the links in the last shot of anchor chain are painted .

yellow

white

red

orange

218

All of the links in the next to the last inboard shot of chain are painted .

yellow

white

red

orange

219

All shipboard personnel responsible for the maintenance and repair of air conditioning systems using refrigerants covered under the EPA Clean Air Act venting prohibition, must be certified through an approved Enviromental Protection Agency (EPA) program to do which of the following?

before they can pump down the system in preparation for shifting over to the standby condensing unit

before they can set the operating controls of the system

before performing maintenance, service or repair that could reasonably be expected to release Class 1 or Class 2 refrigerants into the atmosphere

before performing any maintenance or repair regardless of the actual procedure

220

All watertight doors and watertight hatches on small passenger vessels of less than 100 gross tons are required to be marked in letters .

of at least 1-inch, 'watertight door-close in an emergency' or 'watertight hatch-close in emergency'

not to exceed 1-inch 'watertight door-close in emergency' or 'watertight hatch-close in emergency'

of at least 1-inch, 'emergency exit, keep clear'

not to exceed 1-inch, 'emergency exit, keep clear'

221

Ammonia when used as a refrigerant is valuable because of its high efficiency, due to its high latent heat of vaporization value. It is, however, a hazardous substance. Which of the following properties is associated with ammonia?

toxic

flammable

explosive

all of the above

222

Among the illustrated service valves, which service valve is represented as fully back-seated?

A

B

C

D

223

Among the illustrated service valves, which service valve is represented as fully front-seated?

A

B

C

D

224

An air compressor can be unloaded at start-up by .

holding the discharge valve open

relieving the intercooler pressure to the atmosphere

using an enlarged, permanently opened clearance expansion space

a precharged accumulator

225

An air compressor is equipped with an intercooler and an aftercooler to .

inject water vapor into the compressed air

prevent overheating of first stage valves

increase compressor efficiency and economy

reduce the compressed air charge density

226

An air compressor is equipped with an intercooler to . I. increase the efficiency of the compressor II. reduce the low pressure cylinder designed operating temperature

I only

II only

Both I and II

Neither I nor II

227

An air conditioning system, required to remove from 33,000 to 35,000 BTU per hour, should have a minimum capacity of what tonnage?

1.5 tons

2.0 tons

2.5 tons

3.0 tons

228

An air tank rusts out, explodes and causes $(USA) 24,000 damage to the engine room. By law, this accident is required to be reported to .

the owner or his agent

the insurance underwriter

no one

the U.S. Coast Guard

229

An air tank rusts out, explodes, and causes in excess of $(USA)25,000 damage to the engine room. By law according to 46 CFR Part 4, this accident must be reported to the .

owner or his agent

insurance underwriter

air tank underwriter

U.S. Coast Guard

230

An ammonia leak will turn moistened pink litmus paper to what color?

orange

red

purple

blue

231

An arrow stamped on the valve body of a water regulating valve indicates which of the following?

direction of the plunger slide

closed position

open position

direction of the flow

232

An arrow superimposed on a hydraulic graphic symbol at approximately 45, as shown in the illustrated figures A, B, and C, indicates the component .

is pilot controlled

is pressure compensated

can be adjusted or varied

allows flow in one direction only

233

An automatic temperature controller, with a net output pressure of 15 psi and a full scale range of 15F, would have a sensitivity ratio of .

1.0 psi/F

3.9 psi/F

10.0 psi/F

12.25 psi/F

234

An axial piston hydraulic motor is caused to rotate by fluid flow from a comparably designed variable displacement pump fitted with the illustrated device. If the motor stalls, due to excess load, the pump tilting box will seek neutral stroke until the high side pressure equalizes or is less than the set point pressure established by part .

A

E

I

J

235

An axial piston pump differs from a radial piston pump as the pistons of an axial piston pump are positioned .

radially from the shaft

parallel to each other and to the shaft

parallel to each other but at a right angle to the shaft

at an angle to each other and to the shaft

236

An axial piston, variable stroke pump is used in a vessel's hydraulic steering gear. Under pressure, the oil leakoff from between the valve plate and cylinder barrel will .

cause loss of hydraulic oil from the system

result in extreme damage to the pump

cause damage to the pump if not continually drained from the pump casing

result in the system low side pressure to substantially drop off

237

An economizer, or heat interchanger, is installed in a refrigeration system for what purpose?

reduce the possibility of sweating of the suction line

reduce the temperature of liquid refrigerant prior to entering the expansion valve

reduce the possibility of liquid refrigerant flooding back to the compressor

all of the above

238

An electric driven steering gear power unit is required by Coast Guard Regulations (46 CFR) to be capable of putting the rudder over from 15 on one side to 15 on the other side in not more than 60 seconds under emergency power with the vessel running ahead. For a 20 knot vessel, this test must be carried out at .

7 knots

10 knots

15 knots

20 knots

239

An electric power failure occurring in a electro-hydraulic steering gear would cause the rudder to .

automatically swing 35 right or left

remain locked in its last position

automatically shift to the midship position

jam against the rudder emergency stops

240

An evaporator coil of a single evaporator, air cooled refrigerator is accumulating excessive frost due to a failure of the defrost mechanism. If the refrigerator features a thermostatically controlled box solenoid and a low pressure cutout controlled compressor, as well as a high pressure cutout, in terms of the compressor, what would be the most likely operating symptom?

run continuously

short cycle on low pressure cutout

short cycle on high pressure cutout

fail to start

241

An evaporator pressure regulating valve (back pressure regulator) is installed in the evaporator coils of some refrigeration systems for what purpose?

prevent compressor overload

maintain at least a minimum evaporator pressure

control liquid refrigerant pressure

regulate refrigerant outlet superheat

242

An excessive amount of water is prevented from entering a vessel using a water lubricated stern tube bearing by the use of the .

propeller hub

lignum vitae

shaft packing

labyrinth seal

243

An excessive charge of refrigerant in a thermostatically controlled, air-cooled, refrigeration system using a TXV as an expansion device can cause which of the following?

oil foaming in the compressor

lower than normal box temperature

higher than normal discharge pressure

the compressor to run continuously

244

An important point of consideration when replacing a dry type intake filter on an air compressor is to .

use the same wetting oil on the element as is used in the compressor lubrication system

install a smaller size filter to allow for expansion of the element

install only a filter consisting of a treated paper element

select the proper size filter so that air flow is not restricted

245

An improperly maintained filter used in a hydraulic system can .

reduce or stop the output action of the actuator

cause leaking of the flexible line connections

rupture the pump discharge piping

all of the above

246

An increase in the heat load subjected to a refrigeration system will cause what to happen?

the compressor suction pressure to decrease

the compressor suction pressure to increase

increased ice formation on the evaporator coil

excessive short cycling of the compressor

247

An increasing head pressure in a refrigeration system, without any corresponding change in the cooling water inlet temperature, would probably be caused by which of the following?

restriction in refrigerant piping associated with the liquid line

air and noncondensable gases in the condenser

water in the refrigerant

flooding back of liquid refrigerant to the compressor from the evaporator

248

An internal bypass is provided on some hydraulic system suction strainers to help reduce the possibility of .

aeration of the oil

contamination of the oil

pump cavitation

spongy actuator movements

249

An international and coastwise load line assignment and certificate has been issued to a vessel by the American Bureau of Shipping, under the authority of Coast Guard Regulations (46 CFR), for a period of .

1 year

2 years

4 years

5 years

250

An obstructed expansion valve may be indicated by an incompletely cooled evaporator and what other symptom?

a higher than normal discharge pressure

frosting at the evaporator inlet

a decrease in the amount of frosting across the drier

frosting at the suction side of the compressor

251

An oil separator is a device used to remove oil from which of the following?

hot suction gas

warm high pressure liquid

hot discharge gas

cold discharge gas

252

An orifice-check valve placed in a hydraulic system is used to .

regulate the fluid flow in either direction

restrict movement of hydraulic fluid in one direction, but allow free movement in the other direction

allow free movement of hydraulic fluid in both directions

allows only a restricted fluid flow in one direction

253

An O-ring seal in a hydraulic system will begin to leak when it has lost its interference fit due to .

compression set or wear

low fluid pressure

high fluid flow

low fluid temperature

254

An unloader is installed on an air compressor to .

bypass the high pressure stage to the intercooler

prevent excessive interstage pressure buildup

control compressor discharge pressure

remove the compression load as the compressor comes up to speed during starting

255

An unloader is installed on an air compressor to .

bypass the high pressure stage to the low pressure stage on 100% of the air compressors in service

prevent excessive interstage pressure buildup

control compressor discharge pressure

remove all but the frictional load during starting

256

An untagged refrigerant cylinder is found in your storage area. Since it is color coded light (sky) blue, what refrigerant is contained within?

CFC-12

CFC-11

HCFC-22

HFC-134a

257

An unusual degree of refrigeration system compressor crankcase sweating is an indication of what possible condition?

insufficient lube oil circulating through the system

excessive circulation of lube oil through the system

insufficient refrigerant in the system

an overworked compressor

258

Any air mixture whose dew point remains constant will also have another unchanging property. Which of the following properties will remain unchanged?

dry bulb temperature

wet bulb temperature

specific humidity

specific volume

259

Any noncondensable gases in a TXV controlled refrigeration system will eventually accumulate in the top of the system condenser. What condition does this cause?

decrease in the low side pressure

increase in the high side pressure

decrease in the high side pressure

increase in the low side pressure

260

Any restriction in the instrument air piping of a pneumatic control system will .

delay transmission of the air signal

increase the transmitted air signal intensity

reduce the transmitted air signal value

accelerate transmission of the air signal

261

Any unusual, or new vibration in the hull or propeller shafting can be an indication of .

clutch slippage

overheated bearings

high engine speeds

propeller unbalance

262

As a general rule of thumb, the reservoir used in a hydraulic system should have a capacity, when at the normal level, approximately equal to .

two to three times the normal flow rate through the system

the flow rate through the system

ten times the flow rate through the system

the pump gpm

263

As a rule of thumb, when pressure is applied to hydraulic oil, the oil will .

not be compressed, as liquids are not compressible

reduce in volume by 1% for every 100 psi increment

increase in volume by 1% for every 1,000 psi increment

reduce in volume by 1/2% for every 1,000 psi increment

264

As a watchstander you should know that some auxiliaries are not designed to handle steam at boiler pressure. Which of the devices listed is usually fitted in the branch line to deliver steam at the correct pressure?

An orifice

A steam pressure reducing valve

A nozzle valve

A constant quantity regulating valve

265

As compared to the temperature maintenance period when the box temperatures are within normal operating range, the beginning of a temperature pull-down period after loading stores of a multibox refrigeration system, the operating conditions of the system would require the flow rate of refrigerant circulating in the system and the suction pressure to do what?

remain the same, with a decrease in suction pressure

increase, while maintaining the normal suction pressure

remain the same with an increase in suction pressure

increase, with an increase in suction pressure

266

As demand on the device shown in the illustration fluctuates in the pressure range of 100 to 110 psi, the output of the unit is controlled by .

complete shut down until the lower pressure limit is reached causing it to restart

the modulation of the opening of a butterfly valve located in the air intake

change in control pressure to modulate the discharge of compressed air to the atmosphere

proportional modulation of the compressor speed

267

As flowing through the valves labeled "26" and "34" in the illustrated refrigeration plant schematic diagram, what is the status of the refrigerant?

low pressure gas

low pressure liquid

high pressure gas

high pressure liquid

268

As showin the illustrated R-134a high pressure centrifugal chiller lubricating oil circuit, what is statement is true concerning the eductor?

the eductor uses oil from the lube oil pump discharge as a working fluid, pulling a suction on the inlet guide vanes drain sump and discharging to the main lube oil sump

the eductor uses gas from the compressor discharge as a working fluid, pulling a suction on the inlet guide vanes drain sump and discharging to the main lube oil sump

the eductor uses oil from the lube oil pump discharge as a working fluid, pulling a suction on the main lube oil sump and discharging to the inlet guide vanes drain sump

the eductor uses gas from the compressor discharge as a working fluid, pulling a suction on the main lube oil sump and discharging to the inlet guide vanes drain sump

269

As shown in the illustrated multi-evaporator refrigeration system, through what labeled valve would the refrigerant temperature be the highest?

"9"

"16"

"18"

"20"

270

As shown in the illustrated multi-evaporator refrigeration system, through what labeled valve would the refrigerant temperature be the lowest?

16

18

20

32

271

As shown in the illustration, the gage labeled "C" contains mercury and both devices "B" and "D" indicate 'zero' units when exposed to atmospheric pressure. If the pressure indicated on "A" is 16.2 psia, the corresponding readings of the gages "B", and "D", and the height "H" for device "C" should be .

B = 2.1 psig, D = 450" H2O, h = 3"

B = 40.9 psig, D = 450" H2O, h = 3"

B = 1.5 psig, D = 41.59" H2O, h = 3"

B = 2.1 psig, D = 42" H2O, h = 6"

272

As shown the illustrated water-cooled rotary chiller refrigerant flow and lubricating oil circuits, what is the functional purpose of the economizer? I. Provide a cooling medium for the hermetic motor windings II. Improve the overall efficiency of the plant

I only

II only

Both I and II

Neither I nor II

273

As shown the illustrated water-cooled rotary chiller refrigerant flow and lubricating oil circuits, which of the listed thermistors is used as a sensor for the capacity control system loader solenoid valves?

suction gas thermistor

discharge gas thermistor

chilled water inlet thermistor

chilled water outlet thermistor

274

As shown the illustrated water-cooled rotary chiller refrigerant flow and lubricating oil circuits, which of the listed thermistors is used as a sensor for the electronic control circuit for the electronic expansion valve?

suction gas thermistor

discharge gas thermistor

chilled water inlet thermistor

chilled water outlet thermistor

275

As shown the illustrated water-cooled rotary chiller refrigerant flow and lubricating oil circuits, which of the listed transducers are used as a sensors for determining pressure differential in controlling the operation of the oil pump?

discharge pressure and suction pressure transducers

oil pressure and economizer pressure transducers

oil pressure and suction pressure transducers

discharge pressure and oil pressure transducers

276

As the amount of moisture in the air increases, what will happen to the difference between the dry bulb and wet bulb temperatures?

increase

decrease

remain unchanged

be greatest at dew point

277

Assuming valve "A" is correctly aligned in the no-flow position as shown with the system in operation, which of the following statements is true?

The fixed delivery pump would be stopped automatically by a pressure switch.

Valve "B" would be open before valve "D".

Valve "C" would be closed.

Valve "D" would normally open before valve "B".

278

At ambient temperature and atmospheric pressure, what is the status of R-134a?

corrosive liquid

subcooled gas

odorless gas

superheated liquid

279

At which of the following locations would a duplex pressure gage most likely be located?

Fuel oil service pump discharge flange

Fuel oil strainer

Fuel oil heater

Fuel oil flow meter

280

Automatic pressure control valves for steam service require periodic maintenance inspections because they .

are subjected to high compressive stress

are subjected to a wide range of temperatures and pressures

continuously throttle steam which results in wire drawing and erosion of the valve

receive high pressure air from the pilot valve

281

Automatic thermostatic control valves are used in steam- heated heavy fuel oil service systems for what purpose?

maintenance of double bottom heavy fuel oil storage tank temperature

maintenance of fuel delivery temperature to boiler or diesel engine supply header as appropriate

maintenance of fuel delivery pressure to boiler or diesel engine fuel oil supply header as appropriate

maintenance of steam temperature supplying steam tracing lines for heavy fuel oil

282

Badly leaking refrigeration compressor discharge valves will cause which of the following to happen?

overfeeding of the expansion valve

damage to the condenser

constant running of the compressor

flooding of the receiver

283

Before charging a refrigeration unit, unless quick disconnect fittings are used, the refrigerant charging hoses should be prepared in what way?

they should be flushed with clean refrigerant oil

they should be purged with refrigerant

they should be cleaned with carbon tetrachloride

they should be warmed in an oven

284

Before doing any work on a hydraulic system equipped with accumulators, you should .

drain the accumulators and purge with oxygen

bleed off all stored energy from the accumulators

completely charge the accumulators to prevent system energy loss

pump the hydraulic fluid into the accumulators to prevent fluid loss

285

Before performing any maintenance on a hydraulic system storing energy in an accumulator, you should .

pressurize the system to test for leaks

bleed off all pressure within the system

operate the machine until it reaches normal temperature

disconnect the pump pressure control switch

286

Before setting out on a three day voyage, Coast Guard Regulations require that the steering gear, whistle, and communications system between the bridge and engine room must be tested within how many hours prior to departure?

1 hour

4 hours

8 hours

12 hours

287

Besides the evaporator pressure, the thermal expansion valve reacts directly to changes in what parameter?

temperature of the space being cooled

liquid refrigerant pressure at the solenoid valve

pressure drop across the evaporator coils

temperature of the evaporator coil outlet

288

Between the side frames of a MODU, support for the deck beams is provided by .

stanchions

brackets

web frames

deck stringers

289

Biasing, in a pneumatic automated combustion control system, refers to a set amount of increase or decrease in the .

control pressure

loading pressure

supply pressure

rate relay pressure

290

Both the direction of flow and fluid flow rate of a variable displacement radial piston pump are determined by the relative positions of the .

pump shaft and central valve

pump shaft and horizontal ports

floating ring and pump shaft

floating ring and cylinder body

291

Broken valve strips in an operating low pressure air compressor will cause .

an immediate crankcase explosion

oil contamination in the compressed air

a decrease in compressor capacity

no immediate loss of the compressed air capacity

292

Bulkheads forming part of the tanks on a MODU are stiffened to withstand .

deck loads from above

dynamic forces while afloat

hydrostatic pressure

overpressurization

293

By which of the following means is force efficiently provided to vary the pitch of the blades on a modern controllable pitch propeller?

Hydraulic

Mechanical

Pneumatic

Electrical

294

Capacity control of a centrifugal refrigeration compressor can be accomplished by what means?

varying the speed of the compressor

varying the position of the suction inlet damper vanes

varying the position of the hot gas bypass valve

all of the above

295

Carbon deposits forming on the discharge valves of an air compressor are caused by oil deterioration under high pressure. The first step in reducing these deposits would be to .

reduce the discharge temperatures with intercoolers

increase the compression ratio

use a high viscosity oil

increase the oil volatility

296

Cavitation in a hydraulic pump is .

the compression and collapse of vapor bubbles in the pump internal components

caused by pitting of the pump internals due to galvanic action

caused by pitting of the pump internals due to operation with acidic oil

a result of a clogged discharge filter

297

Cavitation in a hydraulic pump is indicated by noisy pump operation and can be caused by a/an .

high fluid level in the reservoir

hydraulic fluid low floc point

excessive discharge pressure from the pump

clogged suction strainer in the reservoir

298

Certificates of Inspection for offshore drilling units are issued for a period of .

24 months

36 months

48 months

60 months

299

CFC refrigerants exposed to high temperature or direct flame, will decompose and may produce what chemical substance?

methyl chloride

ammonia

hydrofluoric acid

ozone

300

Charging liquid HCFC-123 into a system under a deep vacuum could cause what to happen unless necessary precautions are taken?

the purge unit to operate

system secondary refrigerant to freeze

air and moisture to enter the reciever

rupture disk to rupture

301

Coast Guard Regulations (46 CFR) require that electric and electro-hydraulic steering gear motors shall be .

served by two electric power feeder circuits

provided with a motor running overcurrent protection device

protected by a circuit breaker and a thermal overload device

served by a single two conductor cable

302

Coast Guard Regulations (46 CFR) concerning shutoff valves located inside fuel oil tanks, state that the valves .

shall be arranged for local control

must be made of steel

must be power operated

may be made of cast iron

303

Coast Guard Regulations (46 CFR) define several acceptable means of closure for ballast and fuel oil tank vents. One of the acceptable means is by the use of a/an .

manually operated ball check valve

automatically operated hinged closure

permanently installed canvas hood

corrosion resistant wire screen

304

Coast Guard Regulations (46 CFR) permit the interval required for drawing certain tailshafts to be extended by the .

Vessel Operator's senior Port Engineer

Senior ABS surveyor

Commandat (G-MOC)

U.S. Maritime Administration

305

Coast Guard Regulations (46 CFR) prohibit air compressors from being located in .

a space within three meters of a cargo valve

a space in which cargo hose is stowed

an enclosed space containing cargo piping

all of the above

306

Coast Guard Regulations (46 CFR) require a method for the relieving pressure of an over pressurized refrigeration system. Which of the following statements complies with these regulations?

