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

 

 

Click Here to Begin Preparing for Your License in the Online Study.

This page is just a preview of the 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.

All of the latest questions and illustrations on "Steam Plants I " are in the Online Study.


1

When the boiling temperature of a steam boiler is increased, which of the following effects will occur with relation to the pressure and the specific volume of the steam?

The steam pressure and specific volume will remain constant.

The steam pressure will increase and the specific volume will remain constant.

The steam pressure will remain constant and the specific volume will increase.

The steam pressure will increase and the specific volume will decrease.

2

46 CFR requires that .

the OCMI be notified of repairs to boilers and unfired pressure vessels

the fuel burned in boilers of tank ships shall have a flash point of not less than 140F

a half-pint sample of each load of fuel be drawn and sealed at the time of supply and preserved until that fuel is exhausted

all of the above

3

A badly warped boiler water tube can be reworked and bent back into shape by . I. heating it with a torch and reforming it with a soft mallet II. cold pressing it back into shape with a hydraulic jack

I only

II only

Both I and II

Neither I nor II

4

A basic comparison can be made between a low pressure evaporator operation and a main condenser with regards to the removal of non-condensable gases. The vacuum drag line for the main condenser is specifically connected in which area?

main tube bank

steam lane

air cooler section

hot well

5

A boiler accumulation test is used to measure the .

lifting pressure of the boiler safety valves

total relieving capacity of the boiler safety valves

steam generating capacity of the boiler

blow down pressure of the boiler

6

A boiler desuperheater is installed in high pressure boilers to . I. maintain flow through the superheater II. raise the steam temperature in the steam drum

I only

II only

Both I and II

Neither I nor II

7

A boiler economizer should be bypassed whenever the .

temperature of the stack gas is low enough to reach dew point

superheater outlet temperature is too high

DC heater outlet temperature is too high

main turbine is operating at half power

8

A boiler feed stop-check valve would be located at the .

boiler water drum

first stage feed water heater outlet

DC heater outlet

economizer inlet

9

A boiler feed stop-valve must be mounted .

between the feed check valve and the boiler drum

between the feed pump and the feed check valve

upstream of the feed water regulator

at or near the engine room operating platform

10

A boiler fitting used to protect the superheater and to provide reduced temperature steam for use by auxiliaries is the .

reducing station

feed water injector

desuperheater

dry pipe

11

A boiler has a steam delivery capacity of 100,000 pounds per hour, and is equipped with four steam atomizing burners. If the load range of the burners is 4 to 1, this means that .

the boiler may be operated down to 25,000 pounds per hour without securing any burners

the boiler may be operated down to 25,000 pounds per hour only after three burners are secured

if two burners are operating, steam output will be a minimum of 50,000 pounds per hour

all four burners combined can supply up to 400,000 pounds of steam per hour

12

A boiler internal feed pipe is perforated to .

provide positive downward circulation at high loads

distribute the feed water throughout the steam drum

reduce back pressure in the feed water piping

reduce the overall weight of the drum internals

13

A boiler internal feed pipe is perforated to .

provide positive flow to the downcomers

create a slight turbulence in the steam drum

distribute water evenly throughout the steam drum

reduce the weight of the steam drum internals

14

A boiler is to be secured in port. After the burners have been secured, the forced draft fan and air registers should be secured .

immediately after carrying out the former procedures

after any oil on the furnace floor has been burned off and cleared of combustion gases

after 30 minutes has elapsed, after carrying out these procedures

after at least 1 hour has elapsed, after carrying out these securing procedures

15

A boiler safety valve must be capable of .

remaining open until all pressure in the steam drum is relieved

remaining open until a preset pressure drop occurs

opening gradually above a designated pressure

closing with a chattering motion to free scale deposits from the seats

16

A boiler superheater safety valve is set to lift at 450 psi (3102 kPa). Coast Guard Regulations (46 CFR) require that if there is a pressure drop of 10 psi (69 kPa) across the superheater, the drum safety valve should set to lift at a pressure of .

450 psi (3102 kPa)

455 psi (3137 kPa)

460 psi (3171 kPa)

465 psi (3206 kPa)

17

A boiler superheater support tube differs from a standard generating tube in that the .

direction of flow of the steam and water mixtures differ

metals from which they are fabricated differ

outside diameters and wall thicknesses differ

method of heat transfer in the tube differs

18

A boiler water sample being collected for analysis should be circulated through a cooling coil because .

this keeps the water from flashing into steam as it is drawn from the higher pressure of the boiler into atmospheric conditions

it reduces the amount of suspended matter that frequently finds its way into the dead end lines

the cool sample has a higher conductivity measurement and the total dissolved solids in the water are easier to identify

the degree of acidity as measured on the pH recorder is amplified by cool water temperatures

19

A boiler with a water capacity of 10 tons, generates steam at the rate of 30 tons per hour. If the feed water concentration of solids was initially 0.5 PPM, and will increase at a rate of 1.5 ppm every hour, what would be the increase in the feed water concentration of solids after 24 hours?

12 ppm

24 ppm

36 ppm

48 ppm

20

A boiler with a water capacity of 10 tons, generates steam at the rate of 30 tons per hour. If the feed water quality is 0.5 ppm, the concentration of solids will increase 1.5 ppm every hour. What would be the increase in the concentration of solids within 24 hours?

12 ppm

24 ppm

36 ppm

48 ppm

21

A burner atomizer improperly positioned in the distance piece, may cause .

oil impingement on furnace walls

slag formation on the screen tubes

erosion of the screen tube baffles

the ends of the flame, farthest from the atomizers, to be a yellowish orange, or golden shade

22

A cause of high superheater outlet temperature is ,

high feed water temperature

low feed water temperature

excessive fuel oil temperature at the settlers

insufficient excess air

23

A check valve is located between the economizer and the steam drum to .

assure a positive feed water flow through the economizer

assure a positive feed water flow to the steam drum

prevent the feed pump from becoming vapor bound

prevent steam and water flow reversal from the drum should an economizer casualty occur

24

A chemical based analysis of boiler stack gases is taken to .

determine the volume of the SO2 products of combustion

estimate the amount of noncombustible solids present in fuel oil

estimate the BTU content of a quantity of fuel oil

measure the percentage volume of CO2

25

A combustion control system diaphragm type air flow transmitter receives its high pressure signal from the boiler .

fan discharge

windbox

furnace

smoke box

26

A combustion control system, diaphragm-type, air volume regulator receives its low pressure signal from the boiler .

windbox

casing

furnace

smoke pipe

27

A common gas dissolved in water contributing to the greatest amount of corrosion in a condensate system is .

carbon dioxide

hydrogen

carbon monoxide

nitrogen

28

A condensate recirculating line is provided to the main condenser in a closed feed water system to .

prevent excessively cooled distillate from entering the DC heater

provide adequate cooling water to the air ejector inter and after condensers

assure a positive flow through the main feed pump

prevent flashing in the main feed pump

29

A contaminated steam generator is used to produce saturated vapor from collected .

bilge water

sanitary water

fuel oil heating return drains

condenser cooling water

30

A continuous blow is used to .

regulate the density or salinity of boiler water

remove scum from the surface of boiler water

permit air to escape while raising steam in a cold boiler

remove sludge from the bottom of the water drum

31

A convection type superheater in a D-type boiler is protected from radiant heat by .

generator tubes

convection currents

control desuperheaters

water screen tubes

32

A corbel in the furnace of a water-tube boiler is a .

preformed burner arch section

fillet of plastic refractory

formation of soot on furnace floor

type of refractory anchor bolt

33

A corbel in the furnace of a water-tube boiler is a fillet of plastic refractory used as a .

means of excluding slag from the joints at the furnace floor, walls, and corners

preformed burner arch section

foundation for refractory anchor bolts

set of gas baffles in the screen tubes

34

A corbel is used in a boiler furnace to .

protect the expansion joints

reduce gas turbulence

direct the flow of gases

contain the furnace heat

35

A decrease in condenser vacuum is found to be caused by a loss of the air ejector loop seal. To reestablish the loop seal, you should .

crack open the recirculating line from the DC heater to the condenser hot well

close in on the recirculating line from the DC heater to the condenser hot well

bypass the regulating valve in the condensate recirculating line until the loop refills

close the condenser loop seal valve until the loop refills and reopen slowly

36

A desirable property of boiler fuel oil is .

low carbon content per pound of fuel

high sulphur content for complete combustion

high BTU content per pound of fuel

low residual acid after combustion

37

A dissolved oxygen concentration of 8.0 ppm represents .

8 lbs of oxygen dissolved in 1,000,000 tons of water

8 tons of oxygen dissolved in 1,000,000 pounds of water

8 ounces of oxygen dissolved in 1,000,000 ounces of water

80 ounces of oxygen dissolved in 100,000 ounces of water

38

A flame scanner installed in modern boiler combustion control systems, functions to .

monitor the intensity of the burner flame

monitor the stack for soot fires

regulate burner fuel oil pressure

regulate the air flow to the furnace

39

A flue gas air heater, when installed in a boiler would be accompanied by the operating characteristic(s) of . I. higher uptake temperatures than a boiler without an air heater II. lower corrosion rates in the uptakes and economizer

I only

II only

Both I and II

Neither I nor II

40

A flue gas air heater, when installed in a boiler, would be accompanied by the operating characteristic(s) of . I. higher furnace temperatures than a boiler without an air heater II. greater heat absorption per pound of fuel

I only

II only

Both I and II

Neither I nor II

41

A flue gas analysis is performed to determine the .

percentage of nitrogen by volume

correct fuel/air ratio for efficient combustion

carbon content of the fuel being burned

specific heat of combustion products

42

A furnace wall in which there are open spaces around the brick as a result of firebrick shrinkage, is .

normal and need only be cleaned

loose and should be repaired

cracked and must be patched

spalled and must be replaced

43

A heavy accumulation of soot on the fireside of the superheater can cause a .

low superheater outlet temperature because of the insulating effect of soot

high superheater outlet temperature because of reduced steam flow

high superheater inlet temperature because of decreased heat transfer

high superheater outlet temperature because of gas laning

44

A high carbon monoxide content in the flue gases of a boiler indicates .

complete combustion

too much excess air

incomplete combustion

a high carbon content fuel

45

A high percentage of carbon dioxide in boiler flue gases indicates .

carbonized burner tips

too much excess air

contaminated fuel oil

nearly complete combustion of fuel oil

46

A high water level in a deaerating feed heater will cause the automatic dump valve to drain condensate to the .

atmospheric drain tank

reserve feed tank

auxiliary condenser

main condenser

47

A higher than normal stack gas temperature could indicate .

dirty firesides or watersides

inner or outer casing leakage

eroded water screen tube walls

defects in burner cone refractory

48

A hole should be made in the sagged tube occurring in a water-tube boiler, prior to plugging the tube to prevent a .

pressure buildup in the tube

quick burnout of the tube

complete sagging failure of the tube

crack failure of the tube

49

A leak in a desuperheater could be indicated by an .

increased boiler water compound level in the boiler with the affected desuperheater

increased concentration of dissolved oxygen in boiler water

inability to maintain control of boiler water suspended solids

inability to maintain proper boiler water pH or phosphate levels

50

A leak in a heating coil in a fuel oil storage tank should be detected quickly by .

an increase in fuel oil temperature

observing oil on the contaminated evaporator steam coils

the presence of fuel oil in the inspection tank

the sputtering of burners in the boilers

51

A leak in the heating coils of a fuel oil heater will first show up as .

water in the fuel oil supply

oil in the drain inspection tank

sputtering and hissing furnace fires

an intense white furnace flame

52

A leak in the internal desuperheater located in one of the two main boilers on a ship can be indicated by a/an .

decrease in the amount of feed treatment chemicals remaining in that boiler

increase in the amount of feed treatment chemicals contained in that boiler

decrease in the amount of feed treatment required for proper water chemistry of that boiler

increase in the amount of time necessary for priming that boiler

53

A leaking boiler desuperheater may be indicated by a/an . I. gradual, but continual rise in phosphate readings in only one boiler II. inability to maintain normal working pressure in the auxiliary steam system

I only

II only

Both I and II

Neither I nor II

54

A leaky fuel oil heater relief valve could be indicated by an increase in the .

sludge tank level

discharge piping temperature

contaminated drain tank level

fuel oil service pump pressure

55

A light brown haze issuing from the boiler smoke stack generally indicates .

dirty fuel atomizers

good fuel combustion

too much fuel pressure

a high firing rate

56

A lower than normal boiler stack gas temperature usually indicates .

dirty firesides

dirty watersides

fuel high sulfur content

incomplete combustion

57

A main condenser utilizing a scoop for the circulation of seawater must be constructed as a .

two-pass heat exchanger

single-pass heat exchanger

counterflow heat exchanger

parallel flow heat exchanger

58

A major difference between the two element and the three element feed water regulator control systems, is that a three element system will additionally measure and incorporate the .

drum water level to the feed water regulator

steam flow to the feed water regulator

feed water flow as sensed variable

fuel oil flow to the feed water regulator

59

A malfunction in the DC heater is indicated by .

the boiler requiring excessive amounts of oxygen scavenging chemicals

water and steam entering the DC heater at different temperatures

condensate coming in contact with steam inside the heater

air flowing from vent condenser vent

60

A mechanical carbon dioxide recorder operates by detecting the difference between air and the .

color of boiler flue gases

temperature of the flue gases

soot content of the flue gases

specific weight of the flue gases

61

A natural circulation water-tube boiler, with one or more water drums, would be classified as a/an .

accelerated natural circulation boiler

controlled circulation boiler

header-type boiler

drum-type boiler

62

A nozzle reaction safety valve will lift at a pressure lower than required if the .

adjusting ring is set too low

blow down is set too low

nozzle ring has come adrift

spring compression is insufficient

63

A photoelectric cell is installed in an oil fired boiler safeguard system to introduce proper resistance values to the electronic control circuit. This device is primarily sensitive to .

light emitted from the back wall incandescent brickwork

light emitted from the front wall incandescent brickwork

the orange portion of the flame spectrum

the blue portion of the flame spectrum

64

A pneumatic dual element, main propulsion, boiler feed water regulating system commonly used aboard ship utilizes .

two-position differential action

proportional action

proportional plus reset action

on off reset action

65

A practical consideration to allow for when operating a boiler at low load with regard to heat absorption is the requirement to .

maintain uptake gas temperature above the dew point

maintain an excess of CO

protect the safety valves from excessive temperature

prevent excess air density

66

A primary function of burner atomization steam is to .

maintain a constantly high fuel pressure

prevent overheating of the air register when secured

maintain a constantly high fuel temperature

impart a swirling motion in the oil spray for efficient combustion

67

A rapid fluctuation of the superheater outlet temperature on a steady steaming boiler could indicate .

water carryover into the superheater

excessive steam flow through the superheater

leaks in the superheater element

failure of the internal auxiliary desuperheater

68

A regenerative type air heater should be bypassed at low load in order to .

prevent chipping of the ceramic coating

prevent condensation in the steam baffling

avoid excessive cooling and condensation of the exhaust gases

maintain a positive seal on the replaceable basket

69

A ruptured boiler tube should be removed by . I. splitting the remaining tube sections with a safety ripping chisel II. cutting out most of the tube and then allowing the remaining portion to disintegrate as the boiler is normally fired

I only

II only

Both I and II

Neither I nor II

70

A salinity indicator cell is located in the .

seawater side of the main condenser

main condenser hot well

evaporator brine suction line

low pressure turbine casing drain

71

A sample of boiler water can be chemically tested for alkalinity by initially adding a few drops of phenolphthalein and then slowly titrating the water sample until the .

sample color changes from clear to pink

sample color changes from pink to clear

water sample pH reaches 10.5

entire concentration of chlorides have been neutralized

72

A secondary function of atomization steam in a fuel oil burner is to .

maintain a constantly high fuel pressure

prevent overheating of the atomizer when not firing during maneuvering

maintain a constantly high fuel temperature

vary the viscosity of the fuel oil

73

A secondary function of the refractory installed in a marine boiler is to .

support the boiler casing

direct the flow of combustion gases

maintain air flow through the burner diffuser

support the burner distance piece

74

A set of first and second stage air ejectors are used with a large sea water cooled steam condenser. If the first stage air ejector is not in operation . I. vacuum can not be established II. maximum operating vacuum can not be maintained

I only

II only

Both I and II

Neither I nor II

75

A single element boiler feed water regulating system used aboard ship utilizes .

two position differential gap action

proportional action

proportional plus reset action

proportional plus reset plus rate action

76

A slight vacuum is maintained in the shell of the first stage heater shown in the illustration. The primary reason for the vacuum is to .

provide a low pressure area to guarantee feed water flow to the heater

maintain a positive flow of steam as supplied by the main engine LP bleed system

force the use of the main condenser as the drain cooler

avoid the necessity of having to use the condensate pumps

77

A small leak in the desuperheater of an operating boiler could cause an .

immediate increase in superheater outlet pressure

immediate decrease in superheater outlet temperature

immediate drop in boiler water level

inability to maintain required boiler water chemistry

78

A sodium sulfite test is performed on a boiler water sample to determine if .

there is any excess sulfite present

the pH of the boiler water is within the prescribed limits

the dissolved oxygen in the boiler water is within tolerable limits

the hardness factor is maintained as close to zero as possible

79

A solenoid valve in the boiler fuel oil supply line will close when the .

main turbine throttle valve is closed

boiler is operating at low pressures

forced draft fan fails

fuel oil temperature exceeds 150F

80

A steam plant is operating at 100% power when the atmospheric drain tank runs dry allowing a large air leakage into the main condenser. Which of the following will occur as a result of this air leakage?