The relief valve from the receiver must relieve to the condenser first.

The relief valve settings shall be 1 1/4 times the maximum allowable working pressure.

A rupture disk may be fitted in series with the relief valve.

The rupture disk shall burst at a pressure not higher than 10% above the relief valve setting.

307

Coast Guard Regulations (46 CFR) require a single tail shaft with water lubricated tail shaft bearings, stress-relieved keyway, and fabricated from materials resistant to corrosion by sea water, to be drawn and examined once in every .

2 years

3 years

5 years

8 years

308

Coast Guard Regulations (46 CFR) require an audible and visible alarm to be actuated in the pilothouse when the actual position of the rudder differs from the position ordered by the follow-up control system by 5 degrees or more for more than .

30 seconds for ordered rudder position changes of 70 degrees

16 seconds for ordered rudder position changes of 5 degrees

10 seconds for ordered rudder position changes of 2.5 degrees

all of the above

309

Coast Guard Regulations (46 CFR) require hydraulic steering gear systems to be equipped with a means of steadying the rudder in an emergency. This may be accomplished with .

a suitable arrangement of stop valves in the main piping

a positive arrangement for stopping the rudder before the rudder stops are reached

a suitable arrangement of block and tackle powered by winches

buffer arrangements to relieve the gear from shocks to the rudder

310

Coast Guard Regulations (46 CFR) require refrigerated spaces that can be locked from the outside and that cannot be opened from the inside to have an audible alarm. Where is the audible alarm required to be?

the chief steward's berthing quarters

the galley

the wheelhouse

a manned location

311

Coast Guard Regulations (46 CFR) require safety and relief valves for air service to be provided with a substantial lifting device, capable of lifting the disk from its seat when the pressure in the vessel is .

50% of that at which the valve is set to blow

75% of that at which the valve is set to blow

110% of that at which the valve is set to blow

125% of that at which the valve is set to blow

312

Coast Guard Regulations (46 CFR) require tank sounding tubes terminating above the weather deck of a cargo vessel to be fitted with a .

globe valve

stop-check valve

gate valve

screw cap or plug

313

Coast Guard Regulations (46 CFR) require that any tankship making a voyage 'of over a 48 hour duration' must have certain tests conducted not more than 12 hours prior to leaving port. Meeting this requirement includes the testing of the .

means of communication between the bridge and engineroom

fire pump relief valve

watertight door to the shaft alley

emergency lighting system

314

Coast Guard Regulations (46 CFR) require that tank sounding pipes terminating below the freeboard deck of a cargo vessel must be fitted with a .

globe valve

stop-check valve

check valve

gate valve

315

Coast Guard regulations (46 CFR) require the upper ends of sounding tubes, terminating at the weather deck, to be closed by a .

quick-closing valve

screwed cap

globe valve

self-closing gate valve

316

Coast Guard Regulations (46 CFR) require watertight doors in cargo vessels to be .

electrically controlled from a remote location

hydraulically powered only for closing

tested at each inspection for certification

tested within 12 hours after leaving port

317

Coast Guard Regulations (46 CFR) specifically prohibit seats or disks in pressure vessel relief valves to be made of .

cast iron

bronze

brass

stainless steel

318

Coast Guard Regulations (46 CFR), make certain requirements regarding over current protection. Steering gear feeder circuits shall be protected only by .

a circuit breaker with instantaneous trip

motor running overcurrent protection

a nonrenewable link cartridge fuse

a renewable link cartridge fuse

319

Coast Guard Regulations (46 CFR), require that an indicating light, located at the propulsion control station, be illuminated if there is an overload that would cause overheating of the .

forced draft blower motor

fuel pump motor

steering gear motor

condensate pump motor

320

Coast Guard regulations for small passenger vessels of less than 100 gross tons require drydocking or hauling out at intervals not to exceed 18 months if operated in .

saltwater a total of more than 9 months in the 18 month period since it was last drydocked or hauled out

fresh water a total of more than 9 months in the 18 month period since it was last drydocked or hauled out

saltwater a total of more than 6 months in the 18 month period since it was last drydocked or hauled out

saltwater continuously for 18 months

321

Coast Guard Regulations require that OSV's under 100 GT must have a steering system that is capable of moving the rudder .

by a required auxiliary steering system under emergency conditions when duplicated main steering power systems are provided

by design at one-half astern speed without damage.

from 35 degrees on one side to 30 degrees on the other side in no more than 28 seconds

from 15 degrees on one side to 15 degrees to the other side in 30 seconds at 7 knots or one-half the maximum service speed

322

Coast Guard Regulations require that vessels of 500 GT or less, what equipment must be tested weekly?

Storage batteries to provide all power for the vessel and operated under load for emergency lighting.

All vessel internal control system alarms.

Emergency astern operations, regardless of vessel location

Run emergency generator, driven by an internal combustion engine, under load for at least 2 hours.

323

Compared to a constant pitch propeller, a controllable pitch propeller .

more efficiently uses available engine power

operates at a lower efficiency at a fixed speed

produces the same torque at lower engine power

develops its rated power at a lower speed

324

Compared to internal structural plating, the exterior hull plating on a MODU is usually .

stronger

thinner

more corrosion resistant

a lower grade steel

325

Compared to poppet and other mechanically operated valves, which of the following advantages is gained by using a thin plate (feather) low lift type valve in an low pressure air compressor?

They improve compression efficiency.

They operate with a minimum of noise.

They are simple and easy to replace.

All of the above.

326

Compensated flow control, or constant flow valves are used in hydraulic systems to .

compensate for major leaks in the system

maintain the original fluid viscosity

allow for changes in pressure and temperature within the system

assure constant fluid temperature

327

Concerning frost appearing on one set of evaporator coils of a multi-box, direct expansion type refrigeration system, what is true?

the frost will increase the value of superheat to the fluid leaving the coils

the frost will assist in increasing the refrigeration effect

the frost can be removed by passing hot vapors through the coils

the frost can be quickly removed by simply shutting off fluid flow to the coils

328

Concerning the charging of refrigerant into a vapor compression refrigerating system, which of the following is true?

when charging as a vapor it should be directly to the receiver only

when charging as a liquid it should be to the low side only

when charging as a liquid it should be to the high side only

when charging as a liquid it may be to the low or high side

329

Concerning the evaporator pressure regulator drawing shown in the bottom of the illustration, what statement is true?

"P" refers to an internal pilot passage sensing evaporator pressure

"P" refers to an internal pilot passage sensing suction line pressure

"Q" refers to an external pilot connection used simultaneously with the internal pilot passage "P"

"A" refers to the adjusting stem used to set the maximum allowable evaporator pressure

330

Concerning the operation of refrigeration systems, frosting or sweating of a liquid line is usually indicative of what condition?

high relative humidity surrounding the liquid line

a liquid line restriction

the refrigerant contaminated with moisture

proper cooling taking place

331

Concerning the proper installation of the sensing bulb of a thermal expansion valve that is attached to the evaporator tail coil on a horizontal run, what statement is true?

the bulb should be attached so that the pinched off tubing should be oriented down and the capillary tube running to the valve diaghragm should be oriented up

the bulb should be attached so that the pinched off tubing should be oriented up and the capillary tube running to the valve diaghragm should be oriented down

the bulb should be attached so that the pinched off tubing should be oriented to one side and the capillary tube running to the valve diaghragm should be oriented to the opposite side

the bulb should be attached with no regard to the orientation of the pinched off tubing or the capillary tube running to the valve diaphragm

332

Condensate must be drained from the intercooler and aftercoolers of an air compressor because .

the cooling effect of the condensate reduces the compressor's efficiency

a danger of explosion exists whenever water is present in a compressor

water contamination causes erratic operation of pneumatic components

the volumetric capacity of the first stage is reduced if water remains

333

Condensate must be drained periodically from the air compressor receivers to prevent .

second stage cylinder lockup

oil sump contamination

faulty operation of pneumatic valves

corrosion of air receiver baffles

334

Considering systems with equal capacities for heat removal, which refrigeration system can employ the smallest compressor?

Ammonia

Carbon Dioxide

Dichlorodifluoromethane

Monochlorodifluorometh ane

335

Constant superheat is maintained at the evaporator coil outlet of a refrigeration system or unit by the action of what device?

solenoid valve

low pressure cutout switch

king valve

thermal expansion valve

336

Consultation should be made prior to beginning the conversion of an existing CFC-12 system to HFC-134a with what entity?

the Environmental Protection Agency

the system's manufacturer

the United States Coast Guard

the owner of the system

337

Copper is sometimes used for fluid power lines because it .

has good resistance to high temperatures

has high resistance to corrosion

withstands heavy vibration under heavy system loads

resists hardening under stress

338

Cracks may be prevented from developing at the corners of welded plate inserts by .

squaring the corners

rounding the corners

plug welding the corners

slot welding the corners

339

Cracks may be prevented from developing at the corners of welded plating inserts by .

squaring the corners

rounding the corners

plug welding the corners

slot welding the corners

340

Cylinder inlet valve failure in a low pressure air compressor can be caused by .

flywheel misalignment with the driving motor

mechanical failure in the unloader

insufficient rocker arm clearance

excessive moisture buildup in the receiver

341

Cylindrical, replaceable silica gel core dehydrators installed in halocarbon refrigerant systems are typically arranged in what way?

so that the liquid enters at the top and leaves at the bottom when located vertically in the liquid line

so that the liquid enters at the bottom and leaves at the top when located vertically in the liquid line

horizontally if a liquid drying agent is also used

horizontally if the drying agent is calcium oxide

342

Deck beams on a MODU are generally spaced at equal intervals and run .

longitudinally

vertically

transversely

intermittently

343

Deck beams on a MODU are generally spaced at equal intervals and run .

longitudinally

vertically

transversely

intermittently

344

Deck rails on passenger decks of vessels engaged in a ferry or excursion type operation shall be at least .

30 inches high

36 inches high

39 1/2 inches high

42 inches high

345

Devices, such as a pressure gage, that are subject to continuous expansion and contraction are affected by hysteresis. This is a natural process that .

allows a material to return to its exact original shape

permits a resilient material to return to its almost original shape

allows a resiliant material to resist permanent deformation

is directly related to a material's elastic limit

346

Differential pistons used in some reciprocating air compressors, serve to provide .

a means of distributing side pressures over a wider area of each cylinder

a means of unloading during start-up

more than one stage of compression by each piston

a variable compression ratio enabling the output to be varied to suit any load condition

347

Differential pressures can be measured with the use of a .

diaphragm type gage

pressure transducer

manometer

all of the above

348

Directional control valves used in hydraulic systems may be positioned .

manually

mechanically

electrically

all of the above

349

Double seated, pneumatically controlled, regulating valves exhibit good balancing characteristics essential for low- sensitivity applications because .

high pressure enters between the seats and creates equal, but opposing forces

they employ a specially fabricated diaphragm

the feedback control signals balance the opposing forces acting on the diaphragm

the special diaphragm motor spring resists pressure changes

350

Double trunk pistons are used in some refrigeration compressors to reduce oil foaming in the crankcase by what means?

increasing compressor volumetric efficiency

producing higher compression pressures

minimizing free contact between refrigerant and oil in the crankcase

eliminating the need for a shaft seal

351

Dry seal threads, typically used for tubing to pipe connectors, and threaded piping in hydraulic systems are .

the same as National Pipe threads

different than NPT as the crest of a matching thread is in contact with the trough of the opposing thread

different than NPT as the flanks of the matching threads are in contact with the opposing threads

the same as National Fine threads

352

Dual electro-hydraulic steering units usually operate .

with both pumps on line at the same time

with one pump on standby

with the follow-up gear disconnected

only when the rudder is moved amidships

353

During normal operation, traditionally, how has most of the refrigerant released to the atmosphere from low pressure systems?

through water-side system leaks

through the purge unit vent

through a leaking rupture disk

through the compressor shaft seal

354

During operating periods of a multi-box refrigeration system using a capacity controlled compressor, when all of the evaporators of a four box plant are actively being fed with liquid refrigerant, the control oil pressure acting on the hydraulic relay piston will be at what value?

the lowest

at its mid-range

the highest

of no consequence as the lube oil is not used in the operation of the unloader

355

During operating periods of a multi-box refrigeration system using a capacity controlled compressor, when half of the evaporators of a four box plant are actively being fed with liquid refrigerant, the control oil pressure acting on the hydraulic relay piston will be at what value?

the lowest

at its mid-range

the highest

of no consequence as the lube oil is not used in the operation of the unloader

356

During operating periods of a multi-box refrigeration system using a capacity controlled compressor, when only one of the evporators of a four box plant are actively being fed with liquid refrigerant, the control oil pressure acting on the hydraulic relay piston will be at what value?

the lowest

at its mid-range

the highest

of no consequence as the lube oil is not used in the operation of the unloader

357

During tests to discover why a refrigeration compressor is running continuously, it is determined that the refrigerated space temperature is slightly above normal without ever reaching the desired minimum temperature. Suction and discharge pressures are normal for the corresponding box temperature. In this situation, what should you suspect?

leaking door gaskets

high cooling water temperature

air in the system

a shortage of refrigerant

358

During the initial cooling down of a box temperature in a refrigeration system, which of the devices listed is used to prevent excessive gas pressure at the compressor suction for the purpose of prevention of overloading of the compressor driver?

Crankcase pressure regulator

High pressure cutout

Solenoid valve

Low pressure cutout

359

During the inspection for certification of small passenger vessel of less than 100 gross tons, a hydrostatic test of 1-1/4 times the maximum allowable working pressure shall be made to .

tubular heat exchangers

hydraulic accumulators

refrigeration service heat exchangers

oil fired boilers

360

During the normal operation (air supply 50-100 psi) of the device shown in the illustration, which of the components listed below will be open?

B

D

G

H

361

During the operation of a five box refrigeration system, using a fixed capacity compressor, two additional boxes came on line with the two boxes already in the active cooling process. At the beginning of the cooling period for the two additional boxes, the operating conditions of the system would require the quantity (flow rate) of refrigerant to the compressor suction to do what?

remain the same, with a decrease in suction pressure

increase, while maintaining the previous suction pressure

remain the same with an increase in suction pressure

increase, with an increase in suction pressure

362

During the operation of a large multi-box refrigeration system, using a fixed capacity compressor, only two of the five boxes are in the process of actively being cooled. If two additional boxes were to be brought into the cooling process simultaneously, how would the system react?

high side pressure would drop by 25 psi at the beginning of the cooling period

amount of subcooling via the condenser would increase by approximately 5F

low side pressure would temporarily increase

low side pressure would temporarily decrease

363

During the operation of the device shown in the illustration, the required compressed air output has stabilized within a pressure range of 100-110 psi. Which of the following statements of operating conditions is correct?

Component "B" is closed and will open when output pressure had dropped below 50 psi.

Component "D" is open and will close when output pressure rises above 110 psi.

Component "F" will force "E" to be driven to the full open position.

Component "E" is modulated proportionally in response to the required output.

364

During the repair and overhaul of the pump relief valve, used in a hydraulic system, the set point was reduced by 100 psi. Which of the following statements describes the result of the set point being lowered?

The pump discharge pressure will remain at the same pressure prior to the relief valve being repaired.

The solenoid controlled, three-position, spring centered control valve response will be quicker.

The fluid viscosity will increase during operation.

The movement of any system actuator will now be slower.

365

Each drilling unit equipped with helicopter fuel storage tanks must have the tanks installed as far as practicable from the .

landing area and sources of vapor ignition

main deck

engine room

drill floor

366

Each vessel designed to carry more than 49 passengers must have .

a continuous longitudinal watertight bulkhead

a collision bulkhead

at least one watertight bulkhead to prevent fire advancement for 2 hours

a minimum of four watertight bulkheads

367

Electric and electro-hydraulic steering gear motors are required by Coast Guard Regulations (46 CFR) to be .

protected by a circuit breaker set at 125% and a thermal overload device

provided with a running motor overcurrent protection device

served by a single two conductor cable

served by two feeder circuits

368

Emergency lighting on small passenger vessels of less than 100 gross tons for lounge areas below the main deck shall be .

illuminated at all times while vessel is underway

illuminated automatically and actuated upon failure of the main lighting system

portable battery operated and have sufficient capacity for 8 hours of continuous operations

both "A" and "C"

369

Energy imparted to the hydraulic fluid in an operating hydraulic system is stored in the .

accumulator

actuator

ram

reservoir

370

Energy losses occurring in a hydraulic system are ultimately absorbed by the .

reservoir expansion chamber

hydraulic piping flexibility

atmosphere as heat

fluid as friction

371

EPA Clean Air Act rules permit refrigerant to be released to the atmosphere under which of the following conditions?

when testing a system for leaks using R-12 and nitrogen

when release is considered 'de minimis'

when adding oil to a compressor

during replacement of a compressor

372

Every automated machinery plant must have an 'engineer's assistance' alarm. Power for this alarm should be taken from the .

main bus

emergency bus

standby generator

general alarm power supply

373

Excessive circulation of the lubricating oil with the refrigerant in a refrigeration system will cause what operating symptom?

carbon deposits on the compressor suction valves

poor evaporator heat transfer

rapid corrosion of the thermal expansion valve

no operating problems

374

Excessive lube oil consumption by a reciprocating air compressor can be caused by .

increasing the operating pressure differential

using oil having an excessive viscosity

intercooler or aftercooler leaks

carrying the oil level higher than normal

375

Excessive lube oil consumption in a reciprocating air compressor is an indication of .

leakage in the aftercooler

leakage in the intercooler

worn or broken piston rings

defects in the high pressure unloader

376

Excessive moisture being collected in the purge unit of a low pressure refrigeration system could indicate which probable condition?

leaking condenser or chiller tubes

low efficiency purge unit

dryer core needs replacement

improper charging of refrigerant

377

Excessive oil foaming in the crankcase of a refrigeration compressor is most likely to occur under what compressor operating condition?

has run continuously for a long period

suction pressure is below normal

oil level is below normal

starts after a long idle period

378

Excessive propeller vibration may occur as a result of .

operating at low speed

high water pressure under the hull

cavitation

operating in deep river channels

379

Excessive, prolonged oil foaming in the crankcase of a refrigeration compressor at start up can cause what to happen?

compressor damage from a lack of proper lubrication

formation of sludge in the crankcase

increased viscosity in the lubricant

carbon deposit on the compressor suction valves

380

Excessive, pronlonged oil foaming in the crankcase of a refrigeration compressor can result in what condition?

overheated compressor bearings

excessively high lube oil viscosity

carbon deposits on the compressor piston rings

wax crystals forming in the thermal expansion valve

381

Excessively low air pressure occurring in the intercooler of a reciprocating air compressor is caused by .

leaky discharge valves on the LP cylinder

leaky discharge valves on the HP cylinder

insufficient intercooler cooling

low ambient air pressure

382

Excessively tight drive belts installed between a motor and a refrigeration compressor pulley may cause what condition?

premature wear of the pulley end motor shaft bearing, but normal wear of the pulley end compressor crankshaft main bearing

normal wear of the pulley end motor shaft bearing, but premature wear of the pulley end compressor crankshaft main bearing

premature wear of both motor shaft bearings and both compressor crankshaft main bearings due to belt slippage

premature wear of both the pulley end motor shaft bearing and the pulley end compressor crankshaft main bearing due to overloading

383

Expansion tanks when used in a ships hot water heating system, may be of the open or closed type. In a closed type system, what would be the normal temperature range of the water?

180F to 212F

220F to 240F

260F to 280F

320F to 360F

384

Expansion valve maintenance should include which of the following procedures?

Cleaning of in-line strainers as necessary.

Ensuring that the thermal bulb is in good contact with the suction line and insulated.

Checking that the thermal bulb is in the proper location.

All of the above.

385

Failure of the steam pressure reducing valve to deliver proper steam pressure could be caused by .

frictional losses downstream of the valve

low pressure in the steam supply to the valve

reduced steam pressure acting on the underside of the valve diaphragm

high pressure steam acting upon the auxiliary valve

386

Ferrous metals are metals containing .

no iron

a large percentage of copper

a large percentage of iron

a large percentage of aluminum

387

Figure "B" in the illustration is improperly installed. A restriction will develop in this hose .

at the right hand end, regardless of the direction of flow

at the left hand end, regardless of the direction of flow

ahead of the direction of flow

trailing the direction of flow

388

Figure "C" in the illustration, is an improperly installed hose, with the restriction developed at the .

right hand fitting being small than required

center of the hose

sharp bend formed at the left

90 bend as required of the installation

389

Figure "D" in the illustration is an improperly installed hose with a restriction developed at the .

right hand fitting being smaller than required

severe bend in loop

sharp bend formed at the left

indicated radial twist

390

Flanged joints in high pressure hydraulic system piping are commonly made leak proof by .

seal welding the flange circumference

incorporating the use of neoprene O-rings

using teflon threaded connections

using street elbows whenever posible

391

Flash gas formed in the liquid line of a direct reciprocating air conditioning system may cause what condition?

pressure at expansion valve inlet to increase

expansion valve pins and seats to erode

expansion valve capacity to increase

pressure difference across the expansion valve to increase

392

Flexible hose under pressure in a hydraulic system will .

tend to twist about its long axis

expand in length and in diameter

contract in length and expand in diameter

flex at right angles to the applied pressure

393

Flooding back' is a condition where the liquid refrigerant does what in a refrigeration system?

vaporizes in the condenser

reaches the compressor through the suction line

flashes in the liquid line

condenses in the receiver

394

Foaming of the oil in a refrigeration compressor crankcase is caused by what condition?

refrigerant boiling out of solution from the lube oil

refrigerant vapor condensing in the crankcase

lube oil viscosity being increased by refrigerant dilution

compressor suction pressure suddenly increasing

395

Following the withdrawal of the tail shaft, which non- destructive test could be used to locate cracks? I. liquid penetrant dye II. magnetic flux

I only

II only

Both I and II

Neither I nor II

396

For any given volume of compressed air produced by a multistage air compressor, interstage cooling will .

increase the power required for compression

decrease the power required for compression

allow isothermal compression of the air charge

allow the compressed air volume to remain constant

397

For MODU's operating under the U.S. flag, the construction portfolio must contain .

detailed construction plans

chemical and physical properties of ABS approved steels

approved welding procedures and welding test procedures

loading conditions and limitations

398

For most multi-box refrigeration systems, the refrigerant sight glass would be located where in the system?

before the compressor in the suction line

after the compressor in the discharge line

after the condenser in the drain line to the receiver

after the receiver in the liquid line

399

For safe storage, the maximum allowable temperature to which refrigerant bottles should be exposed is what temperature?

100F

125F

150F

175F

400

For the proper control of the air temperature in an air conditioning system using chilled water circulation, which of the listed conditions should remain constant regardless of load changes?

Chilled water system supply temperature.

Chilled water system return temperature.

Compressor discharge temperature.

Compressor suction pressure.

401

For the various sizes of tubing and wall thickness used in a hydraulic system, the inside diameter can be determined if it is remembered that the inside diameter equals the outside diameter less .

the wall thickness

1.5 times the wall thickness

2 times the wall thickness

2.5 times the wall thickness

402

Hard drawn copper tubing connections for refrigeration systems may be made by which of the following means?

flaring

brazing

electric arc welding

threading

403

Hard drawn copper tubing is commonly used in larger refrigeration systems. What statement concerning its use is true?

Hard drawn copper tubing is easily flared, so flare fittings are commonly used.

Hard drawn copper tubing is easily bent, so elbow fittings are rarely used in changing direction.

Hard drawn copper tubing is easily swaged, so reducing fittings are rarely used in changing line size.

Hard drawn copper tubing is not easily flared, bent, or swaged, so brazed fittings are commonly used.

404

Hard drawn copper tubing is used in commercial refrigeration systems rather than steel for what reason?

copper is inherently stronger and can withstand higher pressures than steel

copper is corrosion resistant and easier to work with than steel

hard drawn copper tubing is easily bent, whereas steel is not

copper is compatible with anhydrous ammonia, whereas steel is not

405

HCFC-123 presents health threats to service technicians, which may include which of the following?

flammability as a liquid

freezing in the compressor

toxic threat

being caustic and strong offensive odor

406

HCFC-22 has been recovered from a refrigeration system prior to and in preparation for condenser replacement. What is true concerning the recovered refrigerant?

it may be recycled into a system that had used HCFC-11

it may be reclaimed as a low pressure system refrigerant

it may returned to the system for re-use

it must be destroyed, as it can no longer be re- used

407

Heat is removed from the refrigerant circulating through the refrigeration system, shown in the illustration, by which component?

A

B

J

K

408

High suction pressure accomapnied by low suction temperature to a refrigeration system compressor is caused by which of the following?

the expansion valve is insufficiently opened

the expansion valve being open too wide

the king valve is insufficiently open

a clogged liquid-line strainer

409

Hot gas bypass is one of the methods used to produce what effect?

relieve excessive compressor head pressure

produce flash gas at the expansion valve

reduce flooding of the receiver at low loads

defrost the evaporator coils

410

Hot water system heat exchangers are selected for the heating load required plus about 50% excess capacity to allow for .

start-up

increased thermal efficiency

increase capacity during times of peak demand

heat loss due to insufficient insulation

411

How can the chance of contaminating hydraulic fluid be decreased when working on hydraulic systems?

Clean the fittings before they are disconnected.

Place drip pans under leaky fittings.

Seal any cracks in lines with Permatex.

Coat all threads with graphite oil.

412

How do modulating valves, found in some container refrigeration systems, differ in operation from conventional solenoid valves found in the same system?

A conventional solenoid valve is either open or closed, whereas a modulating valve can achieve any degree of opening.

A modulating valve is either open or closed, whereas a conventional solenoid valve can achieve any degree of opening.

A conventional solenoid valve is either open or closed, whereas a modulating valve has three positions: open, closed, or half-open.

A modulating valve is either open or closed, whereas a conventional solenoid valve has three positions: open, closed, or half-open.

413

How does a refrigeration solenoid valve differ from a modulating valve?

A solenoid valve can only be installed in liquid lines.

A liquid line solenoid valve is either completely opened or closed, whereas a modulation valve is infinitely positioned according to the strength of the applied electrical signal.

Solenoid valves are only used in low voltage refrigeration control systems, while modulation valves are used in high voltage applications.

Both valves operate in exactly the same manner, only the manufacturer's terminology is the differentiating factor.

414

How is the amount of refrigerant in a storage cylinder measured?

pressure

volume

weight

temperature

415

How long must the records of tests and inspections of fire fighting equipment for a MODU be retained on board?

Six months

One year

Three years

Until the next inspection for certification

416

How much heat per hour can a 5 ton refrigeration unit remove from a refrigerated space?

60,000 BTU/hr

80,000 BTU/hr

100,000 BTU/hr

120,000 BTU/hr

417

How often must a U.S. Coast Guard engineering license be renewed?

Annually

Every 3 years

Every 5 years

Every 10 years

418

How should small appliances with less than three pounds of refrigerant be charged with refrigerant?

liquid charged

vapor charged

either vapor or liquid charged

initially liquid charged and then topped with a vapor charge

419

Hydraulic cranes must be properly warmed-up before being operated because .

warm-up allows the hydraulic system to become charged with oil

warm-up allows the relief valves to be properly tested

hydraulic strainers operate only during the warm-up period

warm-up allows the hydraulic fluid to reach proper viscosity

420

Hydraulic hose assemblies are permitted by 46 CFR to be installed between two points of relative motion .

provided proper releasing mechanisms are available to enable quick disconnect capabilities

but shall not be subjected to torsional deflection under any conditions of operation

provided the entire length of the device is visible to the operator at all times

to prevent the formation of loading stresses

421

Hydraulic machinery failures are commonly caused by contamination of the hydraulic fluid and .

fluid friction

fluid turbulence

component misalignment

pressure surges

422

Hydraulic machinery failures are commonly caused by misalignment of the system components and by .

hydraulic fluid contamination

excessive fluid friction

turbulent fluid flow

fluid pressure surges

423

Hydraulic pumps most commonly used in steering systems are of the .

lobe type

screw type

axial piston type

volute type

424

Hydraulic system reservoirs are often fitted with a combined filler/breather cap. If the breather element becomes fouled, the .

reservoir will become pressurized

reservoir will be subjected to a partial vacuum

flow through the return lines will be stopped

actuator response time will be halved

425

Hydraulic system reservoirs should be maintained at recommended normal levels to reduce .

condensation on inside walls

heat retention of working fluid

frequency of fluid changeover

all of the above

426

Hydraulic system tubing should be anchored every three or four feet to prevent .

excessive pump cavitation

expansion and contraction of the tubing

tube fitting leaks from vibration and pressure surges

tube flexing at right angles to the applied fluid pressure

427

Hydraulic systems typically operated for intermittent service do not require the use of oil coolers and would include all of the following except ?

Constant tension mooring winch system

Hatch cover systems

Watertight door system

Internal combustion engine hydraulic starter system

428

Hydraulically, servo-operated, automatic, change over valves, utilized in a two ram hydraulic steering gear, serve to .

allow an alternate main pump to start in the fully loaded condition thus developing immediate full torque.

prevent the idle main pump from being hydraulically motored by cross pressure flow.

prevent main pumps from operating simultaneously which could result in the over pressurization of the system.

all of the above.

429

Hydraulically, servo-operated, automatic, change over valves, utilized in a two ram hydraulic steering gear, serve to .

allow an alternate main pump to start in the fully loaded condition thus developing immediate full torque

prevent either main pump from being hydraulically motored when idle by cross pressure flow

prevent both units from operating simultaneously which could result in doubling the flow of oil and pressure leading to over pressurization of the system

all of the above

430

If "A" were open to the atmosphere, as shown in the illustration, the pressure gage would read zero and the levels in the "U" tube would be equalized. If "D" is manufactured to indicate inches of water, what will be indicated reading of the diaphragm gage if the atmospheric pressure is 14.7 psia?

D = 407.6 inches of water

D = 0.0 inches of water

D = 14.76 inches of water

D = 27.73 inches of water

431

If a compressor starts and stops very frequently, what term is used to describe this behavior?

long-timing

short-timing

long-cycling

short-cycling

432

If a condenser coil of an air-cooled container refrigeration system becomes dirty and requires cleaning, what would be an acceptable method of cleaning?

Binks' gun with weak acid solvent

high pressure water wash

copper wire rotary brush

all of the above

433

If a hydraulic pump is overheating, the cause may be .

excessive internal slippage in the pump

low discharge pressure and fluid flow

excessive fluid level in the hydraulic reservoir

operation of the pump at 100% efficiency

434

If a hydraulic pump is producing a noisy whine when in operation, the cause may be .

an air leak in the pump suction line above the oil level in the reservoir

low viscosity in the hydraulic fluid

an oil leak across the pump shaft packing

due to the wrong direction of rotation of the hydraulic motor

435

If a hydraulic pump sounds like it is pumping rocks when in operation, the problem is most likely .

cavitation

galvanic action

slippage

None of the above

436

If a leak occurs between the areas labeled "B" and "J" of the control valve shown in the illustration, which of the following problems is most likely to occur?

The valve will open with a decrease in temperature below the set point of the liquid being heated.

The valve will close with a decrease in temperature below the set point of the liquid being cooled.

The valve will open with an increase in temperature above the set point of the liquid being heated.

The valve will close with an increase in temperature above the set point of the liquid being cooled.

437

If a lifeboat winch allows a lifeboat to descend to the water at an excessive speed, you should .

remove unnecessary weight from the boat

adjust the centrifugal brake mechanism

adjust the davit mounted limit switches

engage the motor friction clutch bands

438

If a liquid drying agent is used in a refrigeration system already equipped with a solid drying agent, the liquid drying agent will cause what type of reaction?

it will release the moisture already trapped in the solid drying agent

it will react violently with the solid drying agent

it will cause toxic gases to form in the refrigerated space

it will solidify the refrigerant oil in the compressor crankcase

439

If a liquid sight flow indicator in a refrigeration system shows gas bubbles in motion passing inside of the glass, what does this indicate?

too much refrigerant in the system

oil entrained in the refrigerant

less than a full charge of refrigerant in the system

ice crystals forming in the refrigerant

440

If a radial piston hydraulic pump fails to deliver rated fluid volume, the cause can be .

contaminated fluid

pitted thrust rings

worn pintle bearings

obstructed suctions passage

441

If a reciprocating air compressor has a knock occurring in frequency with its operating RPM, the cause is probably .

worn main bearings

insufficient cylinder lubrication

defective drive belts

all of the above

442

If a refrigerated space has associated with it a heat load of 60,000 BTU/hour, what size refrigeration unit would be required?

3 ton

4 ton

4.5 ton

5 ton

443

If a refrigeration compressor crankcase is sweating or frosting and this is accompanied by unsusual noises coming from the compressor, what is most likely the cause?

excessive evaporator superheat

a minor amount of air in the system

normal oil circulation with the refrigerant

the expansion valve being stuck in the open position

444

If a refrigeration compressor had a higher than normal suction pressure, the problem could be a result of which of the following?

a minor accumulation of air or noncondensable gases in the system

a constant loss of refrigerant

leaking compressor suction valves

a slightly higher than normal liquid level in the receiver

445

If a refrigeration compressor had developed a slightly high suction pressure accompanied with an abnormally low suction temperature, the problem could be a result of which of the following?

a minor accumulation of air or noncondensable gases in the system

a leaking king valve

a clogged subcooler

liquid refrigerant flooding back from the cooling coil

446

If a refrigeration compressor in a multi-box system runs continuously, which of the following might be a cause?

the high pressure cut- out switch is 'stuck' in the closed position

the system is overcharged with refrigerant

the system has a shortage of refrigerant

one of the TXV power elements has lost its charge

447

If a refrigeration compressor is short cycling on high head pressure, what should you do?

purge the condenser if the waterside is dirty

check for proper water flow through the condenser

increase the high pressure cutout setting

reduce the cooling water flow

448

If a refrigeration compressor using a thermostat as a primary controller is running continuously without significantly lowering the temperature in the refrigerated space, which of the following is most likely the trouble?

a shortage of compressor oil

warm food in the refrigerator

excessive condenser cooling water

a shortage of refrigerant

449

If a refrigeration compressor were short cycling on the low pressure cutout switch, what is the most probable cause?

the system was overcharged with refrigerant

the high pressure switch was improperly adjusted

the expansion valve strainers were fouled

the suction valves were leaking slightly

450

If a refrigeration compressor were short cycling on the low pressure cutout switch, what might be the cause?

the system was overcharged with refrigerant

the crankcase was low on oil

the suction valves were leaking slightly

the system was low on refrigerant

451

If a refrigeration compressor will not start even though the box temperature is high, which of the following would be a probable reason for this?

the pressure regulating valve is not closing

an excessive lack of refrigerant in the system

badly leaking discharge valves

worn piston rings

452

If a refrigeration system compressor crankcase is exhibiting an unusual degree of sweating or frosting and is operating noisily, what should be done?

add refrigerant to the system

check the evaporator superheat

add oil to the crankcase

open the hand expansion valve

453

If a refrigeration system compressor were short cycling on the low pressure cutout switch, what might be the cause?

the system was overcharged with refrigerant

the system was low on refrigerant

the suction valves were leaking slightly

the relief valve was leaking slightly

454

If a refrigeration system extracted 48,000 BTU per hour from the refriogerated space, what would be the equivalent tonnage of the unit?

2 tons

4 tons

6 tons

8 tons

455

If a refrigeration system is overcharged with refrigerant, what would be the result?

low suction pressure

higher than normal compressor head pressure

increased system operating efficiency

short cycling on the low pressure cutout

456

If a refrigeration system were moderately short of refrigerant charge, the condition would result in what operating symptom?

continuous running of the compressor

high suction pressure

high discharge pressure

short cycling of the compressor on the high pressure cutout

457

If a refrigeration system were short of refrigerant, besides an elevated box temperature, what would be an observable symptom?

continuous running of the compressor

high suction pressure

high discharge pressure

short cycling of the compressor on the water failure switch

458

If a refrigeration system, equipped with a reciprocating compressor, has a liquid-line solenoid valve that is leaking during the 'off' cycle, what would this cause?

low suction pressure

high superheat in the outlet coil

noisy compressor operation upon starting

refrigerant slugs in the receiver

459

If a refrigeration unit is fitted with suction and discharge services valves constructed similarly to the valve labeled "D" in the illustration, what statement is true concerning the valve status when servicing is complete and the gauge manifold set is removed, with the unit in normal operation, assuming that no permanently installed gauges or pressure switches are connected to the service port "1".

The valves are fully back-seated, with the packing tightened, and the seal cap in place.

The valves are fully front- seated, with the packing tightened, and the seal cap in place.

The valves are cracked off their back-seats, with the packing tightened, and the seal cap in place.

The valves are cracked off their front-seats, with the packing tightened, and the seal cap in place.

460

If a severe leak develops in the electro-hydraulic steering gear, which of the listed conditions could result?

Loss of vessel steering

Overheating of the gyrocompass

Jamming of the six-way valve

Jamming of the follow- up device

461

If a ship service air compressor failed to unload the .

compressor would run continuously

air receiver pressure would be excessively low

belts could slip when starting

compressor would pump lube oil

462

If a ship service air compressor failed to unload, the .

compressor would dangerously overspeed

air receiver pressure would be excessively low

circuit breaker may open on starting

compressor would pump lube oil

463

If a ship service air compressor operating in intermittent service were failing to unload, the .

compressor would stop abruptly when power was secured

compressor would run continuously

air receiver indicated pressure would be excessively low

compressor would require more than the normal amount of lubrication

464

If a specifically trained and qualified person is NOT on board a vessel to assess a new officer trainees practical demonstration or skills, the demonstration can be conducted, when provided with guidance, and signed off by .

any rating forming part of the watch

the vessel owner

any licensed officer at the management level

All of the above

465

If a stateroom has a 5 inch by 12 inch opening through which the air travels at 100 feet per minute, what is the volume of air being supplied to the stateroom?

41.6 cu. ft/min

51.6 cu. ft/min

61.6 cu. ft/min

81.6 cu. ft/min

466

If a stateroom has a 6" by 12" opening through which air travels at 100 feet per minute, what is the volume of air being supplied to the stateroom?

36 cu ft/min

50 cu ft/min

72 cu ft/min

100 cu ft/min

467

If a thermostatic expansion valve is adjusted for too high a superheat value in a TXV controlled single evaporator refrigeration system what will be the result?

all of the system liquid will flow to and flood the evaporator coil

an insufficient amount of liquid will be fed to the evaporator

an excessive amount of liquid will be fed to the evaporator

only the required amount of refrigerant will enter the evaporator regardless of the required superheat value

468

If a thermostatic expansion valve is adjusted for too low a superheat setting, what will be the result?

the efficiency of the unit will be increased

liquid may flood back to the compressor

the box temperature will decrease causing an expansion of the volume of air

the refrigeration effect will increase contributing to uncontrolled box temperatures

469

If air at 95F dry bulb temperature and 50% relative humidity is conditioned to 75F dry bulb temperature and 50% relative humidity, this is an example of what type of process (or processes)?

cooling only

cooling and humidifying

cooling and dehumidifying

adiabatic cooling

470

If all of the air charge has been lost from a ship service air receiver, the compressor mechanical unloading system will .

fail to work, and the drive motor will trip the circuit breaker as the compressor will be overloaded

fail to function as designed, but the compressor having no load will start with little or no difficulty

still function normally at start-up

Still function normally, but the safety interlock will stop the drive motor

471

If ammonia vapor is lighter than air, what statement concerning the concentration of ammonia would be true should a leak occur?

the concentration would be lower near the overhead of an enclosed space

the concentration would be dependent upon available free hydrogen ions

the concentration would of minimum importance during venting procedures

the concentration would be lower near the deck of an enclosed space

472

If an abnormally large difference is maintained between the evaporator refrigerant temperature and the box air temperature within the refrigerated compartment, what will be the result?

the compressor will tend to trip out on high head pressure

the evaporator coil will tend to excessively frost

the compressor will tend to overheat due to high suction temperature

the box tempereature will be pulled down too low

473

If an air compressor is used to supply air primarily to the combustion control system and other pneumatic controllers, the entire system is known as the .

control air system

forced draft air system

supply air system

ships service air system

474

If an air compressor is used to supply compressed air to outlets throughout the engine room and on deck of a vessel, the system is known as the .

combustion control air system

supply air system

ship's service air system

low pressure deck air system

475

If an air conditioning system were rated at 24,000 BTU, what would be the equivalent tonnage of the unit?