Decreased condensate temperature

Decreased pressure in the main condenser

Decreased suction pressure at the condensate pump

Decreased condenser cooling water outlet temperature

81

A steam supplied heat exchanger will fail to maintain the designed quantity of heated liquid output if the . I. steam side shell absolute pressure is decreased II. heat exchanger drain is leaking

I only

II only

Both I and II

Neither I nor II

82

A steam supplied heat exchanger will fail to maintain the designed quantity of heated liquid output if the . I. steam supply absolute pressure is increased II. tubes are leaking

I only

II only

Both I and II

Neither I nor II

83

A strong, well defined sound developed by the steam whistle, shown in the illustration, is obtained by adjusting the .

operating lever stroke

whistle valve travel

position of the back cover

number of diaphragms

84

A sudden increase in boiler water hardness or chloride content could indicate .

a leaking condenser tube

evaporator priming

bilge water leaking into the makeup feed tanks

all of the above

85

A sudden unexplainable drop has occurred in the outlet temperature of an uncontrolled interdeck superheater on a boiler carrying a higher than normal TDS (total dissolved solids) reading. Which of the actions listed is required?

Immediate increase in the firing rate.

Reduction in the forced draft fan speed.

Lowering the steam drum water level.

Raising the feed water temperature.

86

A sulfite test is conducted on boiler water to check for .

nitrates

sulfates

phosphates

excess oxygen scavenging agents

87

A suspected leak in an operating fuel oil heating coil is normally confirmed by .

checking the pH of heating coil returns

conducting a soap test

conducting a blotter spot test

checking the drain inspection tank

88

A test of boiler water for chloride content indicates the amount of .

suspended matter present

dissolved gases present

seawater contamination present

all of the above

89

A theoretical engine cycle is a process that .

takes place in the combustor of the engine

begins with certain conditions, progresses through a series of additional conditions and returns to the original conditions

begins with certain conditions, progresses to a steady state and stays there

None of the above.

90

A triple element, main propulsion, boiler feed water regulating system commonly used aboard ship utilizes .

two-position differential gap action

proportional action

proportional plus reset action

proportional plus reset plus rate action

91

A turbine-driven centrifugal feed pump used for boiler feed service should normally be stopped by .

hand activating the over speed trip

closing off the steam via the excess pressure pump governor

slowly closing the manual throttle

opening wide the recirculating valve and then manually closing the throttle

92

A two-element boiler feed water regulator is controlled by .

steam flow and feed water flow

steam flow and drum water level

drum water level and feed water flow

drum water level and drum pressure

93

A two-element feed water regulator not only responds to changes in water level, but is also designed to react to .

feed water flow

steam flow

fuel flow

steam pressure

94

A two-element feed water regulator reacts to changes in the steam drum water level and the .

steam flow from the boiler

main feed pump speed

water flow to the boiler

signal from the flame scanner

95

A two-element feed water regulator responds directly to changes in .

feed water flow to the boiler

feed water pump discharge pressure

DC heater water level

steam flow from the boiler

96

A unit of measure used to express the chloride content of boiler water is .

PPM

Micro-Farads

pH

Micro-Ohms

97

A vent line is provided on each water box of the main condenser in order to prevent .

insufficient head pressure being developed on the circulating pump discharge

inadequate heat transfer from developing during normal operation

Both A and B

Neither A nor B

98

A vent line is provided on each water box of the main condenser in order to prevent . I. insufficient head pressure being developed on the circulating pump discharge II. inadequate heat transfer from developing due to air bound tubes

I only

II only

Both I and II

Neither I nor II

99

A water-tube boiler can be laid up either wet or dry. If it is to be laid up wet, you should .

completely fill the boiler with water, then blow down to steaming level

completely fill the boiler with deaerated feed water and maintain a slight pressure

drain and refill the boiler each week

drain and refill the boiler when the pH goes above 6

100

A water-tube type boiler is more efficient than a fire-tube type boiler as .

a water-tube boiler requires less maintenance

the water-tube boiler produces more pounds of steam per pound of boiler

Both "A" and "B"

Neither "A" or "B"

101

A water-tube type boiler when compared to a fire-tube type boiler has an advantage of . I. a water-tube boiler requiring less chemical compounding II. the fire-tube boiler providing a greater amount of heat transfer to the water as the hot gases pass through the tubes

I only

II only

Both I and II

Neither I nor II

102

According to 46 CFR Part 61, which of the following statements is true concerning the inspection of water-tube boilers?

All mountings shall be opened up and examined by a Coast Guard inspector at eight year intervals after the initial inspection.

All boiler mounting studs or bolts shall be removed for examination by a Coast Guard inspector every 4 years after initial inspection.

Boiler mountings attached to boiler nozzles must be opened and removed for examination every 8 years.

Boiler mountings attached directly to the boiler plating by screwed studs and nuts shall be removed and examined every 10 years.

103

According to 46 CFR Parts 59 and 35, which of the following is true?

The OCMI must be notified of emergency repairs to boilers and unfired pressure vessels.

The fuel burned in boilers of tank ships shall have a flash point of not less than 120F.

A one gallon sample of each load of fuel oil shall be drawn and sealed at the time of supply and preserved until that fuel is exhausted.

All of the above.

104

According to 46 CFR, which of the following statements is true concerning main boiler safety valve escape piping?

Expansion joints or flexible pipe connections are prohibited.

The piping shall be led as near vertical as possible to the atmospheric drain tank.

The piping should be supported and installed so that no stress is transmitted to the valve body.

All of the above.

105

According to 46 CFR's, all oil-fired main propulsion boilers with automatic burner safety control systems must be provided with .

controlled desuperheaters

stack temperature pyrostats

one flame detector for each burner

one flame detector in each furnace

106

According to 46 CFR's, steam piping subject to main boiler pressure must be hydrostatically tested at specified intervals. Therefore, which of the following statements is true?

The piping must be tested at a pressure and temperature specified by a Coast Guard marine inspector.

The piping must be tested at 1 1/2 times working pressure every 4 years.

Piping under 3 inches nominal pipe size need not be hydrostatically tested.

The piping must be tested at 2 times maximum allowable pressure every 4 years.

107

According to Coast Guard Regulations (46 CFR) a 'oil fuel unit' is correctly described by which of the following statements?

The amount of heat released by burning a 'unit' amount of fuel oil.

Equipment used for the preparation of fuel oil for delivery to an oil fired boiler.

The amount of thermal units required to raise the temperature to the flash point in an open cup tester.

The amount of thermal units necessary to cause a liquefied flammable gas to exceed a certain Reid vapor pressure.

108

According to Coast Guard Regulations (46 CFR), a 1200 psig maximum allowable working pressure boiler, with external blow off piping is required to have the blow off piping withstand a minimum of .

1200 psig

1425 psig

1500 psig

1575 psig

109

According to Coast Guard Regulations (46 CFR), blow off piping external to a boiler with a maximum allowable working pressure of 600 psig must be capable of withstanding a minimum pressure of .

600 psig

750 psig

825 psig

900 psig

110

According to Coast Guard Regulations (46 CFR), feed water nozzles shall be fitted with sleeves, or have other suitable means employed to reduce the effects of temperature differentials on all boilers designed for operating pressures of .

250 psig (1825 kPa) or over

300 psig (2169 kPa) or over

400 psig (2859 kPa) or over

600 psig (4238 kPa) or over

111

According to Coast Guard Regulations (46 CFR), fusible plugs are not permitted on auxiliary boilers where the maximum steam temperature to which they are exposed exceeds .

206F

218F

425F

850F

112

According to Coast Guard Regulations (46 CFR), periodic hydrostatic tests are required to be conducted without exception on all .

main propulsion boilers

auxiliary steam piping

air receivers

all of the above

113

According to Coast Guard Regulations (46 CFR), the studs and bolts on marine boiler mountings must be removed for examination at least every .

3 years

4 years

5 years

10 years

114

According to Coast Guard Regulations (46 CFR), what action should be taken if the metal thickness of a marine boiler is found to be thinner than original specifications?

Affected areas should be built up by welding.

Boiler should be condemned.

Drum should be renewed before the next biennial inspection.

Working pressure should be recalculated.

115

According to Coast Guard Regulations (46 CFR), what is the maximum time interval for hydrostatically testing boilers on a cargo vessel having water-tube boilers?

1 year

2 years

5 years

8 years

116

According to Coast Guard Regulations (46 CFR), what is the minimum flash point of oil to be used as fuel for the boilers?

80F (26.7C)

110F (43.3C)

140F (60.0C)

150F (65.6C)

117

According to Coast Guard Regulations (46 CFR), what is the highest steam temperature to which fusible plugs may be exposed?

290F

375F

425F

500F

118

According to Coast Guard Regulations (46 CFR), which of the following is classified as a boiler mounting?

Main feed check valve

Soot blower element

Blow off valve

Escape piping drain valve

119

According to Coast Guard Regulations (46 CFR), which of the following is permitted in boiler fuel oil service system discharge piping?

Screwed bonnet valves of the union bonnet type.

Pipe unions one inch or greater in diameter.

Bushings made of seamless steel.

Street ells made of carbon steel.

120

According to Coast Guard Regulations (46 CFR), which of the following steam piping conditions, subjected to main boiler pressure, is exempted from hydrostatic testing?

All piping with a nominal size of 3 inches or less.

All piping from the main steam stop to the throttle valve.

All piping to the ship's service generators.

All piping equipped with a safety or relief valve.

121

According to Coast Guard Regulations, boiler safety valves .

shall not have valves on drain lines

will only be set and sealed by the Chief Engineer

will be provided with a suitable lifting device operated only from the fire room

all of the above

122

According to the data given in illustration SG-0026, which of the following would be the physical state of the fluid at a gage vacuum of 25.03 inches Hg, and 126.08 degrees Fahrenheit?

Subcooled liquid.

Saturated liquid.

Mixture of saturated liquid and vapor.

Superheated vapor.

123

According to the data given in illustration SG-0026, which of the following would be the physical state of the fluid at a gage vacuum of 25.03 inches Hg, and 138.79 degrees Fahrenheit?

Subcooled liquid.

Saturated liquid.

Mixture of saturated liquid and vapor.

Superheated vapor.

124

According to the data given in illustration SG-0026, which of the following would be the physical state of the fluid at a gage vacuum of 28.09 inches Hg, and 117.99 degrees Fahrenheit?

Subcooled liquid.

Saturated liquid.

Mixture of saturated liquid and vapor.

Superheated vapor.

125

According to the data given in illustration SG-0026, which of the following would be the physical state of the fluid at a gage vacuum of 29.00 inches Hg, and 85.21 degrees Fahrenheit?

Subcooled liquid.

Saturated liquid.

Mixture of saturated liquid and vapor.

Superheated vapor.

126

According to the illustration of a typical boiler furnace rear wall, which item number would best represent "insulating block"?

1

2

3

7

127

According to the illustration of a typical boiler furnace rear wall, which item number would best represent "insulating brick"?

1

2

3

7

128

According to the illustration of a typical boiler furnace rear wall, which item number would best represent "standard fire brick"?

1

2

3

7

129

According to the illustration, what part number identifies the "air door handle"?

4

6

7

12

130

According to the illustration, what part number identifies the "air doors"?

1

3

9

4

131

According to the illustration, what part number identifies the "diffuser"?

1

3

9

7

132

According to the illustration, what part number identifies the "igniter"?

2

3

7

9

133

According to U. S. Coast Regulations (46 CFR), water-tube boilers shall be hydrostatically tested on passenger vessels every .

year

2 .5 years

5 years

8 years

134

According to U.S. Coast Guard Regulations (46 CFR), which of the following pumps is required to have a pressure gage provided on the discharge side of the pump?

Fire pump

Boiler Feed pump

Fuel oil transfer pump

All of the above

135

Accumulation of fuel oil in the boiler double casing could be caused by .

leaking fuel oil strainers

dripping atomizers

high atomizing steam pressure

faulty steam atomizer return traps

136

Accumulation tests are conducted in order to determine the .

steam generating capacity of an individual boiler

steam relieving capacity of safety valves

maximum combined oil consumption of all oil burners installed on a single boiler

maximum combined steam generating capacity for all propulsion boilers of a single plant

137

Advances in metallurgy and improved methods of boiler tube fabrication has led to lighter tubes with wall thicknesses in the vicinity of 0.1 inches. A characteristic of these thin walled tubes is .

low tube metal temperatures

decreased probability of tube failure during normal operating conditions

better heat transfer characteristics

all of the above

138

After a boiler generating tube has been plugged, .

a hole should be made in the defective tube

the firing rate should be reduced

the steam flow rate must be increased

all of the above

139

After a boiler has been taken off the line and is cooling, the air cock is opened to .

purge all air from the steam drum

allow even cooling of the steam drum

guard against entrapped gas pockets in the superheater

prevent the formation of a vacuum within the boiler

140

After being required to plug an excessive number of leaking condenser tubes on the main condenser, what changes would you expect to observe when returning to normal steam plant sea speed operation?

Absolute pressure and hot well temperature will increase.

Absolute pressure will decrease and hot well temperature will increase.

Absolute pressure will increase and hot well temperature will decrease.

Absolute pressure and hot well temperature will decrease.

141

After patching refractory with plastic firebrick, holes are poked in the patch on 1 1/2 inch centers in order to .

prevent spalling

vent escaping moisture

allow for expansion

prevent slag buildup

142

After restoring the normal water level in a boiler following a high water casualty, you should .

immediately put the boiler on the line

immediately drain the economizer

blow down the water gage glass

completely drain the superheater

143

After routine blowing of tubes at sea, there should be a decrease in the .

fuel oil temperature

stack temperature

excess air required for complete combustion

CO2 in the stack gas

144

After steam has been raised and a boiler is being placed on the line, the superheater vent can be closed when .

main and auxiliary steam line drains are opened

the boiler steam stops have been warmed up

boiler pressure is 5 psi above line pressure

the boiler is supplying auxiliary steam

145

After the main engine has reached full sea speed, which of the following conditions could cause the water level in the boiler steam drum to keep falling?