1 ton

2 tons

3 tons

4 tons

476

If an anchor windlass has been idle for some time, you should .

repack all valve stems

lubricate it prior to use

replace the foundation bolts

balance the warping heads

477

If an electric motor driven air compressor fails to start, it may be due to a .

leaking discharge valve

jammed suction valve

tripped overload relay

broken discharge unloader

478

If any of the discharge valves on a refrigeration compressor are leaking slightly, the compressor will have a tendency to exhibit which of the following behaviors?

run continuously

not start

short cycle on the low pressure cut-out switch

short cycle on the high pressure cut-out switch

479

If condensation collects and drips off an evaporator coil, what best describes the operating temperature of the coil?

it is at a maximum of 21F

it is above 32F, but below the dew point

it is at 21F but, above the dew point

it is below 32F and below the dew point

480

If dirt is allowed to contaminate the sump of a hydraulic deck crane, which of the following problems will occur?

All the seals in the hydraulic lines will immediately blow out.

The lifting capacity of the crane will be immediately reduced by 70%.

The sheathing on the hydraulic lines will fracture.

The internal parts of the pump and hydraulic motor will wear excessively.

481

If high relative humidity is maintained in a cargo hold, there is a significant possibility for which of the following to happen? I. there will be an accumulation of static electricity II. mold will grow and contaminate the cargo

I only

II only

Both I and II

Neither I nor II

482

If high relative humidity is maintained in a cargo hold, there is a significant possibility that which of the following conditions could occur? I. there will be an accumulation of static electricity II. mold will grow and contaminate the cargo

I only

II only

Both I and II

Neither I nor II

483

If hot oil comes in contact with a diesel engine turbocharger, catches fire, and causes in excess of $(USA)25,000 damage to your ship, by law this must be reported to the .

engine manufacturer

American Bureau of Shipping

U.S.C.G. Officer in Charge, Marine Inspection at the next port

vessel underwriters

484

If increasing the cooling water flow to a refrigeration condenser fails to lower the condenser pressure, the probable cause may be due to what condition?

an evaporator coil in need of defrosting

a low level of freon in the reciever

partially blocked thermal expansion valve

excessive amount of non-condensable gases trapped in the condenser

485

If it becomes absolutely necessary to operate two compressors in parallel in order to maintain the box temperatures, a careful watch should be kept on what parameter?

discharge pressure gauges of both compressors

suction pressure gauges of both compressors

oil pump discharge pressures of both compressors

oil levels in both compressor crankcases

486

If it becomes necessary to start an axial piston hydraulic motor under conditions where the hydraulic fluid is colder than the lowest temperature recommended for proper operation, you should operate the system at .

minimum speed until the normal operating pressure is reached

neutral stroke until all of the air has been vented

no load until the normal operating temperature is reached

maximum torque to attain rapid warm-up

487

If it is necessary to increase the operating head pressure of the refrigeration system using the device shown in the illustration, what should be done?

"2" should be turned to further compress the spring

"2" should be turned to relax the compression of the spring

"4" should be rotated to compress the enclosed bellows

"4" should be rotated to relax the enclosed bellows

488

If it were possible to simultaneously operate both main pumps shown in the steering gear illustration, which of the following statements would be true if the starboard power unit were to be brought on line with the port unit already in operation?

The indicated valve spool in "C" would shift to the left

Pump "I" would supply replenishing oil to the system

The starboard distributor valve "A" would allow recirculation of the starboard main pump

Pump "G" would supply servo control oil flow to control the main pump stroke control mechanism

489

If oil under pressure is supplied to the space between "N" and "I" in the illustration .

"O" will be hydraulically locked in place even though oil is returned to the main pump from the left side of "N" and the area to the right of "P"

"O" will rotate clockwise as oil is returned from the left side of vane "N"

"O" will rotate counter- clockwise as oil is returned from the area between "N"

"U" will rotate counter- clockwise as oil is returned from the area between "N" and the vane located at "P"

490

If one box in a multiple box, direct expansion type refrigeration system was experiencing an excessively low temperature, this could be a result of which of the following?

liquid refrigerant returning to the compressor

excessive frost on the cooling coils

a leaking hand expansion valve

an oversized expansion valve

491

If one drive belt on an air compressor is found to be worn you should .

replace that belt only

replace all of the belts

dress the worn belt

adjust belt tension

492

If one hydraulic pump of an electro-hydraulic steering unit fails, the vessel's steering can be maintained by using the .

trick wheel

accumulator

standby pump

telemotor

493

If only the chill box solenoid valve remains open in a multiple- box refrigeration plant, the refrigeration compressor will eventually be stopped shortly after it closes once the minimum desired chill box temperature is reached. What device actually directly stops the compressor?

chill box thermostatic temperature switch

low water cutout switch

low pressure cutout switch

high pressure cutout switch

494

If outside air at 80 degrees F and 70 percent relative humidity is conditioned, what will be the resulting dew point temperature of the air just before it comes into contact with the cooling coil?

64 degrees F

67 degrees F

70 degrees F

73 degrees F

495

If passive recovery is used on a small appliance fitted with a capillary tube as a metering device with a non-operating compressor, the recovery should be made through what means?

recovery from the high side only

recovery from the low side only

recovery from both the high and low sides

by venting to atmosphere, cannot be recovered

496

If R-502, which is a mixture comprised of 48.8% R-22 and 51.2% R-115, is recovered from a refrigeration system, it must be placed in a recovery tank containing which refrigrant?

either R-22 or R-115

R-22 only

R-115 only

R-502 only

497

If solenoid "A" illustrated is energized, the .

pump should reverse the direction of flow

cylinder should extend

pump should discharge directly to the resevoir

cylinder should retract

498

If solenoid "A" of the valve illustrated is energized, the cylinder will .

extend with rate of movement controlled

retract with rate of movement controlled

extend with rate of movement uncontrolled

retract with rate of movement uncontrolled

499

If solenoid "B" illustrated is energized, the .

pump should reverse the direction of flow

cylinder should extend

pump should discharge directly to the reservoir

cylinder should retract

500

If solenoid "B" of the valve illustrated is energized, the cylinder will .

extend with rate of movement controlled

retract with rate of movement controlled

extend with rate of movement uncontrolled

retract with rate of movement uncontrolled

501

If the "B" end of the hydraulic transmission illustrated, were provided with a variable position tilting box, and the 'A: end displacement were to be constant, the .

speed output of the "B" end would increase in proportion as the tilting box angle would approach zero

available horsepower at the "B" end would increase in proportion as the tilting box angle would approach zero stroke

speed output of the "B" end would increase in proportion to increasing the "B" end tilting box angle

available horsepower at the "B" end would increase in proportion to decreasing the angle of the "B" end tilting box towards zero

502

If the "B" end were driven by an electric motor and the "A" end were disconnected from the line terminals of the motor controller, the unit illustrated could then be used as a .

mooring winch

variable output alternator

fixed output alternator

hydraulic crane power supply

503

If the air temperature increases while the atmospheric pressure remains constant, what will happen to the air?

have a greater capacity to absorb moisture

absorb less free atmospheric moisture

become supersaturated at high relative humidity

give up moisture as condensation

504

If the boom shown in the illustration can be raised, but not lowered, the problem is most likely with the "Topping Circuit" .

hydraulic pump

linear actuator controlling boom angle

counterbalance valve

counterbalance valve, ball check , failed to close

505

If the capacity of a reciprocating air compressor gradually drops off, the cause could be .

leaking compressor valves

a clogged air filter

worn cylinder liners

all of the above

506

If the combination moisture indicator and sight glass indicates an accumulation of moisture within the system, which of the listed procedures would be the most practical to follow?

Secure the system, disassemble and de-ice the thermostatic expansion valve.

Close the king valve, pump down the system, isolate the drier, remove the dessicant core and replace with new drier cartridge.

Purge the entire system to the atmosphere, replace the drier cartridge, and recharge the system with refrigerant.

Using a vacuum pump, draw the entire system down to 1,270 microns for a period of three hours.

507

If the compressor is heard to knock while pumping down the low side for repairs, but otherwise the compressor sounds normal, this is a possible indication of what condition?

worn piston rings

faulty bearings

air being introduced to the system

foaming of the crankcase oil

508

If the controlled system temperature downstream of the valve shown in the illustration, decreases below the set point, which of the listed actions will occur?

Stem "C" moves down.

Power piston "H" moves up.

Spring "F" is compressed.

Valve "D" closes.

509

If the device shown in the illustration is being used to control the output of an axial piston pump, when part "A" is moved to the right, then part "B" .

will move to the right, and "C" will move to the left, but lagging behind "B"

will move to the left, and "C" will move to the right, but will lag behind the movement of "A"

will move to the right, as will "C"

will move to the left, as will "C"

510

If the device shown in the illustration is used to control the output of a variable displacement pump, and part "A" is displaced 50% from 'zero' stroke, which of the following statements will be correct?

Pump discharge will be 100% until the effects of lost motion in the associated linkages is eliminated.

Once the pump achieved a corresponding output of 50%, the pump would automatically return to neutral stroke.

The pump would develop a 50% discharge rate and remain at that condition until the control handle position is changed.

The system unloading valve will open to guarantee a pump discharge of no more than 50%.

511

If the device shown in the illustration is used to control the output of a variable displacement pump, and the handle is displaced 50% from 'zero' stroke, which of the following statements will be correct?

Pump discharge will be 100% until the effects of lost motion in the associated linkages is eliminated.

Once the pump achieved a corresponding output of 50%, the pump would automatically return to neutral stroke.

The pump would develop a 50% discharge rate and remain at that condition until the control handle position is changed.

The system unloading valve will open to guarantee a pump discharge of no more than 50%.

512

If the discharge reed valves used in a refrigeration compressor are leaking badly, what should be done?

the compressor suction isolation valve should be throttled to compensate

the reed valves should be replaced as necessary

the compressor may continue to operate at minimum efficiency

the high pressure cut- out should be readjusted to compensate

513

If the discharge reed valves used in a refrigeration compressor are leaking badly, what statement is true?

the reed valves should be reground and relapped

the reed valves should be replaced

the low side pressure will indicate below normal

the high pressure cut- out setting should be lowered

514

If the discharge valve plates on a refrigeration compressor are leaking badly, in terms of the compresssor, what would be the operating symptom?

run continuously

not start

have high discharge pressure

short cycle on the high pressure switch

515

If the drive belts on an air compressor were squealing during startup, you should .

check the operation of the unloaders

check the air filter

check for a receiver outlet valve which may be partially closed

check for a defective high pressure cut-out switch

516

If the drive belts on an air compressor were squealing, you should fix them by .

spraying oil on the belts

tightening the belts

loosening the belts

installing wider belts

517

If the electric motor driving an air compressor fails to start, the cause may be a .

leaking unloader

tripped circuit breaker

control line leak

defective pop valve

518

If the evaporator coil horizontal return line of a container refrigeration system is less than 0.875" (2.21 cm) in diameter (considered small), the thermostatic expansion valve sensing bulb should be attached where on the return line?

on the bottom of the line to enable the bulb to absorb the maximum amount of heat

as close as possible to the expansion valve

directly below the point of maximum heat transfer

on the upper surface of the line

519

If the flow rate and pressure from a variable capacity pump was increased while supplying the device illustrated, the .

speed would increase, horsepower and torque would decrease

speed would decrease, horsepower and torque would increase

horsepower, torque, and speed would increase proportionally

horsepower, torque, and speed would decrease proportionally

520

If the flow rate to a linear actuator is reduced by half of the original amount, the .

pump discharge pressure will be reduced by a proportional amount

speed of the actuator will be reduced

speed of the actuator will be increased

the actuator will move erratically

521

If the foundation bolts of a reciprocating air compressor are loose, which of the conditions below will occur?

The drive belts will squeal

The unloaders will jam shut

The compressor will vibrate

The intercooler will leak

522

If the head pressure of a reciprocating refrigeration compressor is steadily building and becomes excessive, for protection purposes, what should occur?

the relief valve should lift open before the high pressure cutout stops the compressor

the relief valve should lift open and allow the excess refrigerant to flow to the receiver

the high pressure cutout switch should shut down the compressor before the relief valve lifts open

the relief valve should lift open and allow the excess refrigerant to relieve to the atmosphere

523

If the high pressure port became plugged in the spring- loaded, internal pilot, self-operated, steam pressure reducing valve illustrated, which of the following problems would probably occur?

The main valve would open wide and deliver high pressure steam.

The opening of the auxiliary valve "D" would have no effect on the positioning of the piston 'H.'

Main valve "B" would be opened by spring 'A.'

Spring "F" would open valve "D" causing spring "A" to compress.

524

If the hydraulic compression type tubing fitting, shown as figure "C" in the illustration begins to leak, you should .

apply more thread seal and retighten part 'IV'

apply thread seal tape around the threads between part "II" and 'IV', then reassemble and tighten

replace part "III"

replace part "I"

525

If the input signal at 'P4' is 51 psi, and the supply pressure is 50 psi, then the output pressure at 'P1', shown in the illustration will be .

0 psi

25 psi

40 psi

50 psi

526

If the intercooler of a low pressure air compressor becomes fouled either internally or externally, the .

total capacity will be reduced

volumetric efficiency will be decreased

discharge pressure will decrease

normal running time will be decreased

527

If the intercooler relief valve lifts while an air compressor is operating under load, you should check for .

a defective pressure switch or pilot valve

a leak in the intercooler piping

leakage through the low pressure unloader control diaphragm

leaking high pressure discharge valves

528

If the liquid line filter/drier pictured in figure "C" of the illustration becomes mechanically restricted with solid impurities, what would be the indication?

the moisture indicating liquid line sight glass upstream would show bubbles

the moisture indicating liquid line sight glass upstream would change to the "wet" color

the item would be warm on the inlet, but cold on the outlet

the moisture indicating liquid line sight glass upstream would change to the "dry" color

529

If the liquid line filter/drier pictured in figure "C" of the illustration becomes saturated with moisture, what would be the indication?

the moisture indicating liquid line sight glass downstream would show bubbles

the moisture indicating liquid line sight glass downstream would change to the "wet" color

the item would be warm on the inlet, but cold on the outlet

the moisture indicating liquid line sight glass downstream would change to the "dry" color

530

If the needle and seat assembly is excessively eroded, the valve cage assembly can be replaced. In replacing the original valve cage assembly rated at 1/2 tons, what would be the result if the replacement valve cage was oversized at 5 tons?

The evaporator would be starved producing consistently excessive superheat.

The expansion valve would function normally, with the presentation of no problems.

The expansion valve would hunt excessively, alternately starving and overfeeding the evaporator coil.

The evaporator would be overfed producing consistently insufficient superheat.

531

If the needle and seat assembly is excessively eroded, the valve cage assembly can be replaced. In replacing the original valve cage assembly rated at 5 tons, what would be the result if the replacement valve cage was undersized at 1/2 tons?

The evaporator would be starved producing consistently excessive superheat.

The expansion valve would function normally, with the presentation of no problems.

The expansion valve would hunt excessively, alternately starving and overfeeding the evaporator coil.

The evaporator would be overfed producing consistently insufficient superheat.

532

If the numerical designation indicated on the outside of a hydraulic hose is BXP-10, the "dash size" 10 indicates that the inside diameter of the hose is .

5/8 inch

3/4 inch

7/8 inch

1 inch

533

If the operating pressure is determined to be normal in the system shown in the illustration, yet the crane does not swing (slew) in either direction when the directional control valve is operated, the problem could be .

an obstruction in the brake release cylinder line (2)

double check valve (14) ball jammed to the left

oil cooler partially obstructed

relief valve (12) set to open at too high a pressure

534

If the operator releases the handle of the illustrated device while the system output is in motion, the valve will .

drift to an extreme position and the output speed will increase to maximum

drift to an extreme position and the output speed will drop to zero

return to its centered position and the output will increase to maximum

return to its centered position and the output speed will drop to zero

535

If the people in an air conditioned room complain of being too cool, what is most likely to be the trouble?

preheater has failed to cutout

air velocity is too low

relative humidity and dry bulb is high

dry bulb temperature is too low

536

If the pump for a hydraulic anchor windlass is over heating, the cause may be .

increased pump speed

excessive pump discharge pressure

too low of a tilting box angle

low pump speed

537

If the pump for a hydraulic anchor windlass is overheating, the cause may be .

excessive drive motor speed

excessive pump discharge pressure

too low of a tilting box angle

insufficient drive motor speed

538

If the pump in a hydraulic system produces a low rumbling noise while in operation, this is a probable indication of .

internal system fluid leakage

air passing through the pump

strained hydraulic fluid

excess internal slippage

539

If the refrigeration compressor crankcase is sweating or frosting and is operating with an unusual noise, what is most likely the cause?

a shortage of refrigerant

the compressor running continuously

liquid refrigerant returning to the compressor

the compressor short cycling on the high pressure cutout

540

If the refrigeration compressor was developing higher than normal discharge pressure, this could be a result of which of the following?

air or noncondensable gases in the system

leaking discharge valves

leaking suction valves

liquid refrigerant flooding back to the compressor from the evaporator coil

541

If the relief valve on the discharge side of a hydraulic pump lifts, the cause could be .

a low load on the unit

a clogged pump suction strainer

a blockage in the line between the pump and hydraulic motor

the hydraulic motor turning too fast

542

If the running suction pressure at the refrigeration compressor of a TXV controlled air-cooled refrigeration system is below normal, which of the following can be a cause?

refrigerant overcharge

overfeeding by the expansion valve

a restricted liquid-line strainer

a dirty condenser

543

If the running suction pressure for an operating refrigeration compressor of a TXV controlled refrigeration system is below normal, the cause may be which of the following?

an excess of liquid refrigerant

the expansion valve overfeeding

a fouled compressor suction strainer

insufficient condensing medium flow

544

If the signal input to 'P4' is 48psi, and the supply pressure is 50 psi, the output pressure at 'P1', as shown in the illustration, will be equal to .

0 psi

10 psi

25 psi

50 psi

545

If the suction line between the evaporator and compressor is heavily frosting up and the trouble is attributed to the thermal expansion valve, what would most likely be the cause?

thermal bulb coming loose from the suction line

the needle valve is stuck closed

the power element has lost its charge

internal ice formation within the expansion valve

546

If the superheat setting of a thermostatic expansion valve is set too low, what would be the result, assuming that the system has a single evaporator?

the suction line will be abnormally cold and liquid may flood back to the compressor

the suction line will be abnormally warm due to a reduced amount of refrigerant returning back to the compressor

the box temperature will be pulled way down below the normal temperature range

the receiver level will be abnormally high due to a reduced amount of refrigerant returning back to the compressor

547

If the superheat value of the thermostatic expansion valve is adjusted too high, what would be the result?

the heat removal capacity of the evaporator will increase

the evaporator will be overfed with liquid refrigerant

the suction line of the compressor will be abnormally warm

the suction line of the compressor will be abnormally cold

548

If the temperature of the ammonia gas in the discharge piping and the condenser of a refrigeration system remains above the critical tempeature of 266F, which of the following is true?

the refrigeration effect increases

the unit will begin to subcool

the vapor will cease to condense

the process of sublimation will begin

549

If the thermal bulb of an expansion valve is incorrectly placed at the center of the evaporator coil instead of the end (tail coil), it will have which of the following effects?

increase the heat removal capacity of the evaporator coil

increase the superheat present at the bulb location

deliver more refrigerant to the evaporator coil

decrease the heat removal capacity of the evaporator coil

550

If the valve labeled "23" in the illustration is set for a higher pressure, what will be the direct result?

chill box space temperature will increase

freeze box space temperature will increase

minimum chill box evaporator coil temperature will increase

minimum freeze box evaporator coil temperature will increase

551

If the valve labeled "D" in the illustration is a discharge service valve, what will the port labeled "7" be connected to?

to the line connected to the condenser inlet

to the line connected to the condenser outlet

to the inlet of the compressor

to the outlet of the compressor

552

If the valve labeled "D" in the illustration is a suction service valve, what will the port labeled "7" be connected to?

to the line connected to the evaporator inlet

to the line connected to the evaporator outlet

to the inlet of the compressor

to the outlet of the compressor

553

If the water failure switch should fail to shut down the refrigeration compressor, the refrigerant pressure will build up in the high pressure side of the system to the point where which of the following would happen FIRST?

compressor discharge valves would be damaged

condenser tubes would rupture

system relief valve would open

high pressure cutout switch would stop the compressor

554

If there is a "large" release of R-134a refrigerant gas in a confined area, which of the following statements would be true?

safety goggles and lined butyl gloves would be required before entering the space

a self-contained breathing apparatus (SCBA) would be required before entering the space

an explosive atmosphere would be created

dust or particle masks would be required before entering the space

555

If there is a sudden drop in the capacity of a reciprocating air compressor, you should check for .

broken compressor valves

worn piston rings or cylinder liners

excessive compressor speed

a defective pressure switch

556

If water were a semisolid, the linear distance a propeller would advance in one revolution is the .

blade thickness fraction

mean width ratio

pitch

skew back factor

557

If when observing the troublehsooting indicators of a mechanical refrigeration system, you ascertain that the system has a significant leak resulting in a loss of refrigerant, what should be your FIRST action?

recover the refrigerant

charge the system

look for traces of oil to pinpoint the leak

evacuate the system

558

If you are given the job of adding hydraulic fluid to a mooring winch, and are not certain as to the type of fluid to use, you should .

add fluid that is the same color as the fluid in the reservoir

add turbine oil because it is always a good substitute

add any oil that has the same viscosity as the hydraulic fluid

check the winch manufacturer's instruction book

559

If you attempt to tighten a leaking hydraulic fitting with pressure on the system, you will .

be successful every time

find that the pressure will prevent the components from being tightened

cause the system to vibrate

dislodge any scale in the tubing, and it will damage the system

560

If you find a refrigerant leak while using a halide torch, what will happen to the flame as the exploring tube approaches the leak?

it will change from blue to orange

it will change from green to blue

it will change from blue to green

it will stay blue

561

If you find the pressure of a refrigeration system containing a Class I or Class II refrigerant to be opened for the accomplishment of repairs is 0 psig, what must be done?

only recover the vapor refrigerant

only recover the liquid refrigerant in the system

recover liquid and vapor refrigerant and have it reclaimed

do not attempt to recover the refrigerant and repair the leak before pulling a vacuum on the system

562

If you install a hydraulic hose on a unit and fail to leave sufficient room for expansion, which of the following problems will develop?

The hose may pull loose from its fittings.

The components connected by the hose will be damaged.

The hydraulic unit will fail to acquire any power.

The hydraulic fluid will overheat and breakdown.

563

If you install a new hydraulic hose in a hydraulic system, the hose must be long enough to allow for contraction to prevent .

failure of the hydraulic hose connection

excessive flow through the line

friction in other areas of the hydraulic system

overheating of the hydraulic fluid

564

If you mistakenly change from a lower pour point lubricant to a higher pour point lubricant in a refrigeration system, what will be the result?

compressor lubrication will be improved

oil will not leave the crankcase

compressor valves will be damaged

oil may congeal in the evaporator

565

If you suspect that a gage is sticking and giving an inaccurate reading, you should .

blow out the gage line with compressed air

tap the gage body with a wrench

remove the gage bezel and slightly move the needle

replace the gage or have it calibrated

566

If you turn the adjusting screw clockwise of a spring-loaded, internal pilot, pressure reducing valve, you will .

compress the adjusting spring against the diaphragm

release spring tension from the diaphragm

increase steam pressure to the reducing valve

decrease spring tension in the main valve

567

If you turn the handwheel clockwise of a spring-loaded, internal pilot, reducing valve, you will .

compress the adjusting spring against the diaphragm

release spring tension from the diaphragm

increase steam pressure to the reducing valve

decrease spring tension in the main valve

568

If your ship is experiencing slow, erratic, or no pitch response to normal CPP system commands, you would suspect a fault in the .

high pressure air supply

pneumatic clutch

electrohydraulic servo

feedback potentiometer

569

If your skin comes in contact with liquid ammonia refrigerant, what should be your immediate reaction?

contact physicians health care

apply an antibacterial ointment

flush the affected area with water

remove all necessary clothing

570

Immediately before the actual process of adding oil to a compresssor cranckase is started, the oil charging hose should be properly prepared. How is this done?

the hose should be purged with refrigerant vapor

the hose should be purged with nitrogen gas

the hose should be cleaned with an approved solvent

the hose should be baked in an oven

571

In a direct expansion type multi-box refrigeration system, the compressor is set up to cycle on and off by the action of what device?

termostatic expansion valve

high pressure cutout

king solenoid valve

low pressure cutout switch

572

In a direct expansion type refrigeration system, an externally equalized thermal expansion valve in installed in which of the following situations?

when the refrigerant pressure drop through the evaporator coil is less than 4 spig

when the air pressure drop across the evaporator is less than 4" of water column

when the refrigerant pressure drop through the evaporator coil exceeds 4 psig

when the air pressure drop across the evaporator exceeds 4" of water column

573

In a dry-type direct expansion refrigeration evaporator, what is true concerning the evaporator coils?

the coils are covered on the outside with insulation

the coils are coated on the inside with insulation

the coils are surrounded on the outside by air

the coils are surrounded on the outside by refrigerant

574

In a fixed displacement axial piston hydraulic motor, the speed is varied by .

regulating the ratio between torque and speed via the torque limiter at the motor

directing the motor output flow through a bypass line

maintaining a constant flow and pressure input

controlling the input flow rate

575

In a hydraulic system using the device illustrated, the high pressure return is provided by .

A

B

C

D

576

In a large refrigeration system having more than one evaporator, a king solenoid valve should be installed in what location?

just after the receiver

before the condenser

between the condenser and receiver

before the back pressure regulating valve

577

In a longitudinally framed ship, the longitudinal frames are held in place and supported by athwart ship members called .

stringers

web frames

pillars

brackets

578

In a low pressure air compressor, the loss of volumetric efficiency normally results from .

adiabatic compression in the intercooler

heating of the air leaving the cylinders

inaccurate valve timing

constant enlargement of the clearance expansion volume

579

In a low pressure refrigeration system, excessive running of the purge recovery unit generally indicates which probable condition?

faulty purge system vent valve

overcharged system

system leaks on the low side

system leaks on the high side

580

In a low-pressure centrifugal chiller, what is meant by the term 'high efficiency purge unit?'

Those purge units which discharge the highest percentage of refrigerant with the air being removed.

Those purge units which discharge very little refrigerant with the air being removed.

Those purge units which draw very little electrical power.

Those purge units which need the least amount of on-going maintenance.

581

In a mechanical refrigeration system, in addition to the high and low side pressure differential, what is the amount of refrigerant admitted to the evaporator directly related to?

the degree of opening of the king solenoid valve

the degree of opening of the water regulating valve

the degree of opening of the box solenoid valve

the degree of opening of the expansion valve

582

In a multi-evaporator refrigeration system, a solenoid valve is installed in the liquid line prior to what device?

the receiver

each expansion valve

the condenser

the oil separator

583

In a multiple-box refrigeration plant, when the temperature in a walk-in box rises above the cut-in point of the box thermostat, which of the listed actions should occur FIRST?

The thermal expansion valve will close.

The compressor will start.

The box solenoid valve will open.

The automatic defrost timer will activate.

584

In a pneumatic automation system, a unit producing a signal to govern the position of the controller of the measured variable, relative to the value of the measured variable, is said to have .

reset action

proportional action

two position action

rate action

585

In a proportional controller, the term "offset" refers to the difference between the:

control point and setpoint

control point and proportional band

deadband and setpoint

deadband and proportional band

586

In a radial piston pump, reversal and control of fluid flow are accomplished by moving the .

central valve

radial plunger

floating ring

cylinder body

587

In a refigeration system, once the gage manifold hoses are attached to the compressor service valve connections and properly purged, what should be the status of the manifold valves and the service valves when the purpose for attachment is to read system pressures?

both manifold hand valves should be open and the compressor service valves should both be front-seated

both manifold hand valves should be open and the compressor service valves should both be back-seated

both manifold hand valves should be closed and the compressor service valves should be cracked-off their back seats

both manifold hand valves should be open and the compressor service valves should be cracked-off their back seats

588

In a refrigeration plant, what is one vital purpose of the receiver?

cool the refrigerant gas

superheat the refrigerant liquid

store the refrigerant charge

condense the refrigerant

589

In a refrigeration system equipped with a reciprocating compressor and a water cooled condensing unit, leaking compressor discharge valves will result in what operating condition?

high suction pressure and high discharge pressure

high suction pressure and low discharge pressure

low suction pressure and low discharge pressure

low suction pressure and high discharge pressure

590

In a refrigeration system featuring low-side pumpdown prior to the automatic shut down of the compressor, the temperature of the refrigerated space is controlled by the action of a thermostat wired to what device?

suction line solenoid

thermostatic expansion valve

liquid line box solenoid

low pressure cutout switch

591

In a refrigeration system fitted with a water-cooled condenser, what is the purpose of the water regulating valve?

to maintain a constant condenser cooling water pressure

to maintain a constant head pressure

to maintain a constant suction pressure

to maintain a constant discharge gas temperature

592

In a refrigeration system that is not protected by a water failure switch, if the cooling water to the condenser fails, what will be the result for protective purposes?

the box temperature solenoid valve will close initiating a pumpdown

the expansion valve will close due to high superheat

the compressor will shutdown by the action of the high pressure cutout switch

the king valve will open

593

In a refrigeration system, at what component does the refrigerant absorb the latent heat of vaporization?

compressor

condenser

receiver

evaporator

594

In a refrigeration system, from what location would air and non-condensible gases be removed?

expansion valve equalizer connection

compressor oil fill connection

the bottom of the receiver drain connection

the top of the condenser purge connection

595

In a refrigeration system, prolonged foaming of the crankcase oil may cause what condition to occur?

the expansion valve to overfeed

the compressor to knock

the water regulating valve to fail

the crankcase drains to plug

596

In a refrigeration system, silica gel is found in what component?

condenser/receiver

dehydrator or combination filter/drier

moisture indicating liquid line sight glass

compresor suction scale trap

597

In a refrigeration system, the amount of superheat absorbed by the refrigerant flowing through the evaporator coil is adjusted at what device?

the box solenoid

the box thremostat

the low pressure cut-out

the thermal expansion valve

598

In a refrigeration system, the bulb for the thermal expansion valve is always located where?

in the middle of the evaporator coils

at the evaporator coil outlet

at the evaporator coil inlet

at the beginning of the bottom row of the evaporator coils

599

In a refrigeration system, the condenser cooling water regulating valve is directly controlled by changes in what parameter or condition?

temperature of the inlet cooling water

compressor discharge pressure

amount of refrigerant in the system

temperature of the refrigerant after expansion

600

In a refrigeration system, the heat normally producing the flash gas at the thermostatic expansion valve, is obtained by what means?

the hot gas bypass connection at the threeway valve

the portion of liquid refrigerant which does not flash

exposure to the high ambient temperature within the coil

exposure to the high ambient temperature of the cooled space

601

In a refrigeration system, the pressure within the power element of a thermostatic expansion valve depends directly upon what factor?

temperature in the box

temperature of the evaporator coil outlet

compressor suction pressure

heat transferred from the saturated liquid in the evaporator

602

In a refrigeration system, the push-pull technique can be used for the recovery of the refrigerant in what state?

both liquid and vapor

liquid only

vapor only

should never be used with low pressure systems

603

In a refrigeration system, the thermal expansion valve sensing bulb is properly secured and insulated at what location?

near the evaporator coil outlet

near the evaporator coil inlet

on the liquid line strainer

at the solenoid valve outlet

604

In a refrigeration system, the valve shown in the illustration is used for what purpose?

thermostatic expansion valve

evaporator pressure regulating valve

head pressure regulating valve

suction pressure regulating valve

605

In a refrigeration system, what component is installed directly downstream of the thermal expansion valve?

evaporator coil

receiver

compressor

box solenoid valve

606

In a refrigeration system, where multiple evaporators are operating at different temperatures, and serviced by a single compressor and condenser, the control of individual evaporator coil temperature minimums should be carried out by adjustment of which individual valve?

thermostatic expansion valve superheat setting

evaporator pressure regulating valve pressure setting

thermostatic expansion valve maximum pressure setting

box thermostat temperature setting

607

In a shell-and-tube type hydraulic fluid cooler, the amount of heat transferred from the hydraulic fluid to the cooling water depends upon .

the temperature of the hydraulic fluid

the flow rate of both the cooling water and the hydraulic fluid

the temperature of the cooling water

all of the above

608

In a shipboard potable water system, which of the following symptoms would indicate that the hot water circulating pump had failed?

The hot water return manifold would be warmer than normal.

The average temperature of the hot water heater would be above normal.

The water faucets would operate at a lower pressure.

Below normal water temperature would be discharged for a long period before hot water would appear at the hot water faucets.

609

In a simple saturated cycle, an R-134a refrigeration system has a high side pressure of 123.58 psig and a low side pressure of 1.9334 psig. Using this information and the data shown in the illustration, determine the refrigeration effect per pound of refrigerant circulated, neglecting any subcooling or superheating effects.

55.41 BTU/lb

70.39 BTU/lb

90.77 BTU/lb

105.75 BTU/lb

610

In a simple saturated cycle, an R-134a refrigeration system has a high side pressure of 96.626 psig and a low side pressure of 9.0751 psig. Using this information and the data shown in the illustration, determine the refrigeration effect per pound of refrigerant circulated, neglecting any subcooling or superheating effects?

62.33 BTU/lb

73.44 BTU/lb

88.29 BTU/lb

99.41 BTU/lb

611

In a six month period, the illustrated device has needed to be replaced twice due to excessive grinding of part "E". Which of the listed aids might assist in reducing this problem?

Use a softer material for part "D".

Increase the contact surface area of part "F".

Increase the contact surface area of part "E".

Increase the thickness of the cover gasket at point "H".

612

In a small appliance using HFC-134a you would expect to see the greatest temperature drop across what system component?

evaporator

receiver

compressor

condenser

613

In a small refrigeration appliance using HFC-134a you would expect to see the greatest temperature drop across which system component?

evaporator

thermal expansion valve

compressor

receiver

614

In a spring opposed, diaphragm-type, pneumatic power unit shown in the illustration, the force exerted on the spring is equal to the air pressure multiplied by the .

area of the internal plate

number of spring coils

area of the diaphragm

tension rating of the spring

615

In a two stage centrifugal air conditioning system, the liquid refrigerant passes through the condenser directly to what component?

evaporator

chiller

economizer

expansion valve

616

In a typical hydraulic steering gear system, as the designated rudder angle is approaching the helm command angle, what will be the reaction of the steering gear follow-up mechanism?

The follow-up mechanism will be compensating with an increasing signal to the hydraulic pump tilt box controls.

The follow-up mechanism will be inactive as long as rudder angle error exists.

The follow-up mechanism will send a hydraulic signal back to the helm as the rudder angle is achieved

The follow-up mechanism will be compensating with an decreasing signal to the hydraulic pump tilt box controls.

617

In a typical hydraulic system, a baffle is installed in the reservoir to . I. insure proper lubrication of the hydraulic pump II. assist in the removal of solid contaminants entrained in the returning oil

I only

II only

Both I and II

Neither I and II

618

In a typical hydraulic system, a baffle is installed in the reservoir to . I. provide a critical reduction in free surface effect of the hydraulic pump II. retard flow of oil through reservoir to assist in heat removal

I only

II only

Both I and II

Neither I and II

619

In a typical hydraulic system, return lines to the reservoir are . I. terminated at or just above the normal level II. placed as far from the pump suction as possible

I only

II only

Both I and II

Neither I and II

620

In a typical hydraulic system, return lines to the reservoir are terminated below the normal oil level to prevent . I. foaming of the oil II. condensation of warm oil vapors upon return

I only

II only

Both I and II

Neither I and II

621

In a typical refrigeration system, refrigerant leaving the receiver will then flow to what system component?

evaporator coils

liquid line strainer

back pressure regulator

condenser

622

In a typical refrigeration system, where is the temperature of the refrigerant gas at the highest?

at the compressor discharge

at the compressor suction

in the expansion valve

in the receiver

623

In a vapor compression refrigeration cycle, the temperature of the liquid refrigerant experiences its greatest decrease flowing through what component?

evaporator

compressor

expansion valve

condenser

624

In a vapor compression refrigeration system with freeze, produce, and dairy boxes, along with a thaw room, a solenoid valve should be found to be installed where in the system?

immediately before each expansion valve

on the inlet side of the receiver

in the liquid line bypassing the expansion valve

in the vapor line bypassing the oil separator

625

In a vapor compression type refrigeration cycle, the refrigerant temperature decreases the most when passing through which system component?

evaporator

condenser receiver

compressor

expansion valve

626

In a water cooled stern tube, a slight leakage of water across the packing gland is provided to .

flush all dirt and grit from the gland

flush all dirt and grit from the bearing staves

keep the gland packing cool

keep the stern tube fair water cool

627

In a water-cooled ship's stores refrigeration plant using a high pressure refigerant as defined under the EPA Clean Air Act rules, which of the following applications would be appropriate for a permanently intalled compound pressure gauge?

compressor suction pressure

compressor discharge pressure

lube oil pump discharge pressure

condenser cooling water supply pressure

628

In accordance with Coast Guard Regulations (46 CFR), a steam propelled cargo vessel over 25 gross tons may have a Certificate of Inspection issued for .

one voyage only

a specific period of time to cover a described situation

a time period not exceeding 5 years

all of the above, depending upon the pertinent circumstances

629

In accordance with Coast Guard Regulations (46 CFR), a steam propelled cargo vessel over 25 gross tons may have a Certificate of Inspection issued for .

one voyage only

a specific period of time to cover a described situation

a time period not exceeding 2 years

all of the above, depending upon the pertinent circumstances

630

In accordance with Coast Guard Regulations (46 CFR), it is the duty of the Chief Engineer to acquire and seal a sample of fuel oil received whenever fuel oil bunkers are taken. This sample must be preserved until .

the voyage is completed

that particular supply of oil is exhausted

it can be sent ashore to the proper oil company personnel for testing and the results entered in the Oil Record Book, CG- 480

return to the first U.S. port where upon it must be sent ashore for chemical analysis and the findings submitted to the nearest Officer in Charge, Marine Inspection

631

In accordance with Coast Guard Regulations (46 CFR), the hailing port marked on the stern of a vessel indicates .

the port where the vessel is permanently documented

the place in the same marine inspection zone where the vessel was built

where one or more of the owners reside

all of the above

632

In accordance with the Coast Guard Regulations (46 CFR), which of the following situations requires an official logbook entry and is considered the responsibility of the chief engineer?

Ensuring that the emergency lighting and power systems are operated and inspected at least once in each week the vessel is navigated.

Seeing that all lifeboat winch control apparatus including motor controllers, limit switches, etc. are examined at least once in each 3 months.

Obtaining a sample of all fuel oil received on board to be used as fuel along with ascertaining all particulars such as vendor, producer, flash point, etc.

All of the above.

633

In addition to a pressure gage and a relief valve, an air receiver should be fitted with a .

sight glass and manhole

thermometer and sight glass

thermometer and manhole

drain connection

634

In addition to adjusting the box thermostat, for a direct expansion multiple-evaporator refrigeration system, a chill box may be converted to a freeze box by performing what action?

controlling the feed with the hand expansion valve

throttling the compressor suction isolation valve

bypassing the box solenoid valve

bypassing the back pressure regulating valve

635

In addition to moisture, a suction line dehydrator installed in a system after a burnout has occurred is designed to remove what additional substance?

damaged refrigerant

acids

noncondensable gases

refrigerant oil

636

In addition to pressure, most compound and standard pressure gauges used for refrigeration service are also provided with a scale indicating what parameter?

saturated refrigerant temperature

superheated refrigerant temperature

subcooled refrigerant temperature

absolute pressure

637

In addition to removing water from a refrigerant and neutralizing acids, most dehydrators also effectively remove what other substance?

solid impurities

air

dichlorodifluoromethane

dessicant

638

In addition to the drive belt itself, a V-belt that is tensioned too tight will cause excessive wear to what other drive component?

the shaft of the prime mover

the compressor drive pulley

motor shaft and compressor main bearings

the prime mover drive pulley

639

In addition to the indicated gauge pressure, what other information is presented on the compound gauge for the hypothetical refrigerant illustrated?

the actual temperature of the refrigerant at the point of measurement

the saturation temperature of the refrigerant that corresponds to the gauge pressure at the point of measurement

the absolute pressure of the refrigerant at the point of measurement

the metric pressure equivalent of the refrigerant at the point of measurement

640

In addition to the main outermost scale on the low side compound gage fitted to the portable service manifold, there are often one or more other scales on the face of the gage. What are these other scales?

actual pressure scales for different refrigerants

saturation pressure scales for varying ambient temperatures

actual temperature scales for different refrigerants

saturation temperature scales for different refrigerants

641

In air has 100% relative humidity, how would the wet bulb temperature relate to the dry bulb temperature?

be above the dry bulb temperature

be below the dry bulb temperature

be the same as the dry bulb temperature

be above the dry bulb temperature, but below the saturation temperature

642

In an air conditioning system, low discharge head pressure associated with a reciprocating compressor can be the result of what condition?

leaky suction valves

insufficient cooling water to the condenser

air in the evaporator coils

air in the condenser

643

In an air conditioning system, moisture is removed from the air by what means?

filters

separators

ducted traps

cooling coils

644

In an air conditioning system, what is the name of the chamber where the duct-work originates?

exhaust chamber

plenum chamber

intake chamber

vapor chamber

645

In an automated control system, which of the following statements would apply to any type of closed loop system?