Open cutout valves on the boiler gage glasses.

Condensate recirculating line is excessively open.

Feed pump discharge pressure is set too low.

Feed pump recirculating valve is closed.

146

After the steam leaves the low pressure turbine, it enters the .

main condenser

feed and filter tank

first-stage feed water heater

turbine extraction valve manifold

147

Air accumulated in the aftercondenser of the air ejector unit is discharged directly to the .

intercondenser

high pressure turbine

main condenser

atmosphere

148

Air accumulated in the intercondenser of the air ejector assembly is discharged directly to the .

aftercondenser

high pressure turbine

main condenser

atmosphere

149

Air for combustion is bypassed around the boiler air heater when the .

soot blowers are operating

control desuperheater is operating

combustion control system is in manual

boiler is steaming at low rates

150

Air in the main condenser is harmful because it will .

decrease the turbine exhaust steam pressure

decrease the vacuum in the main condenser

cause heat to be transferred too rapidly

cause the turbine casing to warp and bow

151

Air leaks through the inner or outer casing of a boiler could result in .

high superheater outlet temperature

low superheater outlet temperature

higher fuel consumption for normal steaming conditions

all of the above

152

Air leaks through the inner or outer casings of a boiler will .

improve fuel combustion

decrease stack temperatures

cause boiler panting

reduce boiler efficiency

153

Air removed from the main condenser is vented to the atmosphere through the .

vacuum breaker

vent condenser

atmospheric drain tank

aftercondenser

154

Air trapped within the main condenser shell is detrimental because it will .

decrease the turbine exhaust steam temperature

cause the turbine casing to warp and bow

decrease the vacuum in the main condenser

cause heat to be transferred too rapidly

155

All fuel oil service pumps are equipped with a .

relief valve on the suction side

combustion control valve on the discharge side

remote means of stopping the pump

direct suction to the double bottom tanks

156

All oil-fired main boilers with automatic safety control systems must be provided with .

a modulating pressuretrol, sensing both steam and temperature

a pyrostat measuring decreased steam temperature

one flame detector for each burner

one flame detector in each furnace

157

All oil-fired main propulsion boilers with automatic safety control systems must automatically close the burner valve when .

flame in boiler furnace is confirmed

actuated by boiler safety trip

burner is properly seated

starting trial for ignition occurs

158

All oil-fired main propulsion burners with automatic safety control systems must automatically close the burner valve when .

the flame in boiler furnace is confirmed

starting "trial for ignition"

the burner is properly seated

actuated by a boiler safety trip

159

All ships with periodically unattended machinery plants shall, in addition to the general alarm required by Coast Guard Regulations (46 CFR), be provided with a/an .

accommodation space communication system

engineer's assistance- needed alarm

remote vital system alarm

all of the above

160

All ships with periodically unattended machinery plants shall, in addition to the general alarm required by Coast Guard Regulations (46 CFR), be provided with a/an .

engineer's assistance- needed alarm

accommodation space communication system

personnel alarm

all of the above

161

Although accurate tests of boiler water for dissolved oxygen are difficult to obtain on board ship, you can be fairly certain of proper oxygen removal by .

testing frequently for total dissolved solids

maintaining low boiler water pH

giving the boiler frequent surface blows

maintaining a normal level of scavenging agents

162

An accumulation of slag build up on the boiler furnace floor will cause . I. peeling of furnace brickwork II. overheating of the furnace floor

I only

II only

Both I and II

Neither I nor II

163

An accumulation test is performed on the boiler to determine the suitability of the safety valves and the set points . I. if the boiler normal operating pressure is permanently reduced II. when the steam generating capacity is increased

I only

II only

Both I and II

Neither I nor II

164

An adequate phosphate reserve should be maintained in boiler water to .

prevent hard scale formation

reduce the blow down frequency

maintain a pH of 7

remove dissolved oxygen concentrations

165

An advantage of steam atomization compared to mechanical atomization is .

its greater turndown ratio

improved heat transfer in the boiler

the ability of the system to maintain the proper ratio of fuel and air at all rates of combustion

bleed steam is utilized thereby increasing plant efficiency

166

An advantage of using boiler furnace studded water wall tubes packed with refractory is .

thinner tubes can be used

fewer tubes are required

lower quality steel can be used

lower furnace wall operating temperature

167

An advantage of using boiler furnace studded water wall tubes packed with refractory is that .

thinner tubes can be used

thicker tubes are required

lower quality steel can be used

the use of dense firebricks is not required

168

An excessively high superheater temperature could be the result of .

excessive air

high feed water temperature

soot accumulation on the superheater

excessive steam demand

169

An explosion or flareback could occur in a boiler if .

too much excess air were supplied for combustion

the boiler firing rate exceeded the end point of circulation

the fuel being burned had been heated to the flash point

the firebox is not purged before attempting to light a fire

170

An incandescent white flame in a boiler firebox would indicate .

efficient combustion

low fuel oil temperature

excessive fuel oil pressure

too much excess air

171

An increase in the concentration of total dissolved solids in boiler water can result from .

zero water hardness

dissolved oxygen deaeration

routine treatment with phosphates

frequent prolonged surface blows

172

An increase in the pressure drop between the inlet and outlet of the feed water heater waterside, not due to a waterside obstruction, would indicate .

insufficient water velocity through the heater

a water flow rate higher than feed water heater design limits

fouling of the heater steam side

an accumulation of non- condensable gases in the steam circuit

173

An indication of a faulty superheater soot blower element is a .

low stack temperature

low superheater outlet temperature

high superheater outlet temperature

low fuel oil consumption

174

An indication of a moderate leak existing in a desuperheater is .

high auxiliary steam pressure

low auxiliary steam temperature

reduced feed water consumption

a sudden increase in make-up feed

175

An indication of excessive soot accumulation on boiler water tubes and economizer surfaces is .

low stack temperature

high stack temperature

lower feed water flow

high feed water temperature

176

An internal leak in a fuel oil heater can result in .

water contamination of the fuel oil

oil contamination of the heater drains

carbon buildup in the heater

fluctuating fuel oil pressure

177

An obstruction in the top connection of a boiler gage glass will cause the .

water level to remain constant in the glass

water level to rise slowly in the glass

gage glass to overheat and break

gage glass to be blown empty

178

Any feed water testing done on a routine basis would normally include testing for .

chloride

phosphate

electrical conductivity (total dissolved solids)

all of the above

179

Arrow "B" shown in the illustration indicates the .

regenerative air heater

retractable soot blower opening

combustion air inlet

uptakes

180

As a general rule, for proper results castable fireclay must be air cured for .

12 hours

18 hours

24 hours

48 hours or longer

181

As compared with a typical front fired boiler, which of the listed conditions represents an advantage of a top fired boiler?

No division tube wall separating the convection and radiant sections of the furnace is ever required.

Superheating diaphragms may be omitted.

More uniform heat distribution and gas dwell is obtained within the furnace.

A lower fuel flow rate can be allowed, thus increasing economy.

182

As found in a basic pneumatic automatic combustion control system, the function of a standardizing relay is to .

provide a backup means for manual control of the system

control the boiler drum water level within acceptable limits regardless of the load

introduce a control for maintaining constant superheated steam temperature regardless of boiler load

introduce a control for maintaining constant steam pressure regardless of boiler load

183

As steam accomplishes work in an engine or turbine, it expands and .

increases in superheat

decreases in superheat

decreases in volume

decreases in moisture content

184

As steam accomplishes work in an engine or turbine, the pressure of the steam is reduced because it .

diminishes in volume

becomes saturated again

expands in volume

becomes superheated again

185

As the percentage of CO2 in the stack gas decreases, you can assume that .

the fuel to air ratio is increasing

fuel is being burned with increasing economy

you are approaching secondary combustion

excess air is increasing

186

As the pH of the boiler water approaches zero, the water becomes increasingly .

soft

alkaline

neutral

acidic

187

As the rate of combustion is increased in a boiler, more steam is generated because the .

fires are hotter

mass flow rate of hot gas increases

furnace becomes hotter

flue gas turbulence decreases

188

Assume that steam has formed in a boiler in which all of the steam stop valves are closed, and the water level is held constant. When there is an increase in the temperature of the steam and water in the boiler, which of the following effects will occur on the pressure and the specific volume of the steam?

The steam pressure and volume will remain constant.

The pressure will increase and the volume will remain constant.

The pressure will remain constant and the volume will increase.

The pressure will increase and the specific volume will decrease.

189

Assuming all burners are clean and the fuel oil is at the correct temperature, it is considered good practice to adjust the excess air until a light brown haze is obtained. With the aid of a chemical based flue gas analyzer, the percentage readings (not necessarily in order) should indicate .

no CO, low O2, and high CO2

low CO2, no O2, and high CO

high CO, high CO2, and no O2

high O2, low CO, and low CO2

190

At a given pressure, erosion of steam piping and machinery will be minimized by utilizing .

superheated steam

desuperheated vapor

wet steam

saturated steam

191

At which point of the blistered boiler tube shown in illustration will the temperature be the greatest?

A

B

C

D

192

Automatic fuel shutoff to the burners of a main propulsion boiler could result from .

high boiler water level

carbon deposits on the ignition electrode

dirty flame scanner

excessive fuel return pressure

193

Auxiliary exhaust steam can generally be used as a supply for the .

air ejectors

steam atomizers

air heater supply

fuel oil heaters

194

Auxiliary steam at full operating pressure is supplied from the boiler directly to the .

turbo generators

main air ejectors

distilling plants

soot blowers

195

Before an explosion can occur in a boiler furnace, there must be an accumulation of unburned fuel, sufficient air to form an explosive mixture, and a .

space large enough for the explosion to occur

ground in the burner ignition electrode

high steam demand on the boiler

source of ignition for the explosive mixture

196

Before blowing tubes in a boiler equipped with steam soot blowers, you should .

increase the boiler water level

decrease the boiler water level

reduce the forced draft fan speed

lower the boiler steam pressure

197

Before commencing a surface blow, the boiler .

should be cold

water level should be lowered to the surface blow line

water drum should be checked for sludge

water level should be raised 2 to 3 inches (5 to 7.6 cm) above normal

198

Before giving a boiler a bottom blow, it should be taken off the line and then the .

water level initially lowered below normal

boiler steam pressure should be increased

water level initially raise above normal

boiler air cock should be cracked

199

Before giving a boiler a surface blow when underway at sea, you should .

raise the water level 2 or 3 inches above normal

lower the water level 2 to 3 inches below normal

increase forced draft air pressure to maximum

temporarily secure all burners on that boiler

200

Before giving a boiler a surface blow, you must .

open the skin valve on the blow down line

secure the fires in the furnace

lower the water level to a half glass

increase the boiler steam pressure above normal

201

Before giving a boiler a surface blow, you should .

raise the water level 2 or 3 inches above normal

lower the water level to the normal level

reduce the boiler firing rate to the minimum

take the boiler off the line and let it cool 1 hour

202

Before lighting any burner in a cold boiler you should always .

purge the furnace with air

open the furnace peephole cover

close off the burner register

reduce the forced draft pressure

203

Before using a boiler compressed air soot blower system, you should .

reduce the boiler pressure

lower the water level

decrease the forced draft fan speed

drain the soot blower pneumatic operating lines

204

Before using the steam soot blowers to blow tubes at sea, you should .

raise the water level

lower the water level

increase the firing rate

decrease the firing rate

205

Bi-color water level indicators, connected directly to the boiler drum, operate on the principle of .

different refractive properties of steam and water

special insoluble indicating fluids

different chemical properties of steam and water

different densities which result from the comparison of the varying steam pressure in the drum

206

Black smoke issuing from the boiler stack can be caused by an improper fuel/air ratio and by .

excessively high fuel pressure

low fuel temperature

high fuel temperature

low fuel pressure

207

Blisters developing on boiler tubes can be caused by .

air in the feed water

cold feed water

hot feed water

waterside scale deposits

208

Blowing down a water wall header while steaming a boiler at a high firing rate could result in .

excessive strain on boiler blow down lines

the thermo-hydraulic feed water regulator valve slamming closed

a load imbalance between other boilers on the line

an interruption in the water circulation

209

Boiler efficiency and its ability to absorb heat is limited by the need to .

maintain an excess of CO during transient firing rates

prevent excess air density at low load conditions

protect the safety valves from excessive temperature

maintain uptake gas temperature above the dew point

210

Boiler firesides must be kept free of soot accumulations because .

soot interferes with the flow of feed water

the steam drum internals will become clogged

the fuel oil heaters will become overloaded

soot insulates the boiler heating surfaces

211

Boiler forced draft pressure should be increased before blowing tubes to .

prevent condensation in the uptakes

aid in removing loosened soot

maintain a clear stack

prevent a drop in steam pressure

212

Boiler fuel oil atomizer parts should be cleaned by soaking in 'tip cleaner' or diesel fuel and .

polished with emery cloth

brushed with a steel brush

scraped with a nonabrasive tool

scraped with a modified table knife

213

Boiler fuel savings gained by the use of an economizer can amount to .

three percent for each 5F rise in feed water temperature

one percent for each 10F rise in feed water temperature

one half percent for each 15F rise in feed water temperature

three percent for each 20F rise in feed water temperature

214

Boiler furnace brickwork can be fractured and broken by thermal shock caused by .

leaving the registers open on a hot boiler

load changes on the boiler while answering bells

allowing the furnace to cool too slowly

cold feed water passing through the boiler economizer

215

Boiler refractories previously baked out and fired are most sensitive to .

rapid cooling

sustained high furnace temperature

rapid heating

radiant heat of the burner

216

Boiler refractory anchor bolts are secured to the casing by .

hooked ends inserted into pads welded to the casing

slots in the firebrick

high strength tensile fasteners

furnace mortar

217

Boiler refractory firebrick is secured to the casing by .

slots in the brick engaging anchor bolts

high strength tensile fasteners

studding on the water wall tubes

fast drying plastic refractory mortar

218

Boiler screen tubes are used to protect which of the listed components from high furnace temperature?

Superheater

Refractory

Wall tubes

Steam drum

219

Boiler stack gas temperature could be higher than normal if .

leakage exists in the inner and outer casing

defects exist in the burner cone refractory

fuel oil temperature is excessively high

secondary combustion occurs in the gas passages

220

Boiler stack gas temperatures will be higher than normal when .

fuel temperature at the burners is excessively high

not enough excess air is being supplied for combustion

secondary combustion is occurring in the gas passages

internal water wall refractory baffles have failed

221

Boiler superheaters are designed to .

raise the sensible heat of the steam

increase the overall mechanical efficiency of the plant

provide continuous steam flow to the control desuperheater

raise the latent heat of the steam

222

Boiler tube failures can result from .

corrosion

overheating

mechanical stress

all of the above

223

Boiler water hardness is increased by .

zero alkalinity in the water

scale forming salts in the feed water

dissolved gases in the water

improper operation of the DC heater

224

Boiler water samples should be circulated through a cooling coil prior to analysis because .

this prevents the boiler water from flashing into steam as the sample is collected

it reduces the amount of suspended matter that frequently finds its way into the dead end lines

the cool sample has a higher conductivity measurement and the total dissolved solids in the water are easier to identify

the degree of acidity as measured on the pH recorder is amplified by cool water temperatures

225

Boilers equipped with steam atomized burners can be operated without changing burner tips because steam atomization .

maintains the oil at ignition temperature

finely atomizes fuel oil over a band of fuel oil system pressures

automatically cleans the burner tips and eliminates fouling

regulates itself by responding to the position of the main engine throttles

226

Boilers equipped with steam atomizers can operate over a wide load range without cutting burners in and out because .

steam maintains the oil at the fire point temperature

atomizing steam pressure is held constant for all load ranges

it is not necessary to regulate fuel oil pressure at the burners with this system

steam velocity aids in the atomizing of fuel oil over a wide range of fuel pressures

227

Boilers equipped with steam atomizers can operate over a wide load range without cutting burners in and out because .

steam maintains the oil at the fire point temperature

atomizing steam pressure is held constant for all load ranges

it is not necessary to regulate fuel oil pressure at the burners with this system

the degree of atomization is not dependent upon fuel oil pressure

228

Brick bolts, tile bolts, and pennant anchors are attached to the inner casing by .

retaining clips

fillet welds

tack welds

All of the above are correct.

229

Bunker "C" fuel oil is heated prior to atomization to .

increase the heating value

increase its specific gravity

reduce its viscosity

reduce the flash point

230

Burning fuel with entrained saltwater, will cause a glassy slag formation on furnace refractory. This slag will .

form a protective coating thus increasing its life

seal refractory joints thereby improving its function

expand at a different rate and result in damaged refractory

increase the furnace efficiency because of reduced firebox turbulence

231

Calcium minerals in boiler water are precipitated out of solution by the use of which of the listed chemicals?

Sodium phosphate

Sodium hydroxide

Phenolphthalein

Caustic soda

232

Carbon deposits in a fuel oil heater are caused by .

low fuel oil temperature

high fuel oil temperature

low fuel oil viscosity

high fuel oil pressure

233

Carbon deposits on the boiler burner throat ring is usually caused by .

too much excess combustion air

a faulty ignition electrode

a dirty atomizer sprayer plate

the burner cycling on and off

234

Carbon deposits on the diffuser and register throat ring of a burner .

interfere with air flow around the burner

cause pre-ignition of the atomized fuel

allow heat loss to the boiler casing

are of no consequence and may be left in place until a fireside inspection allows time for removal

235

Carbon dioxide dissolved in boiler water is dangerous in a modern power boiler because the gas .

forms carbonic acid which attacks the watersides

breaks the magnetic iron oxide film inside boiler tubes

combines with sulfates to cause severe waterside pitting

combines with oxygen to cause severe waterside scaling

236

Carbonization of the conductive surfaces of a fuel oil heater results in reduced heating capacity because .

a fluid film layer covers the solid contaminants and increases heat transfer

the relative velocities of the fluids must be decreased causing a corresponding loss of heat transfer

the thermal conductivity of solidified contaminants is poor

radiational heat transfer becomes severely impaired

237

Carryover in a marine boiler can be caused by .

boiler water contaminants

low boiler water alkalinity

a high concentration of hydrazine in the boiler water

operating under low load conditions for extended periods

238

Chemicals are added to boiler feed water to .

reduce the frequency of blow downs

prevent precipitation of sludge

decrease heat transfer

precipitate dissolved oxygen

239

Chemicals are added to boiler water by injecting them .

as a powder into the mud drum

as a powder into the steam drum

in solution into the main feed line

in solution through the chemical feed pipe

240

Chemicals are added to boiler water in order to .

reduce oxygen corrosion

reduce the total dissolved solids content

decrease the necessity for blow downs

eliminate dissolved chlorides

241

Chemicals are added to boiler water to .

eliminate the need for blow downs

stabilize feed water if a boiler becomes salted up

prevent scale forming deposits

maintain an acidic condition in the feed water

242

Circulation in a water-tube boiler is caused by the difference in the .

area and length of the water-tubes

densities of the circulating water

heights of the boiler drum

angle of inclination of the tubes

243

Circulation of boiler water to the water wall tubes is maintained by the .

water screen tubes

risers

downcomers

generating tubes

244

Circulation of water and the steam/water mixture within a natural circulation boiler is retarded by .

large changes in steam density

fluid friction in the downcomers, drums, generating tubes, and headers

high feed water pressure

back pressure in the steam drum acting on the user tubes

245

Clean low pressure steam drains are collected in the .

deaerating feed water heater

contaminated drain inspection tank

atmospheric drain tank

main condenser hot well

246

Coast Guard Regulations (46 CFR Part 52) concerning boiler superheater safety valves require that the valve .

be set at a lifting pressure that is higher than the drum safety valve

have a drain opening tapped for not less than 1/4 in. NPS

be constructed with a cast iron body

have a threaded inlet connection if greater than 2 in. NPS

247

Coast Guard Regulations (46 CFR Part 56) permit copper pipe to be used for steam service subjected to a maximum pressure and temperature of .

350 psi and 460F

350 psi and 406F

250 psi and 460F

250 psi and 406F

248

Coast Guard Regulations (46 CFR Part 56) require that new fuel oil service piping between pumps and burners be subjected to .

a hydrostatic test of 1.5 times the maximum allowable pressure but not less than 500 psi (3447 kPa)

a hydrostatic test of 1.25 times the maximum allowable pressure with the relief valves closed

spot radiographic examination of portions of the finished weld joints

a hydrostatic leak test to the design pressure specified by the Coast Guard

249

Coast Guard Regulations (46 CFR) concerning marine boilers, require the installation of a safety valve on the .

auxiliary steam outlet

desuperheated steam outlet

preheated steam outlet

superheated steam outlet

250

Coast Guard Regulations (46 CFR) concerning superheater safety valves require that the valve .

be set at a pressure higher than the drum safety valves

can only be operated by a pilot valve

nominal size is not less than 1.5 inches nor more than 4 inches

is not set at a pressure less than the feed pump relief valve

251

Coast Guard Regulations (46 CFR) for boiler fuel oil service systems require .

fuel oil heaters for boilers burning fuels with low viscosity

fuel oil service tanks to overhang boilers to utilize heat radiated from the boilers for greater efficiency

machinery driving fuel oil service pumps to be fitted with remote controls so that they may be stopped in the event of a fire

all piping between service pumps and burner fronts to be located below the floor plates to eliminate fire hazards

252

Coast Guard Regulations (46 CFR) for boiler fuel oil service systems, require that .

discharge piping from the service pumps to the burners must be of schedule 60 seamless steel

the return line from the burners must be arranged so that suction piping cannot be subject to discharge pressure

the fuel oil service pump relief valve must discharge to a wing tank

the suction strainer must be a simplex type

253

Coast Guard Regulations (46 CFR) for boiler safety valves, require that .

no valves of any type shall be installed in the leak off from drains or drain headers

all safety valve gags or clamps must be carried on board the vessel at all times

the final setting of the safety valves shall be checked and adjusted under steam pressure

All of the above are correct.

254

Coast Guard Regulations (46 CFR) permit repairs and adjustments to boiler safety valves while installed on a main propulsion boiler and may be made by .

the chief engineer in an emergency

any competent person on the ship

an approved repair facility only

only the safety valve manufacturer

255

Coast Guard Regulations (46 CFR) prohibit which of the following pipe fittings from being installed in fuel oil service discharge piping?

Pipe unions

Screwed bonnet valves

Street ells

Bolted flange joints

256

Coast Guard Regulations (46 CFR) regarding hydrostatic testing of main steam piping state that .

the hydrostatic test shall be applied from the boiler drum to the throttle valve

not less than fifty percent of the lagging shall be removed each time the hydrostatic test is applied

the hydrostatic test pressure must be maintained on the piping for a minimum of one hour

a pipe with a nominal size of six inches or more is not required to be hydrostatically tested

257

Coast Guard Regulations (46 CFR) require that alarm systems be provided for superheaters whose operating outlet temperature is capable of exceeding .

550F (288C)

650F (343C)

750F (399C)

850F (454C)

258

Coast Guard Regulations (46 CFR) require that boiler mountings shall be removed and studs examined by a Coast Guard inspector .

every 4 years

every 10 years

when the boiler is hydrostatically tested

at each inspection for certification

259

Coast Guard Regulations (46 CFR) require that in preparing a water-tube boiler for a hydrostatic test, you should fill the boiler with water at a temperature of not less than .

50F and not more than 100F

70F and not more than 160F

60F and not more than 120F

100F and not more than 200F

260

Coast Guard Regulations (46 CFR) require that main steam piping must be hydrostatically tested at specified intervals. If the pipe insulation cannot be removed during this test, the piping shall be tested at .

1 1/4 times the maximum allowable working pressure and the pressure maintained for 10 minutes

1 1/2 times the maximum allowable working pressure and the pressure maintained for 20 minutes

operating pressure and temperature and the pressure maintained for 1 hour

a pressure and temperature specified by a Coast Guard marine inspector

261

Coast Guard Regulations (46 CFR) require that quick- closing valves on a fuel oil service system should be installed as close as is practicable to the .

suction side of the fuel oil pump

boiler front fuel oil header

fuel oil settling tanks

fuel oil service heaters

262

Coast Guard Regulations (46 CFR) require that the design pressure of an economizer integral with the boiler and connected to the boiler drum without intervening stop valves shall be at least equal to .

the feed pump shut off head pressure

110% of the drum safety valves highest set pressure

125% of the boiler hydrostatic test pressure

150% of the boiler design test pressure

263

Coast Guard Regulations (46 CFR) require that the final setting of boiler safety valves be conducted in presence of the .

Chief Engineer

COTP

OCMI

Marine Inspector

264

Coast Guard Regulations (46 CFR) require the duplex fuel oil discharge strainers installed in boiler fuel oil service systems to be .

located so as to preclude the possibility of spraying oil on the burner or boiler casing

as close to the fuel oil service manifold as practicable

enclosed in a drip-proof vented enclosure to reduce the possibility of fire

a positive venting system that will return any vapors to the pump suction

265

Coast Guard Regulations (46 CFR) require the temperature of the water leaving an oil fired, cast iron, low pressure, hot water heating boiler must not exceed .

190F (87.8C)

210F (98.9C)

230F (110.0C)

250F (121.1C)

266

Coast Guard Regulations (46 CFR) require unfired pressure vessels with manholes to be hydrostatically tested .

every four years

every eight years

at each certification inspection

at the discretion of the marine inspector

267

Coast Guard Regulations (46 CFR) require unfired pressure vessels with manholes to be hydrostatically tested .

every 4 years

every 8 years

at each certification inspection

at the discretion of the marine inspector

268

Coast Guard Regulations (46 CFR) requires machinery driving the fuel oil transfer and fuel oil service pumps to be fitted with a remote means of stopping that machinery .

within the space concerned

outside of the space concerned

at the throttle station

within the fire room

269

Coast Guard Regulations (46 CFR) state that a marine inspector may require a boiler to be drilled or gaged to determine actual thickness .

at the first inspection for certification

to preclude nondestructive testing methods

at any time its safety is in doubt

when boiler drum thickness has decreased by 5%

270

Coast Guard Regulations (46 CFR) state that main propulsion water-tube boilers are not required to be fitted with a surface blow off valve if the design pressure is .

300 psig (2169 kPa) or over

350 psig (2413 kPa) or over

500 psig (3548 kPa) or over

550 psig (3893 kPa) or over

271

Coast Guard Regulations (46 CFR) state that main propulsion water-tube boilers are not required to be fitted with a surface blow off valve if the design pressure is .

more than 200 psig (1436 kPa)

more than 250 psig (1795 kPa)

more than 300 psig (2169 kPa)

more than 350 psig (2513 kPa)

272

Coast Guard Regulations (46 CFR) state that main propulsion water-tube boilers are required to be fitted with a surface blow off valve if the design pressure is .

less than 200 psig (1436 kPa)

less than 250 psig (1795 kPa)

less than 300 psig (2169 kPa)

less than 350 psig (2513 kPa)

273

Coast Guard Regulations (46 CFR) state that the temperature of the water for a hydrostatic test on a fire-tube boiler will be not less than 70 and not more than .

90F

100F

130F

160F

274

Coast Guard regulations require that the relieving capacity of boiler safety valves must be checked .

at least once a year

at least once every 4 years

when the generating capacity of the boiler is increased

when repairs have been made to the safety valves

275

Coast Guard regulations require that the superheater safety valves . I. and the drum safety shall have a total rated capacity not less than the maximum generating capacity of the boiler II. be set and adjusted under pressure, regardless of the pilot pressure source

I only

II only

Both I and II

Neither I nor II

276

Coast Guard Regulations, 46 CFR Part 54, require steam safety and relief valves to be provided with a substantial lifting device, capable of lifting the disc from its seat at what percentage of the set pressure?

0%

25%

75%

90%

277

Combustion control systems on automatic boilers are designed to prevent immediate burner ignition after a normal or safety shutdown in order to allow time for .

the furnace to be purged

electric charge buildup in the igniter

the fuel pump to start

the drum level to equalize

278

Combustion gases can leak into the fire room through .

desuperheater seals

fouled burner registers

idle burner assemblies

soot blower swivel tube packing glands

279

Compared to the return flow oil burner system, an internally mixed steam atomizer requires .

higher fuel oil viscosity

less excess air

higher air velocity

greater turbulence in the air/oil stream

280

Component "B" shown in the illustration is properly identified as the .

drumhead

wrapper sheet

tube sheet

drum crown

281

Condensate accumulating in the steam side of a fuel oil heater could result in .

overheating

scale accumulation

corrosion

immediate oil contamination of the condensate

282

Condensate accumulation in the steam side of a fuel oil heater could result in .

scale accumulation in an operating heater

water contamination of the fuel oil

reduced heating capacity in an operating heater

annealing of the heater tube bundles

283

Condensate from fuel oil heating coils return to the .

feed water heater

engine room bilge

reserve feed tank

drain inspection tank

284

Condensate is pumped from the condenser to the DC heater instead of directly to the boiler because .

boiler feed pumps must operate with a negative suction head

suspended solids in the condensate must be eliminated

condensate should be deaerated before entering the boiler

condensate at condensing temperature is too hot and will cause thermal stress in the boiler

285

Condensate pumps have distinctly noticeable characteristics and can usually be recognized by their .

speed-limiting governors and closed impellers

large suction chambers and impeller eyes

multiple impellers and pump shaft positions

open impellers and power ends

286

Condensate return lines from tank heating coils are led to the .

atmospheric drain tank

main condenser

DC heater

contaminated drain system

287

Contaminated steam generators in a contaminated drain system are usually .

single effect

double effect

triple effect

multistage flash type

288

Cooling water to the vent condenser in a DC heater is supplied by the .

salt water circulator

main feed pump

feed booster pump

main and/or auxiliary condensate pump

289

Corrosion due to electrolytic action in modern water-tube boilers is uncommon because .

boiler water is a strong electrolytic

alkalinity control treatment prevents electrolytic action

boiler components are generally constructed of similar metals

electrolytic action cannot occur at high pressure

290

Corrosion of the flue gas side of the economizer can be a result of the . I. stack gas temperature being lower than the dew point II. feed water temperature being excessively cool

I only

II only

both I and II

neither I or II

291

Cratering and water tracking in boiler tubes is caused by .

burning a fuel with a high vanadium content

baked on slag deposits

soot corrosion

water trapped between tubes and refractory

292

Damage to deck machinery from water hammer developing in the steam lines can be prevented by .

installing a steam strainer in all exhaust lines

opening machinery throttle valves rapidly

draining the steam piping before operating any machinery

ensuring that all drain lines are properly insulated

293

Damaging scale can form on the interior of superheater tubes as a result of .

leaks from the desuperheater

high superheater outlet temperature

insufficient steam flow through the superheater

boiler water carryover

294

Deaeration of condensate primarily occurs in what section of the illustration shown.