The manipulated variables are adjusted only from the input demand signals without monitoring the outlet conditions or variables.

Another term commonly used in conjunction with this type of system is 'feed forward.'

The controlled variable must always deviate from its set point before any corrective action is initiated by the controller.

In order for a system to fall under the category of closed loop control, there should be no adjustments required to be made manually by the operator.

646

In an automatic flow controller, the factor by which the magnitude of the flow error signal has been increased to drive the final valve controller is referred to as:

bias

gain

feedback

offset

647

In an automation system, increasing or decreasing the loading pressure by a set amount is known as .

positioning

proportioning

biasing

controlling

648

In an automation system, the effect of a control action sensed by a controller is known as .

command input

set point signal

output

feedback

649

In an electro-hydraulic steering gear system, when will the variable displacement pump be placed on stroke?

When the helm is at any angle other than amidships.

When the six-way valve is opened.

When the ram relief valves lift.

When the rudder angle is different from the position of the helm.

650

In an electro-hydraulic steering gear, any change in relative position between the synchronous receiver and the follow- up gear will result in .

the pump going to full stroke

closing of the six-way valve

driving the rams up against the stops

a corresponding slowing or increasing of the pumped flow rate

651

In an electro-hydraulic steering system, damage due to rudder shock is prevented by .

buffer springs

relief valves

oil flowing through the pumps

dashpots

652

In an electro-hydraulic steering system, rudder movement is maintained in close synchronization with the steering wheel position by means of the .

trickwheel

follow-up control

six-way valve

Rapson slide

653

In an electro-hydraulic steering system, rudder shock is limited by .

a differential gear

return springs

a hydraulic accumulator

relief valves

654

In an emergency, the electro-hydraulic steering units can be directly controlled by the .

trick wheel

rapson slide

follow-up gear

receiver unit

655

In an operating refrigeration system low on refrigerant, what will be the indication as viewed in the liquid line sight glass?

it will be clear

it will be blue

it will be light green

it will show bubbles

656

In an operating, water-cooled, multi-box refrigeration system, both low discharge and high suction pressures are being simultaneously experienced. The probable cause for this condition is which of the following?

overcharge of refrigerant in the system

fouled shell-and-tube condenser

improper superheat adjustment on the low side

discharge relief valve leaking back to the suction side

657

In application, which of the listed sealing devices is most similar to an O-ring?

V-ring

Cup seal

U-ring

Quad ring

658

In checking the level of a tank, three pneumercator readings have been taken. If each reading is higher than the last, this indicates that .

excessive charging air was supplied

insufficient charging air has been supplied

the relief valve is sticking

the tubing between the tank and the gauge has a leak

659

In consulting the R-134a pressure-temperature chart shown in the illustration, what would be the most likely normal running suction pressure for a reach-in chill box, assuming the box temperature is within normal range?

2.0 psig

22.1 psig

30.7 psig

45.5 psig

660

In consulting the R-134a pressure-temperature chart shown in the illustration, what would be the most likely normal running suction pressure for a reach-in freezer, assuming the box temperature is within normal range?

2.0 psig

6.5 psig

15.0 psig

27.8 psig

661

In consulting the R-134a pressure-temperature chart shown in the illustration, what would be the most likely normal running suction pressure for an air conditioner, assuming the space temperature is within normal range?

18.5 psig

35.1 psig

45.5 psig

75.0 psig

662

In consulting the refrigerant pressure-enthalpy and mechanical refrigeration system diagrams shown in the illustration, in the direction of refrigerant flow, what letters in the pressure-enthalpy diagram correspond to points 2 and 3 on the refrigeration cycle diagram?

A to B

B to E

E to F

G to J

663

In consulting the refrigerant pressure-enthalpy and mechanical refrigeration system diagrams shown in the illustration, in the direction of refrigerant flow, what letters in the pressure-enthalpy diagram correspond to points 5 and 6 on the refrigeration cycle diagram?

A to B

B to E

E to F

F to A

664

In consulting the refrigerant pressure-enthalpy and mechanical refrigeration system diagrams shown in the illustration, in the direction of refrigerant flow, what letters in the pressure-enthalpy diagram correspond to points 7 and 8 on the refrigeration cycle diagram?

A to B

B to D

E to F

H to I

665

In consulting the refrigerant pressure-enthalpy and mechanical refrigeration system diagrams shown in the illustration, in the direction of refrigerant flow, what letters in the pressure-enthalpy diagram correspond to points 9 and 1 on the refrigeration cycle diagram?

A to B

B to E

E to F

F to A

666

In consulting the refrigerant pressure-enthalpy diagram shown in the illustration, what statement is true concerning the pressure/temperature relationship?

for every pressure, there is a corresponding temperature as long as the refrigerant is subcooled

for every pressure, there is a corresponding temperature as long as the refrigerant is saturated

for every pressure, there is a corresponding temperature as long as the refrigerant is superheated

for every pressure, there is a corresponding temperature regardless of the condition of the refrigerant

667

In consulting the refrigerant pressure-enthalpy diagram shown in the illustration, what statement is true concerning the saturated liquid line?

it is the line corresponding to the 0% quality line, representing 0% vapor and 100% liquid

it is the line corresponding to the 100% quality line, representing 0% vapor and 100% liquid

it is the line corresponding to the 0% quality line, representing 0% liquid and 100% vapor

it is the line corresponding to the 100% quality line, representing 0% liquid and 100% vapor

668

In consulting the refrigerant pressure-enthalpy diagram shown in the illustration, what statement is true concerning the saturated vapor line?

it is the line corresponding to the 0% quality line, representing 0% vapor and 100% liquid

it is the line corresponding to the 100% quality line, representing 0% vapor and 100% liquid

it is the line corresponding to the 0% quality line, representing 0% liquid and 100% vapor

it is the line corresponding to the 100% quality line, representing 0% liquid and 100% vapor

669

In general, the thermal bulb for a thermal expansion valve used in a reciprocating air conditioning system is usually charged with what substance?

distilled water

the same refrigerant as the system

bees wax

mercuric sulfate

670

In hydraulics, the graphic symbol illustrated in Fig. A is used to represent a/an .

variable resistor

expansion joint

spring

flexible mount

671

In merchant ship construction, the term 'scantlings' refers to the .

factor of safety involved with the hog and sag characteristics of the hull

hull girder strength in terms of the standard model

designed size of the beams, stiffeners, and shell plating

ICE strength classification of the hull

672

In modern ship construction, high tensile steel (HTS) may be permitted in .

the sheer strake

the keel strake

the margin strake

all of the above

673

In MODU construction, a large number of watertight bulkheads results in .

increased capacity to set flooding boundaries

decreased capacity to set flooding boundaries

reduced compartmentation

greater deck load capacity

674

In MODU construction, beam brackets are triangular plates joining the deck beam to a .

bulkhead

frame

stanchion

deck longitudinal

675

In MODU construction, beams are transverse girders which provide support to .

bulkheads

deckhouse structures

decks

vertical frames

676

In multi-box refrigeration systems, the sensing bulb of the thermostatic expansion valves used on the refrigerated boxes with elevated temperatures should be located where?

in the diffuser fan inlet air stream

in the diffuser fan outlet air stream

before the back pressure regulating valve

after the back pressure regulating valve

677

In order for the hydraulic pump installed in a constant flow system to maintain adequate flow, the pump suction should .

be taken directly off the reservoir bottom without regard to filters or strainers

be arranged to develop a maximum vacuum of approximately 10" of mercury

be arranged to develop the theoretically maximum attainable vacuum

be provided with three to five 1/2 inch holes in the vertical, suction line to prevent pump starvation should the strainer become fouled

678

In order for the hydraulic system to operate with fewer contaminants from the system's operating fluid, the illustrated device may .

be increased in height with all other dimensions remaining the same

have additional baffles installed

have the horizontal submerged section of the suction line lengthed

be increased in length and have the width narrowed

679

In order for the reducing valve, shown in the illustration, to properly function, a control port is utilized between .

the underside of diaphragm "E" and the outlet

the inlet side and the outlet side

the underside of diaphragm "E" and the inlet

the top of piston "H" and the outlet

680

In order to accurately measure very low positive pressures, which of the instruments listed should be used?

Compound gage

Bourdon tube

Manometer

Deadweight gage

681

In order to achieve greater dehumidification with an air conditioning system, you should perform which of the following? I. reduce the cooling coil temperature II. increase the reheater temperature

I only

II only

Both I and II

Neither I nor II

682

In order to achieve greater dehumidification, you would adjust the air conditioning system by which of the listed means? I. reducing the chill water flow through the cooling coil II. increasing the preheater temperature

I only

II only

Both I and II

Neither I nor II

683

In order to adjust the temperature set point of the temperature regulating valve illustrated, you should adjust the device indicated by the letter .

A

B

M

L

684

In order to adjust the temperature set point of the temperature regulating valve illustrated, you should adjust the device indicated by the letter .

A

B

M

L

685

In order to assess each trainee in the performance of a practical demonstration, the assessor should .

create a unique set of subjective questions for each trainee

refer to a checklist that represents the skill process as required on board the vessel

evaluate according to their discretion, simply by their ability to "tell" when a candidate is performing well

sign off the remaining half of all skills to be demonstrated based upon the success of the first half of the skill demonstration

686

In order to assure an output near the end of its compression stroke, the pressure developed in the high pressure cylinder of a reciprocating air compressor is .

the same as the line discharge pressure

below the line discharge pressure

constant throughout the discharge period

above the line discharge pressure

687

In order to change over the main pumps shown in the illustrated steering gear, which of the components listed must be manually actuated?

"A"

"C"

Six-way valve

Motor controller on-off switches

688

In order to change the set point of the system using the illustrated device, you must .

rotate part "I" counterclockwise

change the compression of the spring located below part "H"

rotate part "E" until the operating pressure has changed by 5 psi

rotate part "D" in the direction necessary to produce the desired output pressure change in the system

689

In order to decrease the set point of the control valve as illustrated, used to regulate the output temperature of a lube oil cooler, the part labeled .

"K" must be rotated clockwise

"A" must be rotated counterclockwise

"A" must be rotated clockwise

"K" must be rotated counterclockwise

690

In order to decrease the set point of the control valve as illustrated, used to regulate the output temperature of a refrigeration condenser, the part labeled .

"K" must be rotated clockwise

"A" must be rotated counterclockwise

"A" must be rotated clockwise

"K" must be rotated counterclockwise

691

In order to distribute the side pressures over a wide area of the cylinder walls and liners, which of the listed types of pistons are used in modern low pressure air compressors?

Differential

Trunk

Barrel

Valve-in-head

692

In order to increase the set point of the control valve as illustrated, used to regulate the output temperature of a hot water heater, the part labeled .

"K" must be rotated clockwise

"A" must be rotated counterclockwise

"A" must be rotated clockwise

"K" must be rotated counterclockwise

693

In order to increase the set point of the control valve as illustrated, used to regulate the output temperature of a refrigeration condenser, the part labeled .

"K" must be rotated clockwise

"A" must be rotated counterclockwise

"A" must be rotated clockwise

"K" must be rotated counterclockwise

694

In order to increase the set point of the control valve illustrated to regulate the controlled temperature at the bulb (J), the part labeled .

"K" must be rotated clockwise

"A" must be rotated counterclockwise

"A" must be rotated clockwise

"K" must be rotated counterclockwise

695

In order to prevent overheating of the packing in the stern tube stuffing box, .

the gland is properly adjusted to permit a slight leakage of sea water

stave-type rubber seals are used

cooling water is supplied from the fresh water cooling system

the gland nuts must be tightly taken up to prevent any water leakage

696

In order to recognize the amount of anchor chain paid out, specific portions of the chain are color coded and wrapped with wire. A red painted detachable line would be found between the .

number 1 and 2 shots of chain

number 2 and 3 shots of chain

number 3 and 4 shots of chain

all of the above

697

In order to recognize the amount of anchor chain paid out, specific portions of the chain are color coded and wrapped with wire. The first shot of chain is painted .

white on the detachable link and red on each link to either side of the detachable link

white on the detachable link and white on each link to either side of the detachable link

red on the detachable link and red on each link to either side of the detachable link

red on the detachable link and white on each link to either side of the detachable link

698

In order to recognize the amount of anchor chain paid out, specific portions of the chain are color coded and wrapped with wire. The second shot of the chain is painted .

white on the detachable link

red for two links on either side of the detachable link

white for two links on either side of the detachable link

red on the detachable link

699

In order to recognize the amount of anchor chain paid out, specific portions of the chain are color coded and wrapped with wire. The third shot of chain should have .

three turns of wire wrapped around the detachable link

three turns of wire wrapped around the stud of the third link on each side of the detachable link

three turns of wire wrapped around the stud of the link on each side of the detachable link

one turn of wire wrapped around the stud of the third link on each side of the detachable link

700

In preparation for repairing a leaking refrigeration system normally containing 50 lbs.of a class II refrigerant, it has been determined that the system pressure is presently 0 psig. In terms of refrigerant recovery, which of the following statements is true?

recover the refrigerant as a vapor only

recover the refrigerant first as a vapor, then as a liquid

recover the refrigerant first as a liquid, then as a vapor

do not attempt to recover any refrigerant

701

In reclaiming recovered refrigerant, which type of contamination will the reclamation process be unable to separate?

mixed refrigerants

acid

moisture

air

702

In reference to air conditioning, when air attains the maximum amount of moisture it can hold at a specific temperature, what term best describes the air?

superheated

saturated

condensed

convected

703

In refrigeration systems with multiple evaporators, the metering of refrigerant to each refrigerated space evaporator is accomplished by what device?

the king valve

the individual thermal expansion valves

the individual box solenoid valves

the individual back pressure regulating valves

704

In ship construction, structural hull members installed athwart ship are .

deck beams

stringers

girders

breasthooks

705

In ship construction, the hull frame members extending athwart ship are called .

deck frames

stringer frames

longitudinal frames

transverse frames

706

In ship construction, the shell plating is arranged in strakes and assigned letter designations. If the strakes were lettered "A" through "K", the "K" strake will be .

at the turn of the bilge

the keel strake

the drop strake

the sheer strake

707

In ship construction, the shell plating is arranged in strakes, with four of the strakes being specifically identified by name. The strake next to the keel is identified as the .

keel strake

garboard strake

bilge strake

sheer strake

708

In ship construction, the strakes are given letter designations beginning with the letter 'A.' The "A" strake is adjacent to the .

deck edge strake

keel

turn of the bilge strake

sheer strake

709

In ship construction, which of the listed strengthening members act to support the decks?

Pillars

Girders

Bulkheads

All of the above

710

In terms of humidity, when air is at its dew point, which of the following is true?

the air is at its lowest absolute humidity

the air is at its lowest relative humidity

the air is at its highest absolute humidity

the air is at its highest relative humidity

711

In terms of the conditions associated with the boiling process, what impact does oil in solution mixed with the liquid refrigerant have?

higher boiling temperature for a given pressure than does a pure refrigerant

lower boiling temperature for a given pressure than does a pure refrigerant

boiling pressure equal to that of a pure refrigerant at a given pressure

boiling point will not be affected by entrained oil

712

In terms of the running of a refrigeration compressor, what is meant by the term "short-cycling"?

frequently grounding out

frequently starting and stopping

running too fast

running too slow

713

In the design of hydraulic piping and equipment consideration is given to minimize turbulence in the hydraulic fluid, as this will cause .

molecular fluid vibration

energy losses

wide pressure variations

mechanical damage to control valves

714

In the device illustrated, if part "D" rotates clockwise then part "E" will rotate .

counterclockwise and act upon part "H"

clockwise and act upon part "H"

counterclockwise and act upon part "G"

clockwise and act upon part "G"

715

In the hydraulic anchor windlass system illustrated, if the power to the electric motor is on, but the wildcat does not turn, and pressure can not be developed on either side of the system, the probable cause is the .

replenishing pump coupling is broken

relief valve is not closing

manual transfer valve is in the wrong position for the main pump being operated

spring set point for "I" is too low

716

In the hydraulic anchor windlass system illustrated, if the power to the electric motor is on, but the wildcat does not turn, the pressure developed on either side of the system increases to half of the normal operating pressure regardless of the direction of movement in which the servo control is placed, the probable cause is the .

replenishing pump coupling is broken

relief valve is not opening

manual transfer valve is in the wrong position for the main pump being operated

spring set point for "I" is too high

717

In the hydraulic anchor windlass system illustrated, if the power to the electric motor is on, but the wildcat turns slowly or not at all, even without a load being applied, and nearly normal pressure is indicated on the high side of the system, the probable cause is that the .

replenishing pump "K" drive coupling is broken

relief valve controlled by the pilot operated directional control valve "L" is not seating properly

manual transfer valve is in the wrong position for the main pump being operated

pressure from the brake release cylinder "E" has failed to bleed off when the primary valve unit "J" is placed in the operating position

718

In the hydraulic anchor windlass system illustrated, pressure relief of the main pressure piping is provided by .

D

E

L

M

719

In the hydraulic anchor windlass system illustrated, pressurized fluid flow is provided to the main system for automatic replenishment and to .

provide fluid flow for the horsepower limiter unit operation

engage the spring brake

shift valve "L" to line up the fluid motor relief valve

move stored oil across the indicated filter to maintain the oil in a water free condition

720

In the hydraulic anchor windlass system illustrated, pressurized fluid flow to provide rotation of the wildcat is produced by .

A

F

J

K

721

In the hydraulic anchor windlass system illustrated, replenishment pump fluid flow is provided to the main system for automatic replenishment and to .

release the spring brake

provide actuating fluid flow to the horsepower torque limiter

shift valve "L" to line up the fluid motor relief valve

move stored oil across the indicated filter to maintain the oil in a water free condition

722

In the hydraulic anchor windlass system illustrated, replenishment pump fluid flow is provided to the main system for automatic replenishment and to .

release the spring brake

provide actuating fluid flow to the main pump tilt box control

shift valve "L" to line up the fluid motor relief valve

provide actuating fluid flow to the winch motor tilt box control

723

In the hydraulic anchor windlass system illustrated, the main pressure relief valve opens as the load increases its strain on the system. The probable cause is the .

replenishing pump discharge check valves are continuously open

relief valve control shuttle has shifted to the wrong position during windlass operation

manual transfer valve is in the wrong position for the main pump being operated

spring set point "I" is set too high for normal loads

724

In the hydraulic crane circuit illustrated, what is the function of the component labeled #18?

Provide additional control when lowering the boom.

Provide additional control when swiveling the platform.

Control the lowering speed of the winch cable.

Provide a pressure relief if the boom becomes overloaded.

725

In the hydraulic crane circuit illustrated, which would be the correct hydraulic configuration required to raise the boom?

activate directional valve 9 and shift spool valve to area 3

activate directional valve 9 and shift spool valve to area 1

activate directional valve 8 and shift spool valve to area 3

activate directional valve 8 and shift spool valve to area 1

726

In the hydraulic schematic illustrated, the pump symbol indicates the use of a .

constant flow gear type pump

constant flow pump of indefinite construction

constant flow screw type pump

bi-directional rotating constant flow pump

727

In the hydraulic transmission shown in the illustration, the "B" end is a .

low pressure hydraulic pump

variable displacement hydraulic pump

constant speed hydraulic motor

fixed displacement hydraulic motor

728

In the illustrated heating system, what is the maximum height the heater should be mounted above the deck?