DFT

main condenser hot well

distilled water tank

first stage feed heater

295

Depending upon the design of the boiler, the constant pressure maintained at the steam drum or the superheater outlet is known as the .

designed maximum pressure

overload pressure

operating pressure

output pressure

296

Desuperheated steam can be found at the .

main steam stop

generator steam stop

spray attemperator outlet

high pressure turbine steam chest

297

Desuperheated steam from the control desuperheater is returned to the main superheater to control the outlet temperature by the action of .

the superheater temperature control valve

the superheater flow valves

an orifice in the superheater inlet header

a diaphragm type pressure controller

298

Dirty generating tube surfaces may cause higher than normal superheater outlet temperatures because .

the boiler must be over fired to maintain the required rate of steam generation

the temperature of the gas leaving the generating banks will be lower than normal

the screen tubes absorb excessive heat and transfer the increased temperature to the superheater

gas laning will result causing overheating of the superheater

299

Discharging an excessive amount of cold water into the DC heater during normal steaming conditions could cause .

flashing at the feed pump suction

excess oxygen in the feed water

water hammer in the economizer

increased back pressure

300

Discharging an excessive amount of make-up feed water into the DC heater during normal steaming conditions could cause .

loss of feed pump suction

decreased auxiliary exhaust pressure

water hammer in the economizer

increased air ejector discharge temperature

301

Dissolved and suspended solids in boiler water are kept at minimum levels by .

using only volatile chemicals

frequently blowing down the boiler

treating the boiler water with phosphates

the introduction of oxygen scavenging chemicals

302

Dissolved oxygen can be removed from the boiler water by .

frequent surface and bottom blows

dumping and refilling the boiler weekly

passing the water through absorbent filters

treating the water with chemical scavengers

303

Dissolved oxygen entrained in the feed water entering a boiler can cause .

erosion

localized pitting

caustic embrittlement

acid corrosion

304

Dissolved oxygen in the condensate can result from .

steam leaks into the gland leakoff

air leaks through the turbine glands

improper operation of the gland exhauster

vapor lock in the condensate pump

305

Dissolved oxygen in the condensate is generally attributed to .

steam leaks into the gland leakoff

improper operation of the gland exhauster

adding make up feed

vapor lock in the condensate pump

306

Downcomers are frequently mounted outside the boiler casing on a water-tube boiler for the purpose of .

reducing heat in the downcomers and improving water circulation

improving the cooling of the lower tube banks

causing suspended solids in the boiler water to settle in the water drums

providing for easy maintenance and repair

307

Downcomers are installed between the boiler inner and outer casing to . I. increase circulation rates II. decrease the amount of heat that they can absorb from the furnace

I only

II only

Both I and II

Neither I or II

308

Downcomers are installed between the inner and outer boiler casings to . I. increase the end point of carry over II. decrease the end point of circulation

I only

II only

Both I and II

Neither I or II

309

Downcomers are installed between the inner and outer boiler casings to . I. increase the end point of combustion II. increase the end point of carry over

I only

II only

Both I and II

Neither I or II

310

Downcomers are installed between the inner and outer boiler casings to . I. increase the end point of combustion II. increase the end point of circulation

I only

II only

Both I and II

Neither I or II

311

Downcomers are used in modern boilers to .

circulate water to the mud drum

cool the superheater

preheat the feed water

remove soot from the firesides

312

Downcomers installed in water-tube boilers function to .

distribute feed water within the water drum

decrease the end point for moisture carryover

accelerate the generation of superheated steam

accelerate water circulation in the boiler

313

Downcomers installed in water-tube boilers function to .

distribute feed water within the water drum

decrease the end point for moisture carryover

cool the tubes adjacent to the burner throats

ensure proper circulation to the water wall headers

314

Due to of the curing characteristics of plastic refractory, its use should be avoided in .

high temperature areas

burner fronts

small repairs

low temperature areas

315

During cold ship start-up, you should open the feed water outlet and condensate valves to a DC heater in order to .

avoid running the feed pump 'dry'

expel non-condensable vapors from the vent

thoroughly atomize incoming condensate

prevent excessive pressure

316

During each two and one-half year inspection, which test or examination of a cargo vessel water tube boiler is required by Coast Guard Regulations (46 CFR)?

Accumulation test

Uptakes structural survey

Hydrostatic test

Fireside inspection

317

During initial starting of the standby turbine-driven boiler feed pump, which of the listed valves should remain closed?

Turbine exhaust valve

Turbine steam supply valve

Pump suction valve

Pump discharge check valve

318

During initial starting of the standby turbine-driven feed pump, which of the listed valves should remain closed?

Pump discharge check valve

Turbine steam supply valve

Turbine exhaust valve

Pump suction valve

319

During normal operation, the steam flow from the auxiliary exhaust line to the DC heater can be closely related to the .

spring pressure of the spray valves

water level in the DC heater reservoir

the temperature and quantity of the condensate flow to the DC heater

rate of evaporation in the DC heater

320

Economy and efficiency in the operation of a marine boiler have traditionally been characterized by .

a clear stack (invisible stack gases)

maintaining the fuel oil temperature as high as possible

a light brown haze from the stack

a slight wisp of white smoke from the stack

321

Efficient boiler operation is indicated when the percentage by volume of carbon dioxide present in combustion gases is between .

1 and 10

10 and 11

12 and 14

15 and 17

322

Efficient combustion in a boiler is indicated by a .

white haze

brown haze

yellow haze

black haze

323

Eight (8) ounces of oxygen, dissolved in 500,000 pounds of water, is a concentration of .

1.0 ppm

4.0 ppm

8.0 ppm

16.0 ppm

324

Electrolytic corrosion in the condenser circulating water system can be reduced by .

decreasing the velocity of the circulating water through the waterboxes

using zinc plates in the waterboxes

chemically treating the condensate formed in the hot well

decreasing the volume of water in the system

325

Engineering Control Centers for minimally attended machinery plants shall, in addition to the general alarm required by Coast Guard Regulations (46 CFR), be provided with a/an .

engineer's assistance- needed alarm

gyrocompass system alarm

satellite telecommunications alarm

all of the above

326

Engineering Control Centers for minimally attended machinery plants shall, in addition to the general alarm required by Coast Guard Regulations (46 CFR), be provided with a/an .

satellite telecommunications alarm

remote vital system alarm

gyrocompass system alarm

all of the above

327

Engineering Control Centers for minimally attended machinery plants shall, in addition to the general alarm required by Coast Guard Regulations (46 CFR), be provided with a/an .

gyrocompass system alarm

satellite telecommunications alarm

personnel alarm

all of the above

328

Excess air must be provided to an operating boiler to allow for .

complete combustion of fuel

fluctuations in boiler steam demand

heat losses up the stack

all of the above

329

Excess free oxygen in the boiler feed water can be the result of .

improper operation of the DC heater

steam leaks through the turbine glands

improper operation of the gland exhauster

vapor lock in the boiler feed pump

330

Excessive accumulation of carbon deposits on a boiler burner throat ring and diffuser could result in .

too much excess combustion air

a reduced boiler fuel oil pressure

a decrease in boiler efficiency

increased heat transfer and overheating

331

Excessive alkalinity of boiler water will cause .

caustic embrittlement

scale formation

calcium carbonate precipitation

sodium sulfite reacting with dissolved oxygen

332

Excessive carbon dioxide formed by improper chemical treatment in the boiler, may cause corrosion in the .

condensate lines

boiler superheater tubes

boiler generating tubes

main and auxiliary steam lines

333

Excessive combustion air in a boiler is indicated by the flame ends appearing as a/an .

shower of sparks

orange colored flame

dull red or black flame

light brown flame

334

Excessive condensate depression can result in .

overheated air injectors

high condensate discharge temperature

decreased plant operating efficiency

insufficient condensate sub cooling

335

Excessive condensate depression will result in .

increased oxygen rejected in the condenser

decreased steam consumption

excessive condensate temperatures

increased air absorption by the condensate

336

Excessive foaming in a steaming boiler can cause damage to the .

superheater

desuperheater

economizer

internal feed pipe

337

Excessive recirculation of condensate should be avoided, as it can cause .

excessive cooling of the condensate

overheating of the air ejectors

the condenser hot well to be completely drained at low speeds

overheating of the vent condenser

338

Excessive soot accumulations on boiler generating tube surfaces can result in .

high superheater outlet temperature

incomplete combustion in the furnace

reverse circulation of the steam and water mixture

low stack gas temperature

339

Excessive soot deposits on the heating surfaces of a boiler uncontrolled interdeck superheater would be indicated by .

decreased fuel oil and air requirements

increased stack temperature

increased desuperheated steam temperature

increased superheater outlet temperature

340

Excessive water flow beyond the design limits of a feed water heater, will be indicated by a/an .

increase in the pressure drop between the water inlet and outlet

decrease in the pressure drop between the water inlet and outlet

excessive gas liberation from the waterside vents

high steam temperature at the heater outlet

341

Excessive water loss from the main feed system can be caused by .

an atmospheric drain tank trap frozen in the closed position

excessive recirculation of condensate from the outlet of the air ejector condenser to the main condenser

a vapor bound main condensate pump

a leak in the desuperheater internal gasket

342

Excessively hot water returning to an atmospheric drain tank indicates .

a heating coil has ruptured

a steam trap is hung open

there is a loss of circulating water

the condensate recirculating valve is open

343

Excessively hot water returning to an atmospheric drain tank indicates .

the condensate recirculating valve is open

there is a loss of circulating water

a steam trap is hung open

a heating coil has ruptured

344

Failure of the fuel oil service pump to maintain fuel oil flow to the burner could be caused by .

a high relief valve setting

excessive return line oil pressure

dirty fuel oil strainers

excessive fuel pump speed

345

Failure to remove calcium and magnesium from feed water before it reaches the boiler can result in tube .

scaling

pitting

sludging

erosion

346

Feed water heaters are used aboard steam vessels to reduce thermal shock to the boiler and to .

increase plant mechanical efficiency

act as a heat sink for turbine bleed steam

improve thermal efficiency

reduce back pressure in the auxiliary exhaust line

347

Feed water is deaerated to prevent .

cavitation in the feed pump

corrosion in the boiler

loss of system vacuum

all of the above

348

Ferrous sulfate tends to go into solution in boiler water when the value of the hydrogen ion concentration increases. Consequently, the water in a 900 psi boiler should be .

pure with zero pH value

pure and treated to a pH value of 4.0 to 4.5

maintained at a pH value of 7.0

pure and treated to a pH value of 10.5 to 11.0

349

Fine adjustments to a boiler combustion control system, to bring about near perfect combustion, should be made by manually adjusting the .

fuel oil back pressure

air volume regulators

fuel/air ratio knob

forced draft fan dampers

350

Fireside burning of boiler superheater tubes is a direct result of .

combustion gases impinging on the tubes

fuel droplets striking the hot tubes

heating carbon steel tubes above 750F

tubes becoming steam bound

351

Fireside burning of boiler tubes can be a result of .

slag deposit

improper atomization

soot accumulations

waterside deposits

352

Fireside burning of boiler tubes is usually the direct result of .

soot accumulations on a tube bank

overheating due to poor heat transfer

oxygen corrosion

slag accumulation on the firesides

353

Fireside burning of boiler tubes is usually the direct result of .

high furnace temperatures

gas laning in tube banks

oxygen corrosion of metallic surfaces

overheating due to poor heat transfer

354

Flame scanners are used with boiler combustion control systems to monitor flame quality and to .

shut off the fuel supply if flame failure is detected

secure the fuel oil service pump in the event of a floor fire

secure the forced draft fan in the event of a flame failure

regulate the fuel/air ratio controller for more efficient combustion

355

Flooding of the DC heater, due to the addition of excessive makeup feed, is normally corrected by the use of .

a condensate pressure regulating valve

a thermostatic steam regulating valve

the feed pump recirculating line

a manual or automatic dump valve to the reserve feed tank or distilled tank

356

Fluctuations in the atomizing steam pressure at the burners could be caused by a/an .

malfunctioning condensate drain in the atomizing steam system

incorrectly assembled air register

partially closed atomizing fuel valve

partially opened recirculating valve

357

Fluctuations in the atomizing steam pressure at the burners could be caused by a/an .

malfunctioning steam trap in the atomizing steam system

incorrectly assembled air register

partially closed atomizing fuel valve

partially opened recirculating valve

358

Foaming and moisture carryover in a boiler can be caused by an .

excessive amount of dissolved solids in the boiler water

excessive acidity level in the boiler water

inadequate amount of dissolved oxygen in the boiler water

inadequate alkalinity content in the boiler water

359

Foaming in a boiler can be caused by .

high total solids

high alkalinity

excessive phosphate

all of the above

360

Foaming in boiler water is a result of .

carryover

excessive suspended solids

low water level

excessive surface blows

361

Foaming in boiler water is caused by .

neutral water

acidic contamination

high boiler water alkalinity

low boiler water alkalinity

362

From which of the areas listed are condensate drains normally collected and returned to the atmospheric pressure drain system?

Steam whistle separator/trap

Each main feed pump steam supply line

Steam systems operating in excess of 150 psi

Main and auxiliary air ejector aftercondensers

363

From which of the areas listed are condensate drains normally collected and returned to the low pressure drain system?

Steam whistle separator/trap

Each main feed pump steam supply line

Steam systems operating in excess of 150 psi

Main and auxiliary air ejector aftercondensers

364

Fuel oil accumulation in a boiler double front is generally caused by .

leaking fuel oil strainers

low return line pressure

dripping atomizers

insufficient air

365

Fuel oil atomizers are used in boilers to .

control the temperature of fuel entering the furnace

control the amount of air entering the furnace

mix air and fuel together

break fuel oil into a fine spray

366

Fuel oil is heated before atomizing to .

reduce the viscosity

increase the viscosity

raise the fire point

lower the flash point

367

Fuel oil is heated before it reaches the burners to .

increase its heating ability

make it atomize properly

raise its ignition temperature

boil off water contamination

368

Fuel oil is transferred from storage tanks to the settling tanks to allow for .

blending with atomizing steam

purging of any large air bubbles that have formed

heating to separate water and sediment

heating to the correct temperature for proper atomization

369

Fuel oil is transferred to the settling tanks for .

the purpose of removing any volatile gases present in the fuel

purging of any large air bubbles that have formed

heating to allow water and sediment to settle out

heating to the correct temperature for proper burner atomization

370

Fuel oil may be discovered in the contaminated drain inspection tank when the .

steam atomizer leaks

fuel oil heater leaks

DC heater leaks

steam operated fuel oil pump leaks

371

Fuel oil passing through the burners is divided into fine particles by the .

diffuser

air register

sprayer plate

air foils

372

Fuel oil settling tanks are used to .

store oil for immediate use

separate water and solids from the fuel

make stripping of sludge and water from fuel oil easier

all of the above

373

Fuel oil settling tanks are used to .

store oil for immediate use

precipitate out water and solids

facilitate the stripping of sludge and water

all of the above

374

Fuel oil solenoid valves at the burner fronts should be of the manual reset type to .

permit the operator to secure each burner during a blackout

permit the operator to secure each burner after a blackout

prevent the furnace filling with oil during a power failure

prevent the furnace filling with oil after restoration of power

375

Fuel oil viscosity to the atomizer can be reduced by .

increasing the fuel oil heater steam supply

mixing heavier oil with the fuel

changing the atomizer orifice size

increasing fuel oil pressure

376

Gasket leakage around boiler handholes may be caused by .

improper positioning of the gasket

pitted seating surfaces

loose dogs

all of the above

377

Generally, a 12% to 14% content of carbon dioxide in boiler flue gases indicates .

too much excess air

a high vanadium content in the fuel oil

proper combustion of the fuel oil

carbon deposits in the uptakes

378

Heat blisters forming on the first row of the generating tubes are caused by .

fireside deposits

low water level

flame impingement

waterside deposits

379

Heat introduced to the condenser by exhausting steam is removed by the circulation of .

reserve feed water

cold condensate

low pressure drains

seawater

380

Heating the fuel oil to an excessively high a temperature in a fuel oil heater will cause .

a loss of fuel oil suction

over firing the boiler

leakage at the burners

fouling of the heater

381

Heavy slagging and high temperature corrosion of boiler tubes can result from using a fuel oil with high amounts of .

ash

sodium chloride salts

vanadium salts

all of the above

382

High boiler water level can cause carryover and .

damage to the economizer

warped screen tubes

warped water wall tubes

damage to the superheater tubes

383

High pressure and low pressure drain systems are part of the .

condensate drain system

auxiliary turbine bleed system

contaminated drain system

boiler drain system

384

High pressure steam drains are normally discharged to the .

DC heater

atmospheric drain line

reserve feed tank

drain and inspection tank

385

High pressure steam drains from systems operating at above 150 psi are normally collected in the .

atmospheric drain tank

contaminated drain inspection tank

deaerating feed water heater

distilled water tank

386

High salinity can be reduced in a steaming boiler by adding caustic soda, phosphate, and then .

using the continuous blow down

steaming at a low firing rate for 24 hours

adding hydrazine to control dissolved oxygen

adding calcium carbonate to precipitate solids

387

High temperature at the superheater outlet would be caused by .

outer casing leakage

improper turn down ration

rapid fuel oil atomization

excessive excess air

388

High temperature at the superheater outlet would NOT be caused by .

outer casing leakage

high feed water temperature

poor fuel oil atomization

too much excess air

389

How is a diaphragm type steam whistle protected from damage due to entrained condensate?

High temperature steam is used in the whistle.

Condensate drains from the horn each time the whistle is blown.

A water separator is installed in the steam supply line.

The diaphragm separates condensate from steam.

390

How is boiler water forced to circulate faster in accelerated natural circulation boilers, than in free natural circulation boilers?

Increasing the density of the water.

Installing a water circulating pump, such as a hydro-kineter.

Increasing the inclined angle of the generating tubes.

Increasing the surface area of the economizer exposed to the combustion gases.

391

How is the nozzle in a nozzle reaction safety valve held in place?

Press fit

Lock nut

Machine threads

Spot weld

392

Identify the system shown in the illustration.

Bleed steam

Auxiliary steam

High pressure drains

Auxiliary condensate

393

Identify the system shown in the illustration.

Bleed steam

Auxiliary steam

High pressure drains

Auxiliary condensate

394

If a boiler begins to pant and vibrate you should .

check the fuel oil service pumps

secure the fires

increase the air

reduce the steam demand

395

If a boiler fire is blown out by a flareback, you should immediately .

increase the forced draft blower speed

start the standby fuel oil pump

secure the fuel supply to the boiler burners

relight the fires with a torch

396

If a boiler generates saturated steam at 125.3 psig, how much heat is required to change the water into steam if the feed water temperature is 240F?

30.5 Btu/lb

116.5 Btu/lb

582.7 Btu/lb

983.4 Btu/lb

397

If a boiler is being operated with the inlet feed water bypassing the economizer, which of the following is true?

The fuel consumption will increase for the same boiler load.

There is always the danger of burning the economizer tubes.

Less heat is actually being transferred to the superheated steam because of the decrease in feed water flow

all of the above

398

If a boiler is being steamed at a high firing rate, blowing down a water wall header without taking any other precaution could result in .

excessive strain on boiler blow down lines

erratic operation of the automatic feed water regulating valve

load imbalance between other boilers on the line

interruption of water circulation

399

If a boiler is brought on the line with its steam pressure much higher than that of the boiler already on the line, there is danger of .

thermal shock

priming and carryover

low water

an overloaded superheater

400

If a boiler is panting, which of the following actions should be taken?

Decrease the air pressure to the burners.

Increase the air pressure to the burners.

Increase the fuel oil pressure.

Increase the fuel oil temperature.

401

If a boiler is smoking black and increasing the boiler front air box pressure does not reduce the smoke, the cause can be .

forced draft fan failure

dirty atomizers

heavy soot on tubes

high ambient air temperature

402

If a boiler is smoking black and increasing the boiler front air box pressure does not reduce the smoke, the cause can be .

forced draft fan failure

heavy soot on tubes

low fuel oil temperature

high air heater temperature

403

If a boiler superheater safety valve is leaking at normal working pressure, the quickest method of determining and possibly solving the problem is to .

blow out the valve by several short lifts with the hand lifting gear

fully open the superheater safety drain valve for several seconds

lower the firing rate until the leakage stops

raise the firing rate until the leakage stops

404

If a boiler tube bank baffle carries away, or burns through, there will be .

incomplete combustion

localized overheating of the water drum

excessive gas turbulence in the furnace

fireside burning of boiler tubes

405

If a burner were inserted too far into the boiler furnace, it could cause carbon deposits on the .

furnace opening

burner tip

air cone

register doors

406

If a centrifugal main feed pump were operated at shutoff head with the recirculating line closed, which of the following conditions could occur?

A decreased water level in the DC heater.

An increased water level in the steam drum.

Flashing at the suction side of the pump.

Excessive diaphragm seal wear in the feed water regulator.

407

If a feed pump failure causes the boiler water to drop out of sight in the gage glass, the engineer should FIRST .

secure the fires, steam stops and then add water

secure the fires, reduce steam load and start standby feed pump

reduce the steaming rate and then cool the boiler with the force draft fan

reduce the steaming rate and then add water

408

If a large number of tubes fail in a steaming boiler, the .

steam pressure will rise rapidly

fires will always be extinguished

water level will drop rapidly

fires will hiss and sputter

409

If a large number of tubes has failed, you can minimize damage to a boiler by .

securing the fires, steam stops, and relieving boiler pressure

securing the fires, feed stops, and leaving the boiler cut on the line

increasing the feed water supply to keep the boiler cool

speeding up the forced draft fans to blow steam up the stack

410

If a main condenser were operating with a vacuum of 28.09 in. Hg, a condensate discharge temperature of 95F, a seawater inlet temperature of 64F and an overboard temperature of 72F, which of the following would represent the condensate depression?

0.3 in. Hg

0.5 in. Hg

5.5F

3.24F

411

If a major flareback occurs to a boiler, which of the following actions should be immediately taken?

Secure the forced draft fan.

Secure the fuel to the burners.

Secure all fire room ventilation.

Purge the fuel oil system.

412

If a pressure drop does not exist across the superheater in a steaming boiler .

this is a normal condition

the drum safety valve is about to lift ahead of the superheater safety

there is no steam flow through the superheater

the feed water temperature is too low

413

If a quantity of saturated steam consists of 90 percent steam and 10 percent moisture, the quality of the mixture is .

10%

80%

90%

100%

414

If a routine boiler water test indicates high salinity, you should blow down the boiler to reduce salinity and then .

add carbonates to control sludging

treat the boiler water with phosphates

reduce the firing rate to prevent scaling

increase the firing rate to prevent foaming

415

If a salinity alarm system indicates 2.5 grains per gallon at the main condensate pump discharge, your first action should be to .

blow down the boilers and add make up water

chemically test the condensate for chloride content

increase the hydrazine dosage in the condensate line

open the main condensate recirculating valve

416

If a ship is to be laid up for an indefinite period, the saltwater side of the main condenser should be .

left filled with saltwater with the sea valves closed

left filled with saltwater with the sea valves open

drained and refilled with saltwater after closing the sea valves

drained and dried out after closing the sea valves

417

If a ship is to be laid up for an indefinite period, the steam side of the main condenser should be .

filled with moist air

left under a vacuum

completely drained of water

pressurized to approximately 5 psig with nitrogen, 99.5% pure by volume

418

If a soot blower element does not revolve freely, the most likely cause would be .

a seized blower head bearing

an improper blowing arc cam setting

warpage of the soot blower element

insufficient steam pressure to the soot blower element

419

If a steaming boiler begins 'panting,' the probable cause is .

too much air for proper combustion

excessively high furnace temperature

excessively high fuel oil temperature

insufficient air for proper combustion

420

If a steaming boiler is not supplied with sufficient air for proper combustion, the .

boiler will pant and rumble

fires will hiss and sputter

boiler will smoke white

fires will be too hot

421

If a tube failure results from low water level and the water level can not be maintained in sight in the gage glass, you should .

immediately secure the forced draft fans

increase the feed pump speed to maximum

immediately secure the fuel oil supply to the burners

blow down the gage glass to verify a low water condition

422

If a tube failure results from low water level and you cannot maintain water in sight in the gage glass, you should .

immediately secure the forced draft fans

increase the feed pump speed to maximum

immediately secure the fuel oil supply to the burners

blow down the gage glass to verify a low water condition

423

If a vessel is steaming at a steady rate, and the water level has dropped out of sight in the boiler gage glass, the FIRST corrective action should be to .

open the feed water bypass regulator

blow down the boiler gauge glass

slow down the engines

cut out the fires

424

If a water-tube boiler tube has sagged and must be plugged, a hole must be made in the tube wall to prevent .

quick burnout of that tube

pressure buildup in that tube

a complete sagging failure

tube cracking due to overheating

425

If an analysis of boiler flue gas determines there is 100% excess air for combustion, you should expect the flue gas to have a nitrogen content of approximately .

21.0%

33.0%

79.0%

87.0%

426

If an analysis of boiler flue gas determines there is 50% excess air for combustion, you should expect the nitrogen content of the flue gas to be approximately .

79.0%

33.0%

21.0%

14.0%

427

If an analysis of boiler flue gas determines there is no excess air for combustion, you should expect the nitrogen content of the flue gas to be approximately .

10.5%

14.0%

21.0%

79.0%

428

If an automatically fired burner ignites, but repeatedly goes out within two seconds, the cause could be a/an .

faulty pressure signal to the time delay relay circuit

dirty flame scanner window

burned out solenoid coil in the low fire oil valve

excessively high fuel oil temperature

429

If an oil fire occurs in the double casing of a steaming boiler, you should .

increase the forced draft fan speed

secure the feed water supply to the boiler

secure the fuel oil supply to the burners

apply water with a smooth bore nozzle

430

If an oil fire occurs in the double casing of a steaming boiler, you should .

increase the forced draft fan speed

immediately secure the feed water supply to the boiler

secure the fires and air supply and activate the steam smothering system

apply water with a smooth bore nozzle

431

If boiler priming occurs, you should immediately .

increase the steaming rate

reduce speed and open throttle drains

lift the safety valves with the hand easing gear

open the boiler bottom blow valve

432

If boiler water chemicals are decreasing in one boiler and increasing in the other boiler, while both are steaming at normal rates, a leak probably exists in the .

economizer tubes

superheater tubes

feed water crossover line

internal desuperheater flange

433

If it becomes necessary to remove water from a pressurized main boiler, it should be directed .

into the bilges

overboard through the bottom blow line

into the cofferdam

into the reserve feed tank

434

If it is necessary to operate a turbine driven main feed pump at shut off head, or at less than 20% of its rated capacity, what will prevent the pump from overheating?

Throttling of the steam supply valve.

Throttling of the liquid discharge valve.

A bypass or recirculating line led back to the pump impeller eye or suction.

A bypass or recirculating line led back to the source of suction supply.

435

If live steam is supplied directly to the tank heating coils, the collected drains in the 'clean' section of the contaminated drain inspection tank are removed directly to the .

main and/or auxiliary condenser

atmospheric drain tank

deaerating feed water heater

makeup feed water tank

436

If manual control of the water level in a steaming boiler is required, the proper method of control is with the auxiliary feed .

stop-check valve

stop valve

pump speed control

pump pressure control

437

If oil is found in the main fuel oil heater steam drain system, which of the actions listed should be taken first?

Change over fuel supply to diesel fuel.

Shift over to the standby heater and monitor contaminated drain tank for additional traces of oil.

Bottom blow the boiler using the continuous blow line.

Shift over to the low fuel oil suction on the day tank.

438

If oil is observed in the steam drains from a fuel oil heater, you should .

increase the fuel oil pressure to the heater

shift the drains to the atmospheric drain tank

transfer operation to another heater and secure the original heater

increase the steam pressure to that heater

439

If one burner of a group of operating steam atomizing burners in a steaming boiler is cut out, the register doors for that burner should be .

left wide open

left cracked open

closed halfway

closed tightly

440

If one fuel oil strainer of a duplex unit becomes clogged while the vessel is steaming at sea, the FIRST action should be to .

clean the dirty strainer as quickly as possible

change the oil flow over to the clean side

stop the fuel oil service pump

open the strainer bypass valve

441

If one fuel strainer of a duplex strainer unit becomes clogged while your vessel is underway, you should first .

secure the engine immediately

change the oil flow over to the clean side

stop the fuel oil pump

open the strainer bypass valve

442

If the bellows in a thermo-hydraulic feed water control valve ruptures, the boiler water level will .

decrease only

increase only

decrease initially and then increase

increase initially and then decrease

443

If the bellows in a thermo-hydraulic feed water control valve ruptures, the boiler water level will .

increase only

decrease only

increase initially and then decrease

decrease initially and then increase

444

If the boiler fires are extinguished by water contamination in the fuel oil, you should FIRST .

secure the burner valves

secure the settler tank suctions

reduce the load on the boiler

purge the boiler furnace

445

If the boiler water and condenser hot well levels are normal, but the DC heater level is only 30% of full, you should .

increase the speed of the condensate pump

open the feed pump recirculating valve wide

open the makeup feed

bypass the vent condenser and third- stage feed heater

446

If the boiler water level is normal, the main condenser hot well level is normal, and the DC heater level is 40% full, you should .

prime the condensate pump

bypass the vent condenser

slow the main unit

open the makeup feed vacuum drag line

447

If the condensate level in the loop seal of the air ejector intercondenser is lost, .

no condensate will flow through the system

air will be drawn back into the main condenser

the air ejector will not transfer heat to the condensate

the air ejector will overheat

448

If the condensate level in the loop seal of the intercondenser is lost, .

no condensate will flow through the system

some air will be drawn into the main condenser

the air ejector will not operate

the air ejector will become overheated

449

If the control air pressure for an automatic combustion control system is lost during maneuvering, you should immediately .

switch to manual control

blow down the air receiver

attempt to restart the air compressor

secure the boilers

450

If the cooling water flow through the air ejector intercondensers and aftercondensers is inadequate, which of the problems listed will occur?

Air ejector nozzles will erode.

Aftercondenser will be flooded.

DC heater level will rise

Main condenser absolute pressure will increase.

451

If the DC heater relief valve lifts frequently, the cause can be excessive .

condensate supplied to the DC heater

auxiliary exhaust steam pressure

feed water recirculated from the feed pump

makeup feed introduced to the system

452

If the drain regulator used in the operation of the combined L.P. feed water heater, shown in the illustration, is incorrectly set to maintain too high of a level (condensate level covers approximately the lower half of tubes in the first stage heater) the resulting operation will .

cause no adverse operating effect

cause the feed water outlet temperature to decrease

cause the feed water temperature to increase above the designed outlet temperature

cause the automatic make-up feed valve to cycle open

453

If the engineer on watch has reason to doubt the accuracy of the water level shown in the boiler gage glass, he should .

speed up the main feed pump

open the auxiliary feed line

blow down the gage glass

start the standby feed pump

454

If the entire pneumatic control to a multi-element feed water regulator fails, the feed water valve is controlled by .

constant pump pressure regulator

remote manual control regulator

single-element feed water regulator

local manual control

455

If the feed water flow sensor of a multi-element feed water regulator fails, the valve will be controlled as a .

single element feed water regulator

double element feed water regulator

triple element feed water regulator

local manual control device

456

If the fires in a boiler furnace begin sputtering or hissing, you should suspect .

excessive fuel pressure at the burners

loss of fuel pump suction

low fuel oil temperature

water contamination of the fuel oil

457

If the fires in both boilers start to sputter, you should immediately .

shift feed suction to the double bottom

speed up the fuel oil pump

shift settlers

shift to the low suction

458

If the fires start sputtering while steaming under steady conditions, which of the actions listed should be taken?