5"

6"

12"

24"

729

In the illustrated multi-evaporator refrigeration system associated with the common and chill box circuit, refrigerant exists as a subcooled liquid between what two components?

B and 29

B and 23

A and 29

B and 37

730

In the illustrated multi-evaporator refrigeration system associated with the common and freeze box circuit, refrigerant exists as a subcooled liquid between what two components?

B and 29

B and 23

A and 29

B and 37

731

In the illustrated R-134a high pressure centrifugal chiller refrigerant flow circuit, by what means is the heat removal capacity of the system regulated?

controlling the condenser water flow through the condenser

controlling the compressor gas flow via the inlet guide vanes

controlling the chilled water flow through the cooler

controlling the hot gas bypass flow directly from the compressor discharge to the cooler

732

In the illustrated R-134a high pressure centrifugal chiller refrigerant flow circuit, what is the functional purpose of the refrigerant flowing as seen through the moisture indicator (item #3)? I. functions as a cooling medium for the hermetically sealed compressor drive motor II. functions as a cooling medium for the lubricating oil

I only

II only

Both I and I

Neither I nor II

733

In the illustrated R-134a high pressure centrifugal chiller refrigerant flow circuit, what is the functional purpose of the turbine? I. functions as a metering/expansion device maintaining a pressure differential between the high and low pressure sides of the system II. functions to deliver power to the compressor by aiding the electric drive motor

I only

II only

Both I and I

Neither I nor II

734

In the illustrated refrigeration system, what is the proper name for the component labeled "A"?

accumulator

compressor

filter drier

condenser

735

In the illustrated schematic, the device used to replace the six-way valve, as found on many older type steering gears, is the component labeled as .

"A"

"B"

"F"

"H"

736

In the illustrated steam pressure reducing valve, the purpose of the item labeled "C" is to .

provide sensing of downstream pressure to the control diaphragm

equalize pressure above and below the power piston

equalize pressure above and below the pilot valve

provide a supply conduit of actuating steam for the power piston

737

In the illustrated system, what pressure will be indicated on the gage if the load (x) is 10,000 lb (4,450 kg) and the piston area (y) is 10 sq. in (64.5 sq cm.)?

10,000 psi (703 kg/cm2)

100,000 psi (7,030 kg/cm2)

100 psi (7.03 kg/cm2)

1,000 psi (70.30 kg/cm2)

738

In the illustrated system, what pressure will be indicated on the gage if the load (x) is 10,000 lbs (4540 kg) and the piston area (y) is 8 sq. in (51.6 sq. cm)?

10,000 psi (703 kg/cm2)

80,000 psi (5,624 kg/cm2)

1,250 psi (87.88 kg/cm2)

156.25 psi (10.89 kg/cm2)

739

In the illustrated system, what pressure will be indicated on the gage if the load (x) is 500 lbs (227 kg) and the piston area (y) is 0.63 sq. in. (4 sq. cm.]

318 psi (22.63 kg/cm2)

796 psi (55.96 kg/cm2)

1,263.49 psi (88.8 kg/cm2)

785 psi (55.19 kg/cm2)

740

In the illustrated system, what pressure will be indicated on the gage if the load (x) is 632 lb (286.9 kg) and the piston area (y) is 1.5 sq. in (9.6 sq. cm)?

255 psi (17.93 kg/cm2)

565 psi (39.72 kg/cm2)

942 psi (66.22 kg/cm2)

424 psi (29.81 kg/cm2)

741

In the illustrated system, what pressure will be indicated on the gage if the load (x) is 702.68 lbs (319.02 kg) and the piston area (y) is 1.117 sq. in (7.21 sq. cm)?

785 psi (55.19 kg/cm2)

353 psi (24.82 kg/cm2)

629 psi (44.22 kg/cm2)

283 psi (19.89 kg/cm2)

742

In the illustrated system, what pressure will be indicated on the gage if the load (x) is 758.7 lbs (344 kg) and the piston area (y) is 1.25 sq. in (8.0 sq. cm)?

611 psi (42.95 kg/cm2)

471 psi (33.11 kg/cm2)

942 psi (66.22 kg/cm2)

306 psi (921.51 kg/cm2)

743

In the illustrated system, what pressure will be indicated on the gage if the load (x) is 9984 lbs (4532.7 kg) and the piston area is 12 sq. in (77.4 sq. cm)?

291 psi (20.46 kg/cm2)

832 psi (58.49 kg/cm2)

628 psi (44.15 kg/cm2)

220 psi (15.47 kg/cm2)

744

In the illustrated system, what pressure will be indicated on the gage if the load (x) is 2,530 lbs (1,148.48 kg) and the area of the piston (y) is 38 sq. in (244.8 sq. cm)?

66.66 psi (4.69 kg/cm2)

8000 psi (562.4 kg/cm2)

55.55 psi (3.91 kg/cm2)

96000 psi (6,748.8 kg/cm2)

745

In the illustrated system, what pressure will be indicated on the gage if the load (x) is 8000 lbs (3632 kg) and the piston area (y) is 8 sq. in (51.6 sq. cm)?

640 psi (44.99 kg/cm2)

1,000 psi (70.3 kg.cm2)

64,000 psi (449.2 kg/cm2)

125 psi (8.79 kg/cm2)

746

In the illustrated system, what pressure will be indicated on the gauge if the load (x) is 8000 lbs (3632 kg) and the piston area is 10 sq. in (64.5 sq. cm)?

800 psi (56.31 kg/cm2)

8,000 psi (563.1 kg/cm2)

80,000 psi (5631.0 kg/cm2)

80 psi (5.63 kg/cm2)

747

In the illustrated system, what pressure will be indicated on the gauge if the load (x) is 8000 lbs and the piston area is 10 sq. in?

800 psi

8,000 psi

80,000 psi

80 psi

748

In the illustration shown, the operating piston "H" in the valve has a larger surface area than the main valve disc to allow .

control action to be accomplished with a relatively small amount of high pressure steam

control action to be accomplished by a relatively small amount of downstream low pressure steam

complete closing of the main valve when pressure adjustments are made

free movement of the auxiliary valve "B" during a change in operating pressure

749

In the illustration, component "C" is used to replace .

the rudder position follow up gear

the necessity for manual repositioning of the six-way valve

the hydraulic telemotor receiver

the mechanical method for positioning of the variable stroke control of the main pump

750

In the illustration, control over the direction and quantity of fluid flow is attained by .

changing the eccentricity between the reaction ring and the cylinder block

moving the cylinder block off center from the reaction (floating) ring

varying the direction of rotation and speed of the prime mover

varying the prime mover direction of rotation and throttling pump output

751

In the illustration, the temperature of the hot-water heating system is controlled by the temperature of the hot water supply and the temperature of the .

central station

room being heated

hot water return

outside air

752

In the MODU construction portfolio, materials which do not conform to ASTM or ABS specifications must also include the .

chemical and physical properties of the material

name of the alternative standard or specification

the ASTM or ABS specification the material approximates

manufacturer or origin of the material

753

In the multi-evaporator refrigeration system shown in the illustration, what is the proper name for the valve labeled "29"?

chill box solenoid valve

chill box evaporator pressure regulating valve

chill box thermostatic expansion valve

freeze box thermostatic expansion valve

754

In the multi-evaporator refrigeration system shown in the illustration, what is the proper name for the valve labeled "37"?

freeze box solenoid valve

freeze box evaporator pressure regulating valve

chill box thermostatic expansion valve

freeze box thermostatic expansion valve

755

In the normal operation of a refrigeration system, when the refrigeration compressor cycles "off", the thermal expansion valve will react in what manner?

immediately open wide

immediately completely close

close to a preset minimum opening

respond according to operating forces acting on the valve

756

In the operation of a proportional-plus-reset controller, the proportional action . I. aids the reset action during increasing error transients II. and the reset action are completely independent of one another

I only

II only

Both I and II

Neither I nor II

757

In the operation of a proportional-plus-reset controller, the proportional action . I. and the reset action are completely independent of one another II. opposes reset action during decreasing error transients

I only

II only

Both I and II

Neither I nor II

758

In the operation of a proportional-plus-reset controller, the proportional action . I. opposes the reset action during decreasing error transients II. aids the reset action during increasing error transients

I only

II only

Both I and II

Neither I nor II

759

In the order of the direction of flow, the low pressure side of a refrigeration system is considered to exist between what two components?

expansion valve to the compressor

receiver to the expansion coil

expansion valve to the evaporator

condenser to the expansion valve

760

In the order of the direction of flow, which of the listed components is considered to separate the high pressure side of a refrigeration cycle from the low pressure side of the cycle?

The condenser and the expansion valve

The king valve and the solenoid valve

The compressor and the expansion valve

The condenser and the solenoid valve

761

In the presence of an open flame or hot surfaces, chlorinated fluorocarbon refrigerants decomposes and form what chemical substance?

petroleum crystals

phosgene gas

water vapor

carbon monoxide

762

In the radial piston pump shown in the illustration, oil will enter the cylinder as the piston travels from position .

1 to position 2

2 to position 3

3 to position 4

4 to position 1

763

In the refrigeration system shown in the illustration, what component is the chill box thermal expansion valve?

"23"

"27"

"28"

"29"

764

In the refrigeration system shown in the illustration, which of the valves indicated should be used to purge the system of air and non-condensable gases?

"5"

"6"

"11"

"17"

765

In the refrigeration system, a shortage of refrigerant is indicated by which of the following?

the compressor short cycling on high pressure cut out switch

high suction pressure

high head pressure

bubbles in the sight glass

766

In the spring-loaded pressure reducing valve illustrated, the auxiliary valve "D" is closed by .

diaphragm "E"

mechanical linkage

a spring

high pressure steam

767

In the spring-loaded pressure reducing valve illustrated, what would cause the auxiliary valve "D" to close?

A decrease in the valve outlet pressure.

A decrease in the valve inlet pressure.

Raising adjusting screw "G".

All of the above.

768

In the spring-loaded, steam pressure, reducing valve shown in the illustration, if the downstream pressure falls below a preset value .

spring "A" will be compressed

valve "D" will open

diaphragm "E" will deflect downward

all of the above

769

In the spring-loaded, steam pressure, reducing valve shown in the illustration, the high pressure steam .

acts to close the main valve "K"

acts to open the auxiliary valve "D"

acts directly on the lower part of the main piston "H"

bleeds pressure off the controlling diaphragm "E" via the high pressure port "C"

770

In the steering gear system shown in the illustration, if the maximum working pressure is applied to the face of the ram, the total force on one piston will be .

209,230 lbs.

836,920 lbs.

836,920 in. lbs.

24,000,000 in. lbs.

771

In the steering gear unit shown in the illustration, which of the actions listed will occur as 'left rudder' is being attained?

Ram cylinder "A" is under hydraulic pressure.

Ram cylinder "H" is relieving hydraulic pressure.

Ram cylinder "D" is under hydraulic pressure.

All of the above.

772

In the system illustrated, which of the following readings should be indicated on the pressure gage, if the load (x) is 8000 lbs (3632 kg) and the piston area (y) is 10 sq. in (64.5 sq. cm)?

80 psi (5.63 kg/cm2)

800 psi (56.31 kg/cm2)

8,000 psi (563.1 kg/cm2)

80,000 psi (5631 kg/cm2)

773

In what room condition would a lower thermostatic temperature setting will be necessary to provide a comfort level?

where low relative humidity is maintained

where triple banded squirrel cage fans are used

where air circulation is a maximum

where high relative humidity is maintained

774

In which of the following lines is an oil separator most likely to be?

suction line

discharge line

hot gas bypass line

liquid line

775

In which of the listed hydraulic system components could an O-ring seal be satisfactorily used in providing a seal?

High pressure pump shaft casing

Low pressure pump shaft casing

Linear actuator without nylon insert

Relief valve spool

776

In which of the listed hydraulic systems will the installation of an oil cooler be necessary?

Constant tension mooring winch system

Hatch cover system

Watertight door system

Internal combustion engine hydraulic starter system

777

In which of the listed refrigeration system components does superheating of the refrigerant take place?

Expansion valve

Evaporator

Drier

Receiver

778

Increased internal leakage, in addition to poor hydraulic system response, and inadequate lubrication, is the result of .

pump bearings in poor condition

excessively worn actuator-piston packing

broken directional control valve centering springs

low hydraulic oil viscosity

779

Increasing the moisture content of conditioned air is known as what?

moisturizing

dehumidification

dampening

humidification

780

Increasing the 'reset rate' of a proportional-plus-reset controller .

narrows the proportional band

widens the proportional band

repeats the proportional action more frequently

increase the stability of the controller

781

Industrial process and commercial CFC type refrigeration equipment with annual leak rates of 35% or more, require leak repair of the system if it contains a refrigerant charge of more than what quantity?

15 pounds (6.8 kg)

25 pounds (11.4 kg)

40 pounds (18.1 kg)

50 pounds (22.6 kg)

782

Information from a data-logger can be helpful in determining the long term probability of machinery failure if you .

evaluate only the latest logged data as this is the best indication of plant status

evaluate a series of readings to obtain operating trends

monitor off limit conditions only when announced by an audible and visual signal

secure the machine under relatively steady state conditions

783

Inhalation of high concentrations of chlorofluorocarbon refrigerants (CFCs) may have which of the following effects?

drowsiness

loss of concentration

cardiac arrhythmia's

all of the above

784

Intake valves installed on most reciprocating low pressure air compressors are actuated by the pressure differential between the air in the cylinder and the pressure .

of the air on the external side of the valve

of the push rod and rocker arm assembly

sensed by the receiver low pressure limit switch

sensed by the intercooler diaphragm valve

785

Intercooling of a multistage air compressor provides the advantages of reducing the work of compression on the succeeding stages, and .

condensing part of the original water vapor content

reducing the maximum piston loads

increasing the volumetric efficiency

all of the above

786

It is necessary to replace the defective thermal expansion valve in a refrigeration system. If the valve is improperly sized, what could be the result? I. starvation of the evaporator coil if the valve is undersized II. constant hunting of the TXV and pressure surging if the valve is oversized

I only

II only

Either I or II

Neither I nor II

787

It is necessary to test the hydraulic system of a controllable pitch propeller. According to 46 CFR what should be done?

The vessel must be drydocked and the propeller removed when performing this test.

The system pressure should be prevented from exceeding the maximum allowable operating pressure set forth by the manufacturer.

The system should be tested at a pressure of 1 1/2 times the maximum allowable pressure.

All necessary repairs must approved by the Chief Engineer of the vessel.

788

Item "B" shown in the illustrated hydraulic circuit is used to .

act as a power source to operate the pumps indicated as "F"

act as a power source to operate the pump indicated as "E"

shut down the remotely operated electric motor driven pump when the watertight door has closed

shut down the operation of pump "E" when the watertight door has closed

789

Item "E" shown in the illustration is used in the hydraulic circuit as .

one of two motor driven remotely operated pumps to open and close the water tight door

the manually operated pump located in a common passage way to close the water tight door in an emergency

motor driven pump used to close the water tight door from the navigation bridge in an emergency

the manually operated pump used to open or close the water tight door from the engine room side

790

Items "B" and "D" are shown installed on the service gauge manifold set shown in figure "C", but are not present on the service gauge manifold set in figure "A" even though it is equipped to receive them. What are the devices "B" and "D"?

analog to digital converters

piercing valves

quick-coupler hose adapters

reducers

791

Joiner bulkheads on a MODU provide .

compartmentation

watertight integrity

structural support

tank boundaries

792

Large quantities of halogenated chlorofluorocarbons when released from refrigeration systems, will contribute to ozone depletion in which region of the atmopshere?

bathosphere

ionosphere

stratosphere

troposphere

793

Leakage of hydraulic fluid from around the shaft of a hydraulic motor may be caused by .

permanent loss of pump suction

worn shaft seals

high level in the oil sump

low motor RPM

794

Leaking suction valves in a refrigeration compressor are indicated by which of the following?

higher than normal suction pressure

lower than normal suction pressure

lower than normal evaporator temperature

noticeable increase in compressor noise

795

Leaking valves in a low pressure, reciprocating, air compressor can result from .

excessive compressor discharge pressure

operating the compressor at excessive speed

uneven piston stroke in the compressor

abrasion by dust and dirt

796

Leaking valves in an air compressor can be a result of .

excessive discharge pressure

abrasion, dust, and dirt

excessive compressor speed

irregular compression strokes

797

Lifeboat winches on a MODU are required to be inspected and an entry made in the logbook. What should this entry include?

The time required to lower a lifeboat.

The time required to raise a lifeboat.

The date of inspection and condition of the winch.

All of the above.

798

Lighter longitudinal stiffening frames on the MODU side plating are called .

stringers

side frames

side stiffeners

intercostals

799

Lint from cleaning rags can be harmful to hydraulic systems because the lint .

can cause rusting of internal parts

breaks down hydraulic fluid

can clog filters and promote component leakage

solidifies and causes cracked lines

800

Loss of refrigerant during the process of purging of air and non-condensible gases can be kept to a minimum by what action?

purging through a dehydrator

purging through the discharge service valve rather than the top of the condenser

cracking the purge valve briefly and allowing the refrigrant to re-settle between purges

purging through the top of the receiver rather than the top of the condenser

801

Low compressor head pressure in a refrigeration system can be caused by which of the following?

insufficient condenser cooling water flow

excessive condenser cooling water flow

air in the refrigeration system

excessive refrigerant in the system

802

Low side passive charging of a refrigeration system may be speeded up by what process?

warming the service cylinder with a torch

warming the service cylinder with warm water

inverting the service cylinder

inclining the service cylinder

803

Lubricating oil is added to the device shown in the illustration by using the component labeled ' .'

D

F

M

R

804

Main engine room control console alarms are usually designed to be of the self monitoring type, meaning that an open circuit to a particular alarm circuit will .

cause an alarm condition

secure power to the indicator

cause a backup power supply to energize

automatically reclose within 10 seconds

805

Major repairs or alterations affecting the safety of small passenger vessels of less than 100 gross tons shall .

not be made without the knowledge and approval of the OCMI

be permissible without the knowledge and approval of the Officer in Charge of Marine Inspection

be made at anytime convenient to the vessel operator without prior approval

be made only when Coast Guard Administrative Form 2892 is submitted

806

Minor repairs may be performed on low pressure refrigerant systems without recovering the refrigerant charge if the pressure in the system is raised to atmospheric. How may this be accomplished?

heat the refrigerant

pressurize the system with nitrogen

charge the system until it is completely filled with liquid refrigerant

open the system vent to the atmosphere and allow the pressure to equalize

807

Modern trends show that full flow filters used in multi- operation hydraulic systems would most likely be located .

on the reservoir return line

on the relief valve discharge line

between the control valves and the actuators

on the reservoir fill line

808

Moisture and impurities can be removed from pneumatic systems by using .

air intake heaters

desiccated suction strainers

multi-orificed suction valves

blowdown valves and filters

809

Moisture entering a typical refrigeration system will most likely produce what effect?

boil in the condenser

be removed by the liquid line strainers

cause sweating and frost on the evaporator coils

freeze in the expansion valve

810

Moisture in a refrigeration system can cause which of the following conditons?

freezing the expansion valve closed

corrosion of system piping

hermetic motor burnout

all of the above

811

Moisture in the refrigerant may produce what effect?

freeze within the expansion valve

emulsify the oil in the condenser

freeze in the king valve

clog the oil separator

812

Moisture is removed from a refrigeration system by what action?

draining refrigerant from the bottom of the condenser

opening a drain petcock on the oil separator

condensing the water in the heat exchanger

cutting in the dehydrator

813

Moisture is removed from recovered refrigerant using a recycling machine by what means?

purging noncondensables off the top of the recovery cylinder

opening a drain petcock on the oil separator

condensing the moisture in the condenser

circulating the refrigerant through a dehydrator

814

Monochlorodifluoromethane (R-22) when vaporized in the presence of an open flame, will form what chemical substance?

carbon dioxide gas

phosgene gas

trichlorodifluoromethane

sulphur dioxide

815

Most Freon refrigerants are originated primarily from which of the following base molecules?

ammonia and carbon dioxide

ammonia and ethane

methane and sulfur dioxide

ethane and methane

816

Most hydraulic steering gears are fitted with relief valves which .

function when the rudder is amidships

relieve excess whip pressure from the hydraulic oil system

protect the piping assembly from external rudder shock

relieve excessive telemotor pressure

817

Most of the liquid refrigerant to be removed from a pumped down system during a refrigerant recovery procedure would be found in what location?

condenser

receiver

hoses and lines

evaporator

818

Most solenoid valves are actuated by .

a spring

an electromagnet

the force of gravity

refrigerant pressure

819

New piping and tubing to be installed in a hydraulic system can be safely degreased by using .

alcohol

a water-based detergent

carbon tetrachloride

a special petroleum solvent

820

Obstructed suction passages in the casing or pintle of a radial piston hydraulic pump will cause the .

pump back pressure to decrease

pump return and discharge pressures to equalize

pumped fluid volume to decrease

pump discharge flow to drop to zero

821

Offset' is an inherent characteristic of which of the following types of control modes?