Start the standby fuel oil service pump.

Increase the fuel oil pressure.

Shift over to another fuel strainer.

Shift suction to another settling tank.

459

If the fires to a steaming boiler have been accidently extinguished, you should not relight any burner until .

all burning embers in the furnace are extinguished

the furnace refractory has cooled below ignition temperature

the boiler furnace has been thoroughly purged

all fuel has been recirculated from the burners

460

If the flue gas oxygen content is too high, you should .

adjust the combustion control system

adjust the fuel oil service system

increase the forced draft fan speed

increase the fuel oil temperature

461

If the fuel oil temperature flowing to the burners is too low, the .

fuel service pump will lose suction

boiler will produce heavy black smoke

boiler will produce dense white smoke

fuel service strainers will become clogged

462

If the fuel oil temperature in the fuel oil heater attains an excessive temperature, what will happen?

Carbon deposits will build up on the heating surfaces.

The fuel heater relief valve will open immediately.

The fuel oil pump will lose suction.

The fuel oil recirculating valve will automatically close.

463

If the gage glass water level remains constant in a steaming boiler while maneuvering, the most probable cause is a .

broken feed water regulator

restricted gage glass line

properly operating feed pump

high water level

464

If the low water level alarm sounds on an automatically fired boiler, and the low water cutout fails to function, you must immediately .

blow down the gage glass to determine where the water level is

increase the feed water supply to maintain the water level

start the emergency feed water injector to restore the normal water level

secure the fires to minimize damage to the boiler tubes

465

If the main condenser were operating at a vacuum of 28.5"Hg, a condensate discharge temperature of 86F, a seawater inlet temperature of 72F, and a seawater outlet temperature of 79F, what would be the condensate depression?

0.2 inches Hg

0.7 inches Hg

4 degrees Fahrenheit

7 degrees Fahrenheit

466

If the main condenser were operating at a vacuum of 28.7"Hg, a condensate discharge temperature of 81F, a seawater inlet temperature of 72F, and a seawater outlet temperature of 79F, what would be the condensate depression?

0.2 inches Hg

0.3 inches Hg

4.0 degrees Fahrenheit

12 degrees Fahrenheit

467

If the maximum steam generating capacity of a boiler is increased Coast Guard Regulations (46 CFR) require that the safety valves' .

lifting pressure be increased

relieving capacity be checked

reseating pressure be increased

blow down be reduced

468

If the maximum steam generating capacity of a boiler is increased, Coast Guard Regulations (46 CFR) require that the safety valves' .

relieving capacity be checked

lifting pressure be increased

reseating pressure be increased

blow down be reduced

469

If the pressure becomes excessive in the auxiliary exhaust system of a steam propulsion plant, the excess steam will normally be dumped to the .

deaerating feed tank

vent condenser

reduced steam system

main condenser

470

If the pressure control disk in the soot blower illustrated, is moved to a higher position, the result will .

cause the soot blower to rotate faster

cause the soot blower to rotate slower

decrease the amount of steam valve travel

increase the steam pressure in the rotating blower element

471

If the salinity indicator located in the main condensate pump discharge piping causes an alarm to sound there is a danger of .

low condensate depression

low condensate temperature

salting up the boilers

contaminating the distilled tank

472

If the salinity indicator periodically registers high salinity in the main hot well, the cause may be .

leaking air ejector condenser tubes

leaking tubes in the third- stage heater

excessive water pressure in the lube oil cooler

a contaminated distilled water tank

473

If the stack temperature is higher than normal, this could indicate .

low fuel oil back pressure

too much excess air

high feed water pressure

external boiler casing leakage

474

If the steam flow input device to a two-element feed water regulator valve fails, the regulator operates as a .

constant pump pressure regulator

remote manual control regulator

single-element feed water regulator

local manual control

475

If the steam whistle shown in the illustration produces a poor, rattling tone when blown, the probable cause is a/an .

insufficient steam pressure

defective pilot valve

excessive back cover tightness

a loose back cover

476

If the temperature of the fuel oil entering an atomizer is too low, the burner will .

produce smoke white

require more fuel for atomization

produce heavy black smoke at any load condition

require more excess air for combustion

477

If the theoretical quantity of dry air required to burn one pound of fuel oil is 13.75 pounds, what is the weight of air per pound of fuel when operating a boiler at 5% excess air?

14.44 pounds

15.13 pounds

15.81 pounds

16.50 pounds

478

If the theoretical quantity of dry air required to burn one pound of fuel oil is 13.75 pounds, what weight of air will be necessary to burn one pound of fuel to operate a boiler at 10% excess air?

14.44 pounds

15.13 pounds

15.81 pounds

16.50 pounds

479

If the theoretical quantity of dry air required to burn one pound of fuel oil is 13.75 pounds, what will be the weight of the air necessary to burn one pound of fuel when operating a boiler at 15% excess air?

14.44 pounds

15.13 pounds

15.81 pounds

16.50 pounds

480

If the theoretical quantity of dry air required to burn one pound of fuel oil is 13.75 pounds, what will be the weight of the air necessary to burn one pound of fuel to operate a boiler at 20% excess air?

14.44 pounds

15.13 pounds

15.81 pounds

16.50 pounds

481

If the water level cannot be seen in the lower part of the boiler gage glass, which of the following actions must be carried out immediately?

Increase the feed water going to the boiler.

Check the DC heater water level.

Blow down the boiler.

Secure the boiler fires.

482

If the water level in a steaming boiler is dropping rapidly and cannot be kept at the normal level by standard practices, you should .

secure the fires and then secure the steam stop

secure the steam stop and then secure the fires

lowdown the gauge glass to find the true water level

speed up the feed pump to raise the water to normal

483

If the water level in one boiler of a two boiler plant rapidly falls out of sight, which of the following actions should be carried out FIRST?

Secure the fuel oil to that boiler.

Raise the feed pump pressure.

Blow down the gage glass.

Secure the steam stop to that boiler.

484

If the water level in the boiler water gage glass is not in sight, and the automatic feed water regulator is in the closed position, the .

safety valve should be lifted by hand

fires should be shut off

boiler water gage is faulty

bottom blow should be opened

485

If there is a sudden drop in the outlet temperature of an uncontrolled superheater, you should .

increase the firing rate

bypass the air heater

check for high water level in the drum

reduce the forced draft fan speed

486

If water hammer develops while opening the valve in a steam line, which of the following actions should be taken?

Shut the steam valve at once, open the drain valve until all moisture is drained, shut the drain line valve, and slowly open the steam valve again.

Continue to fully open the steam valve and partially open the drain line valve until all moisture is drained and then shut the drain line valve.

Stop opening the steam valve, open the drain line valve, resume opening the steam valve slowly, and shut the drain line valve after the steam valve is open fully.

Increase the speed of opening the steam valve to rapidly heat the line to stop the water hammer.

487

If water hammer develops while opening the valve in a steam line, which of the following actions should be taken?

Shut the steam valve at once, open the drain valves until all moisture is drained, shut the drain line valves, and slowly open the steam valve again.

Continue to fully open the steam valve as the drain line valves are opened until all moisture is drained, shut the drain line valves.

Stop opening the steam valve, open the drain line valves, resume opening the steam valve slowly, and shut the drain line valves after the steam valve is open fully.

Increase the speed of opening the steam valve to rapidly heat the line to stop the water hammer.

488

If while filling the boiler a newly installed gasket on a water- tube handhole plate weeps, you should .

coat the gasket with graphite

retighten the stud nut with an air wrench

use a double gasket

center and tighten with correct size wrench

489

If you noted a large difference in the pressures indicated by a duplex pressure gage to the fuel oil system strainer, you should .

increase the fuel pump discharge pressure

reduce the firing rate of the boilers

shift to a clean fuel oil strainer

secure the fuel oil service pump

490

Improper atomization can be caused by .

low draft air pressure

using the same size burner tips in all burners

using small sprayer plates

dirty sprayer plates

491

Improper boiler feed water deaeration could be directly linked to .

operating with excessive condensate depression

fluctuating deaerating feed tank level as a result of taking on makeup feed too rapidly

fluctuating condensate pressure due to not maintaining proper hot well level

all of the above

492

Improper fuel oil burner atomization can be generally attributed to .

low draft air pressure

using the same size burner tips in all burners

high fuel oil temperature

high fuel oil viscosity

493

Improper water washing of the water-tube boiler firesides can cause .

sulfuric acid corrosion

decreased heat transfer capabilities

erosion of tubes and drums

loss of ductility in boiler tubes

494

In a "D" type marine boiler, operating under constant load, which of the following conditions could cause the superheated steam temperature to rise above normal?

High feed water temperature

Insufficient combustion air

Low feed water temperature

DFT excessive vapor pressure

495

In a boiler automation system, if a burner fuel oil solenoid valve continually trips closed under normal steaming conditions, you should .

wedge the valve in the open position and report it to the chief engineer

bypass the solenoid valve and enter the fact in the logbook

secure the burner and determine the cause of the valve failure

wedge the valve in the open position and reduce the fuel oil pressure at that burner

496

In a boiler equipped with a convection type superheater, the superheater tubes are located .

in a position screened from the furnace flame

in the direct path of radiant heat flow

in a separately fired convection furnace

on the fireside of the screen tubes

497

In a boiler equipped with a convection type superheater, the superheater tubes are located .

in the path of the radiant heat of combustion

between the downtake nipple and circulator tube

in a position screened from the furnace

between the economizer and generating tubes

498

In a boiler equipped with an automatic feed water regulator, erratic variations in the water level could be caused by .

high solids content and foaming in the drum

ruptured feed water control valve diaphragm

low feed water temperature

high feed water temperature

499

In a boiler furnace, incomplete combustion due to insufficient air yields an excess amount of .

carbon dioxide

carbon monoxide

nitrogen oxide

sulfur dioxide

500

In a boiler water gage glass, a ball check valve is installed on the .

top connection only

bottom connection only

top and bottom connection

drain valve

501

In a boiler, water flows downward in tubes furthest from the fires and flows upward in tubes nearest the fires because .

water is denser in the tubes farthest from the fires

water is less dense in the tubes farthest from the fires

tubes farthest from the fires have a greater diameter

tubes farthest from the fires have a smaller diameter

502

In a closed feed and condensate system, to where do the main air ejector after condenser drains directly drain?

auxiliary condenser

loop seal

atmospheric drain tank

deaerating feed tank

503

In a closed feed and water cycle, which of the conditions listed could prevent vacuum from reaching the desired level?

Steam leaking from the turbine glands.

Marine growth on the cooling water side of the main condenser.

Condensate recirculating back to the condenser during maneuvering.

Steam pressure to air ejectors maintained at 10 psig above designed supply pressure.

504

In a closed feed water system, the greatest deaeration of condensate occurs in the .

DC heater

atmospheric drain tank

air ejector condenser

vent condenser

505

In a closed steam and water cycle, which of the conditions listed could prevent main condenser vacuum from reaching the desired level?

Excess steam leaking from the turbine glands.

Abnormally low atmospheric drain tank level.

Main condensate recirculating valve open during maneuvering.

Dirty boiler economizer tubes.

506

In a DC heater, which source of steam is commonly used to heat and deaerate condensate?

Root steam

Auxiliary exhaust steam

Main steam

Auxiliary steam

507

In a D-type boiler, which of the tubes listed would be located in the generating tube bank?

Water walls

Superheater support tubes

Downcomer tubes

Recirculating tubes

508

In a huddling chamber safety valve, the initial valve opening is caused by .

static pressure acting on the compression screw

steam pressure acting on the increased surface area of the projecting feather

steam flow passing through the calibrated adjusting ring

steam pressure acting on the exposed bottom area of the valve disk

509

In a huddling chamber type safety valve, initial valve opening is caused by static pressure acting on the .

valve disk

nozzle ring

adjusting ring

compression screw

510

In a main propulsion steam turbine installation, the condensate pump initially discharges to the .

air ejector condenser

deaerating feed tank

first stage heater

distillate tank

511

In a marine boiler equipped with mechanically atomized burner assemblies, proper combustion depends on the .

design and mechanical construction of the atomizers

speed of the forced draft fan and quantity of excess air

centrifugal force imparted to the oil in the atomizer

all of the above

512

In a marine boiler equipped with mechanically atomized burner assemblies, proper combustion depends on the .

fuel oil pressure

speed of the forced draft fan and quantity of excess air

temperature of the fuel oil

all of the above

513

In a marine boiler, maximum heat transfer rates can be obtained by .

maintaining the recommended boiler water pH

treating the boiler water with oxygen scavenging chemicals

maintaining feed water temperature of 212F in the economizer

keeping the watersides free from scale deposits

514

In a marine condenser designed with a reheating hot well, the hot well is reheated by .

recirculation of condensate

steam lanes in the condenser

a branch line from the air ejector steam supply

submerged heating coils supplied with auxiliary exhaust steam

515

In a modern high pressure steam plant, most feed water deaeration takes place in the .

atmospheric drain tank

air ejector condenser

DC heater

vent condenser

516

In a multi-burner firebox, a burner tip with a worn and enlarged orifice will .

have no effect on the flow of oil if the proper pressure is maintained

result in an uneven flow of oil through the burner

cause a high fuel oil return line back pressure

cause smokeless and flameless combustion

517

In a multi-burner firebox, a burner tip with a worn and enlarged orifice will .

have no effect on the flow of oil if the proper pressure is maintained

result in an uneven heating of the furnace

cause a high fuel oil return line back pressure

cause smokeless and flameless combustion

518

In a properly designed boiler, which end point is most likely to occur first?

Evaporation

Circulation

Combustion

Moisture carryover

519

In a properly designed boiler, which of the end points should be reached first?

Carryover

Circulation

Evaporation

Combustion

520

In a propulsion boiler, diesel oil is generally supplied to the burners when .

heavy smoking persists

lighting off a cold ship

a heavy fuel must be blended

it is necessary to compensate for overload capacity

521

In a regenerative air heater, air is bypassed around the heater while .

operating at low steaming rates

blowing tubes

crossing over forced draft fans

giving a surface blow

522

In a single furnace boiler, where is the steam typically cooled for use as auxiliary steam?