Two position

Proportional

Reset

Rate

822

Oil is returned to the illustrated radial piston hydraulic pump piston(s) numbered as .

1

2

3

2 and 3

823

Oil is supplied to the illustrated steering gear .

through flexible hydraulic hoses via the connection ports located in the top surface of "O"

via the connections indicated as "J"

through high pressure piping at "A" and then internal ports provided in the housing assembly "U"

via hydraulic hoses connected to the orifices in "B"

824

Oil separators installed in large refrigeration systems serve what function?

remove excess oil from the system

remove oil entrained in high pressure liquid lines

return oil entrained in the discharge gas back to the compressor crankcase

return oil entrained in the suction gas back to the evaporator inlet

825

Oil sprays on to a hot piece of machinery, catches fire and causes $35,000 damage to your vessel. By law this must be reported to the .

nearest Coast Guard unit

Officer in Charge, Marine Inspection at the first port of arrival

principal surveyor of the American Bureau of Shipping at the next U.S. port

U.S. Salvage Association Survey at the next U.S. port

826

On a modern refrigerated container unit employing suction modulation for the purposes of capacity control and capacity limitation, what happens when the applied voltage and current draw associated with the normally open (NO) suction modulation valve located in the suction line both increase?

the valve will further open, lowering evaporator presssure and raising suction pressure

the valve will further open, raising evaporator presssure and lowering suction pressure

the valve will further close, raising evaporator presssure and lowering suction pressure

the valve will further close, lowering evaporator presssure and raising suction pressure

827

On a MODU, the deck stringer is the outboard most deck .

plating

beam

stiffener

stanchion

828

On a MODU, the keel is the primary strength member of the lower hull form and is laid in which direction?

Transverse

Diagonal

Longitudinal

Vertical

829

On all mobile offshore drilling units, the deckhead of each accommodation space must be located above .

the operating draft

the survival draft

the transit draft

the deepest load line

830

On an electro-hydraulic steering gear, which of the listed devices will keep the rudder from over traveling the bridge signal?

Rudder angle indicator

Follow-up gear

Electric transmitter

Rudder angle limit switch

831

On small passenger vessels of less than 100 gross tons, watertight doors and watertight hatches are .

not required to be marked

required to be marked, but on only one side

require to be marked on both sides in clearly legible letters at least 25 millimeters ( 1 inch) high

none of the above

832

On small passenger vessels, separation of machinery and fuel tank spaces shall be .

provided between each of these spaces by watertight and/or vaportight bulkheads

separated from accommodation spaces by watertight and/or vaportight bulkheads

not considered as essential

separated from accommodations spaces by non-continuous bulkheads

833

On small, low pressure, air compressors, the cylinders are usually lubricated by the .

splash method

mechanical force feed lubricators

detached sump method

internal cooling passages in the crankshafts and connecting rods

834

On tank vessels using an automatic tape well for gaging tanks, the hand clutch is used to .

adjust the tape weight

lower the thieving rod

roll up the tape

calibrate the tank

835

On tank vessels using an automatic tape wells, free movement of the tape is normally checked by .

removing the side plate

operating the hand clutch

comparing with a hand tape

using litmus paste

836

One cause of high head pressure occurring in a refrigeration system can be which of the following?

insufficient cooling water flow to the condenser

a low refrigerant charge in the system

the expansion valve 'stuck' in too open a position

excessive evaporator superheat

837

One cause of leaky valves in a low pressure air compressor may be attributed to .

running with an air filter element different from that required by the original manufacturer's specifications

excessive operating hours without carrying out preventive maintenance

the compressor running too fast

excessive discharge pressure

838

One disadvantage of proportional-position action is that .

corrective action is only proportional to offset

exact correction can be made only when there is no change in load

the controlled variable is stabilized

the corrective action is only proportional to the deviation

839

One function of a replenishing pump installed in many pressure-closed hydraulic systems, is to supply fluid flow to .

the reservoir

a servo control circuit

position a manually controlled valve

the main system accumulators under all operating conditions

840

One function of the air receiver in a compressed air system is to .

dry the air discharged from the intercooler

minimize the system's line pulsations

receive exhaust air from pneumatic accessories

remove all traces of oil from the air

841

One function of the model checklists provided for the conduct of a practical demonstration is to promote .

repeatability in observing the assessment of the task to be demonstrated

a consistent standard in the assessment of the task to be demonstrated

a methodology by which elements of the missed practical demonstration can pointed out to the trainee

all of the above

842

One function provided by a hydraulic accumulator is to .

provide an area where air can separate from the oil

provide an area to separate solid contaminants from the oil

act as an oil and water separator

absorb sudden changes in hydraulic fluid flow occurring in the system

843

One function provided by a hydraulic accumulator is to .

provide an area where air can separate from the oil

provide an area to separate solid contaminants from the oil

act as an oil and water separator

absorb shocks occurring in the system

844

One important objective of a practical skill demonstration for mariner certification is to .

institute busy work for both the trainee and assessor

establish if the trainee can perform certain tasks at a later time

subjectively prevent trainee's from being licensed or certified

determine the degree of competence of the trainee during the assessment

845

One of the determining factors regulating the time interval for drawing a vessel's tailshaft depends upon the design to reduce stress concentrations. Which of the following factors, in part, would be considered to meet this design criteria?

Sprocketed keyway and slotted key.

Stress relief grooves at the forward end of the propeller and aft end of the liner.

Keyway is to be cut so as to give a sharp rise from the bottom of the keyway to the shaft surface.

All of the above.

846

One of the functions of the component labeled "E" shown in the illustration is to .

act as a hydraulic accumulator

separate oil from the compressed air supply

act as a oily water separator

provide for expansion of refrigeration gases

847

One of the functions of the component labeled "E", shown in the illustration, is to .

act solely as a heat exchanger

act as a lube oil sump

provide storage for compressed cryogenic gases

act as a cyclonic pneumatic dehydrator

848

One of the functions of the component labeled "E", shown in the illustration, is to .

act solely as a heat exchanger

act as a lube oil sump

provide storage for compressed cryogenic gases

act as a cyclonic oil separator

849

One of the primary steps in assisting someone who has been overcome by ammonia vapors is to do what?

loosen all clothing

provide the victim with smelling salts

rinse the affected area with water

give the patient plenty of fresh air

850

One refrigeration ton is equal to which of the following heat removal rates?

180 BTU/hr

2,000 BTU/hr

12,000 BTU/hr

2,880,000 BTU/day

851

Operating a reciprocating air compressor without an air filter will cause .

carbon deposits on valves and pistons

excessive wear on valves and cylinder liners

a clogged air intake

excessive compressor discharge pressure

852

Operating a reciprocating air compressor without an air intake filter can result in a/an .

immediate piston damage

immediate clogging of the intake

possible explosion in the compressor

deposit of carbon on the valves

853

Operating pressure on a P-tank system should be .

the same pressure required for repressurization and cleaning the system

a constantly maintained range of 15 to 18 psi

slightly below the pilot unloading valve setting

slightly below the safety valve setting

854

Operating pressure range for an oilfield supply boat 'P-tank' generally varies from .

5-15 psi

15-40 psi

50-100 psi

100-150 psi

855

Operating the compressor and motor as shown in figure 4 of the illustration, will result in .

premature damage to the bearings of the driving motor

premature damage to the bearings of the compressor

an increase in the axial thrust on the compressor crankshaft

a decrease in the axial thrust on the compressor crankshaft

856

Operating the compressor and motor as shown in figure 5 of the illustration, will result in .

severely damaging the V- grooves of the pulley

a decrease in the axial load on the crankshaft

a decrease in the axial load on the motor shaft

a decrease in the normal life of the drive belts

857

Operation of a hydraulic pump in a cavitating condition can cause .

the hydraulic fluid to become overheated

the fluid motor to become overloaded

the relief valve to hum

a decrease in pump RPM

858

Over pressurization of an air compressor intercooler is prevented by the .

aftercooler relief valve

intercooler relief valve

last-stage unloader

first-stage unloader

859

Over tightening of the valve stem packing to a pneumatically controlled final control element, shown in the illustration, will cause .

valve stem breakage

erratic operation

reduced controlled offset

overheating of the diaphram

860

Overcharging an air-cooled refrigeration unit will result in which of the following?

the relief valve will lift

the compressor will tend to run continuously

the system will automatically change over to the hot gas defrost cycle

the compressor will short-cycle on the high pressure cut-out

861

Overfilling a refrigerant container is extremely dangerous because of the high pressures generated. The generation of pressure is the result of what?

vapor pressure of the refrigerant at saturation temperature

discharge pressure of the recovery compressor

hydrostatic pressure of the expanding liquid

discharge pressure from the recovery cylinder

862

Overheating of a hydraulic system may be a result of .

changing pump discharge pressure in response to normal load variations

a high oil level

incorrect fluid viscosity

continued slow recirculation of the oil

863

Overheating of the hydraulic fluid in an electro-hydraulic anchor windlass can result from a/an .

overload on the pump motor

low fluid level in the reservoir

low fluid viscosity around the shaft seal

high oil level in the sump

864

Overheating of the hydraulic fluid in an electro-hydraulic anchor windlass, may indicate pump cavitation caused by .

overload of the pump motor

low oil level in the reservoir

low fluid viscosity existing only around the shaft seal

high oil level in the sump

865

Overheating of the oil in a hydraulic system can be caused by .

continuous leakage through the pressure relief valve

an increase in the number of the hydraulic fluid film layers

insufficient external pump slippage

fluctuating pump discharge pressure in response to normal load variations

866

Penetrations and openings in watertight bulkheads in a vessel of less than 100 gross tons must .

only be placed in transverse watertight bulkheads that extend to the bulwark deck

be provided with non- packed slip joints for expansion to permit passage of piping or electric cable

incorporate approved sluice valves

be kept as high and as far inboard as practicable

867

People familiar with ammonia refrigeration systems become accustomed to its odor and may forget that the vapors have which of the following properties?

in a low concentration can cause death

will dissolve in perspiration and cause caustic burns

will burn or explode

all of the above

868

Personnel servicing refrigeration systems and subject to the exposure to commonly used refrigerants should wear what type of personal protective equipment?

goggles and gloves

a respirator

rubber soled shoes

an all purpose gas mask

869

Persons recovering refrigerant from small appliances must be certified as what type of technician under the EPA Clean Air Act rules?

Type II technician

Type III technician

Type I or Universal technician

All of the above

870

Pertaining to the illustrated refrigerated container unit piping diagram, if the current box temperature is above, but fairly close to set point and the ambient temperature is relatively high, what would be the status of the economizer and unloading solenoid valves?

economizer solenoid valve: open unloading solenoid valve: closed

economizer solenoid valve: open unloading solenoid valve: open

economizer solenoid valve: closed unloading solenoid valve: open

economizer solenoid valve: closed unloading solenoid valve: closed

871

Pertaining to the illustrated refrigerated container unit piping diagram, if the current box temperature is above, but fairly close to set point and the ambient temperature is relatively low, what would be the status of the economizer and unloading solenoid valves?

economizer solenoid valve: open unloading solenoid valve: closed

economizer solenoid valve: open unloading solenoid valve: open

economizer solenoid valve: closed unloading solenoid valve: open

economizer solenoid valve: closed unloading solenoid valve: closed

872

Pertaining to the illustrated refrigerated container unit piping diagram, if the current box temperature is considerably above set point, to achieve a quicker pulldown in box temperature, what would be the status of the economizer and unloading solenoid valves?

economizer solenoid valve: open unloading solenoid valve: closed

economizer solenoid valve: open unloading solenoid valve: open

economizer solenoid valve: closed unloading solenoid valve: open

economizer solenoid valve: closed unloading solenoid valve: closed

873

Pigtails, or siphons, are used to protect Bourdon tube-type gages from the direct exposure to steam by .

changing the direction of the steam flow

rapidly reducing the steam velocity

creating a condensate seal

bleeding off a portion of the steam

874

Pillar cross-sections of "I", "H", or circular are used in ship construction in locations where there are large expanses, void of intermediate decks and bulkheads, such as in cargo holds and engine rooms. A supporting pillar which becomes bent out of vertical will .

not be critical until the vertical angle approaches 15

loose practically all of its strength as a support

most likely experience shear stress failure if not reinforced immediately

not pose any problem, provided there are no cracked welds connecting it to any adjoining strength members

875

Plug valves installed in hydraulic systems are most suitable for use as .

main supply line throttle valves

variable flow control valves

two position flow control valves

check and choke valves

876

Pressure in an operating hydraulic system is developed .

only by the pump as its primary function

by resistance to the fluid flow through the system

by the thermal input to the system's fluid

solely by the charge applied by the accumulators

877

Prior to making non-major repairs (such as replacing a main liquid line dehydrator dessicant cartridge) of a large, multi- box refrigeration system, what should be done before opening the system?

recover the entire refrigerant charge to a suitable recovery cylinder, then isolate the dehydrator

pump down the low side and liquid line to the deepest achievable vacuum by closing the king valve, then isolate the dehydrator

pump down the low side and liquid line to 0 psig by closing the king valve, then isolate the dehydrator

isolate the dehydrator then release the remaining refrigerant in the dehydrator to the atmosphere

878

Prior to making repairs on a refrigeration system containing a refrigerant covered under the EPA Clean Air Act rules, if system leaks prevent reaching the required levels of evacuation for recovery of refrigerant, what will need be to be done?

only recover the refrigerant vapor from the system

only recover the liquid refrigerant from the system

repressurize the system with refrigerant to locate the leak

isolate non leaking components and evacuate to mandated levels wherever possible

879

Prior to testing the pyrometer circuit wiring for continuity with a multimeter, you should disconnect the pyrometer because .

the driving voltage of the meter batteries can damage the circuit meter

the pyrometer total resistance can damage the ohmmeter

the reactance of the pyrometer will give a false meter reading

meter current running through the pyrometer will permanently magnetize the pyrometer's pointer

880

Prior to the burning or welding of a fuel tank on a MODU, regulations require that an inspection be made. An entry in the unofficial logbook is required if this inspection is made by .

a marine chemist

the Officer in Charge, Marine Inspection

the Master or person in charge of the MODU

the National Fire Protection Association

881

Propeller pitch speed minus ship speed divided by the propeller pitch speed is termed .

apparent slip

true slip

pitch

propulsive efficiency

882

Proper internal lubrication of a hydraulic anchor windlass left idle for extended periods can be accomplished by .

performing a check run on the unit at regular intervals

testing the hydraulic fluid for proper pH

checking the reservoir for proper level

cleaning strainers at regular intervals

883

Properties of a good refrigeration compresor lubricating oil include which of the following?

low wax content

high pour point

high viscosity

all of the above

884

P-tank dry bulk material discharge hoses must be connected .

after admitting compressed air to the P- tank

before admitting compressed air to the P-tank

after opening the jet air

before the P-tank is loaded

885

P-tanks are filled through the .

discharge line

pressurized fill line

fill line by gravity

the hatch or manway in the top of the tank by gravity

886

P-tanks on board a supply boat are filled through the .

jet air or purge line

discharge line

fill line by gravity

pressurized fill line

887

Pure anhydrous ammonia is considered noncorrosive to what metal or metals?

iron and steel only

steel only

iron, steel, and copper- bearing metals

copper-bearing metals only

888

Purging air from a hydraulic system is necessary when .

adding small amounts of oil to the system

the system has been overheated

the system has been drained and then filled with new oil

the system has been idle for a long period of time

889

Purging is the process used to do what?

eliminate moisture from the refrigeration system

separate refrigerant from oil

remove noncondensable gases from the refrigeration system

decrease the total amount of refrigerant in the system

890

R-134a is often the replacement for which older type of refrigerant?

R-12

R-22

R-11

R-123

891

R-22 has been a suitable refrigerant for use in high temperature (air conditioning) applications with which of the following compressor types?

reciprocating compressors

rotary compressors

centrifugal compressors

all of the above

892

R-22 is generally considered to be a safe, nontoxic, nonflammable, and nonexplosive refrigerant. It can, however, become highly toxic under what conditions?

superheated outside the system

in contact with an open flame

heated to the boiling point

all of the above

893

Rather than design an infinite variety of thermostatic expansion valve sizes to accommodate different capacities for heat removal, some manufacturers use a few standard valve body sizes in conjunction with what other feature?

an externally adjustable superheat to accommodate different heat removal capacities

a flexible diaphragm to accommodate different heat removal capacities

internal needle valve orifices of various sizes to accommodate different heat removal capacities

internal equalizers to accommodate different heat removal capacities

894

Reciprocating air compressor bearing failure may result from .

a misaligned crankshaft

overtightened drive belts

contaminated sump oil

all of the above

895

Referring to the device shown in the illustration, if a reversed output were desired from a comparable unit as the system pressure increased, the necessary physical changes to the unit would be .

the offsetting of the power head, or motor, and the use of a reversing lever

the sensing or feedback connection made from below the power head or motor

the offsetting of the power head or motor, and the use of a reversing diaphragm

the exchange of the pilot valve with one that would be downward seating

896

Referring to the device shown in the illustration, the coiled sensing lines "A" and "B", are used simultaneously when the pilot is used .

to maintain a level in a tank vented to the atmosphere, pressurized, or operating under a vacuum

to maintain a tank level where there exists a variable vapor pressure atmosphere

as a square root extractor when variable ratios are present in the processing system

to maintain a constant flow differential across a turbine- driven, centrifugal pump

897

Referring to the device shown in the illustration, the port labeled "F" would be connected to .

a constant control air supply pressure

variable output pressure line to a regulating valve diaphram

a feedback signal pressure

a atmospheric vent line

898

Refillable tanks used to ship CFC and HCFC refrigerants or used to recover these refrigerants must meet the standards of what entity?

the United States Coast Guard

the United States Department of Transportation

the Underwriters Laboratories

the Enviromental Protection Agency

899

Refrigerant entering the compressor of a refrigeration system should be in which of the following conditions?

High pressure liquid

High pressure vapor

Low pressure vapor

Low pressure liquid

900

Refrigerant enters the condenser in what condition?

high pressure liquid

low pressure vapor

high pressure vapor

low pressure liquid

901

Refrigerant flow through a thermostatic expansion valve is greatest under what conditions?

when the evaporator has just begun feeding at relatively high box temperature

just before the evaporator stops feeding at relatively low box temperature

when the low side and high side pressures are equal

when the low side pressure and the bulb pressure are equal

902

Refrigerant is circulated through a refrigeration system by the action of what component?

compressor

condenser

expansion valve

evaporator

903

Refrigerant is normally subcooled in a refrigeration or air conditioning system condenser for what purpose?

maintain adequate coil back pressure

prevent flashing in the liquid line

reduce refrigerant volume in the system

reduce compressor discharge line loading

904

Refrigerant leaving the metering device in a refrigeration system is in which of the following conditions?

sub-cooled liquid only

superheated vapor only

saturated liquid/vapor mixture

superheated liquid/vapor mixture

905

Refrigerants that experience fractionation when changing state are characterized as what?

azeotropic mixture of refrigerants

single component organic refrigerants

zeotropic blend of refrigerants

single component inorganic refrigerants

906

Refrigeration system isolation valves are specially designed with a back-seat, as well as a front-seat. For what purpose are these valves designed in this way?

allow for operation as a suction or discharge valve

permit repacking the valve stem under pressure without shutting down