Superheater

Desuperheater

Condenser

Air ejector

523

In a single-element feed water regulator, the amount of valve opening and closing is controlled by the .

water level in the drum

steam pressure in the drum

steam flow from the boiler

feed water flow to the boiler

524

In a steadily steaming boiler, carryover is indicated by a/an .

inability to maintain boiler chemistry

sudden increase in superheater outlet temperature

sudden decrease in superheater outlet temperature

sudden decrease in drum level

525

In a steam assist atomizer, the fuel oil/steam mix takes place entirely within the .

tangential slots

mixing chamber

whirling chamber

fuel oil swirlers

526

In a steam assist fuel oil atomizer, the steam pressure is higher than the oil pressure at .

design boiler load

minimum boiler load

high fuel viscosity

low fuel viscosity

527

In a steam propulsion plant, the primary source of auxiliary exhaust steam is from the .

main condenser

main feed pump

distilling plant

air heaters

528

In a steaming boiler most dissolved chlorides tend to concentrate at or near the .

tube joints

feed pipe

mud drum

water surface

529

In a steaming boiler, higher than normal stack gas temperature can be caused by .

low steam demand

excessively high fuel oil temperature

too much excess air

delayed burning due to inadequate excess air

530

In a steaming boiler, most dissolved chlorides tend to concentrate at, or near, the .

tube joints

mud drum

water surface

floor tubes

531

In a water tube boiler, circulation is developed by the difference in the . I. tube length and various diameters II. densities of the hot and cold water

I only

II only

Both I and II

Neither I nor II

532

In a water tube boiler, waterwall tubes are effectively used to . I. decrease the amount of refractory material necessary in non-waterwall installations II. allow for significant increases in the combustion rates

I only

II only

Both I and II

Neither I nor II

533

In a water-tube boiler, circulation is caused by the difference in the .

area and length of the water-tubes

densities within the circulating water

heights of the boiler drum

angle of inclination of the tubes

534

In a water-tube boiler, sludge is most likely to collect in the .

generating tubes

downcomer tubes

screen tubes

floor tubes

535

In a water-tube boiler, waterside scale formation is caused by .

sodium phosphate

calcium sulfate

magnesium phosphate

sodium hydroxide

536

In accordance with Coast Guard Regulations (46 CFR Part 56), all vessels having oil fired boilers must be equipped with .

one positive- displacement type fuel service pump

Suction and discharge strainers capable of being cleaned without interrupting the oil supply

one fuel oil heater if shown that the normally used fuel oil will be of low viscosity

all of the above

537

In accordance with Coast Guard Regulations (46 CFR Part 62) for vessels propelled by steam turbines, the navigation bridge primary control system must include safety limit controls for .

high boiler water levels

low boiler water levels

low steam pressure

All of the above

538

In accordance with Coast Guard Regulations (46 CFR) all fuel oil service piping in the vicinity of the burners must .

utilize leak proof gaskets in all joints

have all joints seal welded

have wrap around deflectors on all bolted flanged joints

be provided with coamings or drip pans

539

In accordance with Coast Guard Regulations (46 CFR), all vessels having oil fired main propulsion boiler(s) must be equipped with .

at least two fuel service pumps

at least two fuel oil heaters

a suction and discharge duplex strainer

all of the above

540

In accordance with Coast Guard Regulations (46 CFR), the maximum allowable working pressure of a water-tube boiler must be stamped on the .

burner front

lower header

name plate

drum head

541

In accordance with Coast Guard Regulations (46 CFR), which of the following materials may be used in short lengths between the fuel oil boiler front header manifold and the atomizer head to provide flexibility?

Copper tubing

Annealed copper nickel

Nickel copper

All of the above

542

In accordance with Coast Guard Regulations (46 CFR), which of the following statements is true concerning safety valve construction and/or operation used on propulsion boilers?

Not have threaded inlets for valves larger than 2".

Gagging a safety valve by means of a set screw through the cap when gags are unavailable is acceptable only when conducting a hydrostatic test.

After the valve is set and adjusted, the tolerance in popping and reseating pressures shall not vary more than plus or minus 1 1/2%.

All of the above.

543

In addition to a nozzle, a fuel oil atomizer uses which of the listed parts?

Ignition electrode

Burner cone

Sprayer plate

Air cone

544

In addition to a orifice plate, a fuel oil atomizer uses which of the listed parts?

Ignition electrode

Burner cone

Sprayer plate

Air cone

545

In addition to being hazardous to personnel, gas leaks through the boiler casing can also .

cause overheating of the uptakes

impair the effectiveness of the air purge cycle

cause improper atomization of fuel oil

impair the operation of the high steam pressure limit switch

546

In addition to monitoring flame quality, flame scanners are used in combustion control systems to .

regulate the air/fuel ratio controller for more efficient combustion

secure the forced draft fans upon flame failure

automatically open the fuel oil solenoid valves

secure the fuel supply in the event of a flame failure

547

In addition to the repeated use of surface blow to control boiler water chemistry, caustic soda may be used to treat high salinity, as well as .

calcium chromate, for oxygen control

phosphate, to aid in scale prevention

calcium carbonate, to assist in precipitating solids

calcium sulfate to reduce priming

548

In an air register assembly, the majority of air passes through the .

diffuser or impeller

atomizer assembly

stationary air foil or blade cone

distance piece

549

In an automatically fired boiler, increasing the temperature of the feed water entering the steam drum will ultimately result in a/an .

increase in the quality of superheated steam

increase in fuel consumption

decrease in the degree of superheat

decrease in the quality of steam entering the superheater

550

In an automatically fired boiler, the steam pressure regulator controls the supply of fuel oil to the burners by responding to variations in the .

steam drum water level

steam header pressure

master fuel oil solenoid valve position

burner flame intensity

551

In an oil fired water-tube boiler, inner casing air leaks can cause .

oxidation of the exposed furnace walls

chilling of the combustion gases

excessive feed water consumption

localized overheating of tube surfaces

552

In automated boiler operations, a dirty flame scanner will most likely result in .

increased fuel oil consumption

securing fuel oil to the burner

loss of forced draft air

incomplete purge cycle

553

In automatic combustion control systems, increasing or decreasing a loading pressure by a set amount is called .

biasing

loading

relaying

transmitting

554

In most installations, the firing rate of a boiler using steam atomization is indicated by the .

burner register opening

fuel oil supply pressure

fuel oil return pressure

steam atomization temperature

555

In most marine boilers, the primary reason the first few rows of generating tubes, called screen or furnace row tubes, are made larger in diameter than the rest of the generating tubes is because .

they require more water flow since they are exposed to the greatest heat

they must screen the superheater from the direct radiant heat of the burners

they must act as downcomers to ensure proper circulation

their main function is to retard combustion gas flow for maximum heat transfer rates

556

In order for a maximum number of boiler generating and circulating tubes to be installed without weakening the tube sheet, which of the listed procedures should be carried out?

All rows of tubes should be bent at the same angle.

All rows of tubes should be installed horizontal to the drum.

Different rows of tubes should be bent to enter the drum at any convenient angle.

All tubes should be installed normal to the drum surfaces.

557

In order to test the lifting pressure of the deaerating feed heater relief valve, you would . I. close the auxiliary exhaust dump valve to the main and auxiliary condensers II. increase the set point of the make-up steam regulator to the auxiliary exhaust system

I only

II only

Both I and II

Neither I nor II

558

In order to test the lifting pressure of the deaerating feed heater relief valve, you would . I. close the auxiliary exhaust dump valves to the main and auxiliary condenser II. increase the set point of the reduced steam pressure to the auxiliary exhaust system

I only

II only

Both I and II

Neither I nor II

559

In order to test the lifting pressure of the deaerating feed heater relief valve, you would . I. place a gag on the relief valve II. increase the set point of the reduced steam pressure to the auxiliary steam system

I only

II only

Both I and II

Neither I nor II

560

In preparing to blow tubes at sea, you should .

increase the firing rate

decrease the firing rate

increase the forced draft speed

decrease the forced draft speed

561

In the absence of the manufacturer's instructions, a good procedure in reassembling a high pressure boiler gage glass is to tighten the nuts in pairs and .

begin with the center bolts and work toward the ends

begin with the end bolts and work toward the center

start at the top and work down

start at the bottom and work up

562

In the boiler shown in the illustration, the arrow "C" indicates a .

downtake nipple

water wall header

sliding foot

recirculating header

563

In the boiler shown in the illustration, the arrow "E" indicates a .

water wall tube

recirculating tube

support tube

downcomer

564

In the boiler steam and water system, pressure is highest in the .

steam stop

dry pipe

feed line

mud drum

565

In the condensate system, the automatic recirculating valve can be actuated by the .

DC heater water level

superheater steam flow

condensate temperature

condensate pump discharge pressure

566

In the event of a failure of the pneumatic control system, a multi-element feed water regulator is designed to operate as a .

constant-pressure regulator

constant-volume feed water regulator

manually controlled feed water regulator

thermo-hydraulic feed water regulator

567

In the majority of marine power plants, the fuel oil heater installations are divided into several units because .

more heating is required for lower loads

auxiliary steam is better utilized in this system

plant operation can be continued while repairs are being made to a defective unit

oil leakage into the condensate system is less likely with multiple system

568

In the prevention of moisture carryover from a marine boiler, one important consideration is to .

properly treat the boiler water with hydrazine

control the amount of boiler water solids

maintain a high boiler water level

add foaming agents to the boiler water

569

In the system illustrated the valves at point "A" are .

swing check/ stop valves

stop-check/ stop valves

gauge valves/ drain valves

globe valves/ gate valves

570

In what section of a boiler would you find a steam quality of 90%?

Superheater outlet

Desuperheater outlet

Steam drum

Last pass of the superheater

571

In which of the following types of condensers would you find the cooling water passing through tubes with the turbo generator exhaust steam directed around the outside of the tubes?

Jet

Barometric

Surface

Collins

572

In which of the listed components is chemical energy converted to thermal energy with regards to boiler operation?

Furnace

Superheater

Steam drum

Economizer

573

In which order should the chemical test analysis of boiler flue gas samples be made?

CO2, O2, CO

CO, CO2, O2

O2, CO, CO2

CO, O2, CO2

574

Increasing the amount of excess air to a boiler equipped with an uncontrolled interdeck superheater will cause the steam temperature at the superheater outlet to .

decrease

increase

decrease momentarily

increase momentarily

575

Increasing the blow down of a boiler nozzle reaction safety valve is normally accomplished by .

increasing the valve spring compression

decreasing the valve spring compression

raising the adjusting ring

lowering the adjusting ring

576

Increasing the temperature of the feed water entering the steam drum will ultimately result in a/an .

increase in stack gas temperature

increase in fuel consumption

decrease in the degree of superheat

decrease in the quality of steam entering the superheater

577

Insufficient air for combustion in a boiler furnace could result in a .

white incandescent flame

high flame temperature

black stack smoke emission

0% carbon monoxide level

578

Insufficient combustion air supply to a boiler furnace can cause .

low superheater temperature

high stack temperature

high superheater temperature

sputtering fires

579

Insufficient combustion air supply to the furnace would cause .

the fires to sputter

low superheater outlet temperature

high stack temperature

high feed water consumption

580

Insufficient combustion air supply will cause an atomizer flame to appear as a .

ragged flame

pointed flame

dull red flame with black streaks

light yellow flame with white streaks

581

Insufficient cooling water circulation through air ejector intercondensers and aftercondensers will cause .

decreased vacuum in the main condenser

overheating of the air ejector nozzles

flooding of the aftercondenser

flooding of the loop seal

582

Leakage into an internal desuperheater may be caused by .

steam scrubbers carrying away

external corrosion penetrating the desuperheater tube walls

chemical feed pipe leaking

excess lifting of safety valves

583

Longitudinal expansion of a boiler water drum is allowed for at the boiler .

tube sheet

casing joints

foundation sliding feet

refractory expansion joint

584

Longitudinal expansion of a boiler water drum is permitted by the .

tubes

casing

foundation

refractory

585

Low stack gas temperature should be avoided to reduce .

economizer thermal stress

sulfuric acid formation

back pressure in the uptakes

air heater thermal stress

586

Low stack gas temperatures due to light boiler loads should be avoided in order to reduce the .

percentage of carbon monoxide in the stack gas

formation of dew point sulfuric acid

heat loss through the uptakes

accumulation of soot

587

Low steam pressure in a steaming boiler can be caused by .

low steam demand

high feed water temperature

low water level

large sprayer plates

588

Lower boiler efficiency results from carrying too much excess air because .

it varies the degree of deposits on heat absorbing surfaces

it increases the volume and temperature of the furnace gas leaving the stack

it decreases the volatility of the fuel

the flame temperatures are lower

589

Lower than normal steam pressure in an operating boiler may be caused by .

a sudden drop in superheater outlet temperature

high feed water temperature

a low water level in the steam drum

boiler water contamination

590

Machinery operating features are designed to help conserve energy. Which of the following will not contribute to a system's thermal efficiency?

Reduction of friction.

Insulation of hot surfaces.

Lubrication of moving parts.

Elevation of heat sink temperatures.

591

Main condensate recirculating systems are primarily intended to .

prevent excessive overheating of the condensate pumps

balance and control condensate temperatures at full load

provide adequate cooling water for the air ejector condensers

vent accumulated vapors from the condensate pump discharge

592

Main propulsion steam turbine casing drains generally discharge to the .

contaminated drain tank

main condenser

bilge

atmospheric drain tank

593

Main steam turbine lubricating oil systems are fitted with .

floating strainers

magnetic strainers

centrifugal strainers

cestus strainers

594

Maintaining low pressure in a condensing turbine exhaust trunk .

enables better utilization of available heat energy to perform work

eliminates creep problems in the exhaust trunk during maneuvering

reduces condensate depression with low seawater temperature

prevents steam turbulence in the exhaust trunk due to steam laning

595

Makeup feed water is brought into an operating closed feed system via the .

main feed pump

auxiliary feed pump

feed booster pump

condenser vacuum drag line

596

Many steam plants are designed so that diesel oil can be provided to the burners when .

heavy smoking persists

lighting off a cold ship

a heavy fuel must be blended

overload capacity is required

597

Maximum heat transfer rates in a marine boiler can be obtained by .

maintaining the recommended boiler water pH

treating the boiler water with oxygen scavenging chemicals

maintaining the feed water temperature of 212F

keeping the watersides free from scale deposits

598

Modern day boiler automation allows bypassing the "flame safeguard" system to permit a burner to have a "trial for ignition" period during burner light-off. This period may not exceed .

5 seconds

10 seconds

15 seconds

30 seconds

599

Modern fuel oil temperature control devices are regulated to obtain a desired viscosity rather than a specific fuel oil temperature because .

residual fuel oils have the same viscosity characteristics regardless of where they are refined

the temperature of the fuel oil varies with the flow rate through the heater

the relationship between temperature and viscosity varies with different fuels

viscosity regulation eliminates the need for close control of the fuel/air ratio

600

Most marine boilers are designed to produce .

superheated steam only

saturated and superheated steam

saturated steam only

superheated and supercritical steam

601

Natural circulation in a marine boiler is a result of .

the difference in the densities of the fluid in the downcomer and riser circuits

the fact that the specific weight of steam is greater than water

the velocity imparted to the feed water by the feed pump

the turbulence of high pressure feed water entering the steam drum

602

Nichrome wire is used when patching boiler furnaces for .

anchoring plastic refractory only

reinforcing castable and plastic refractory

anchoring castable refractory only

anchoring castable and plastic refractory

603

Noise caused by condensate striking bends or fittings in a steam pipe line is called .

condensate depression

water hammer

piston slap

hydraulic lock

604

Normally a boiler water sample should be taken .

after the boiler has been blown down

before the boiler has been blown down or chemicals added

when the boiler has been refilled with makeup

from the highest point in the feed system

605

Oil accumulation in boiler water would .

cause foaming and carryover from the boiler

increase the heat transfer rate

prevent acid attack on the boiler tubes

practically eliminate boiler sludge formation

606

Oil in the contaminated drain inspection tank results from .

a defective relief valve on the fuel oil heater

improper drainage of the fuel oil heater coils

a leaking heating coil in a fuel oil settling tank

operating the fuel oil heater at excessive temperatures

607

Oil or scale deposits on boiler tube walls will cause .

those tubes to overheat

decreased boiler steam pressure

increased boiler steam pressure

an explosion in the boiler

608

On a boiler equipped with an uncontrolled interdeck superheater, reducing the feed water temperature to the steam drum will cause the superheater outlet temperature to .

rise

decrease

rise momentarily then decrease

remain constant

609

On a boiler equipped with pilot actuated safety valves, which of the valves listed will be actuated first?

Drum safety valve

Superheater safety valve

Pilot actuated safety valve for the superheater safety valve

Pilot actuated safety valve for the drum safety valve

610

On a boiler safety valve, the blow down adjusting ring is locked in place by a .

set screw

locknut

wire seal

cotter pin

611

On an automatically fired boiler, the loss of forced draft fan will result in which of the listed actions to be carried out?

Stopping of the feed pump

Stopping of the fuel oil service pump

Closing of the master fuel oil cutoff

All of the above.

612

On an operating boiler, the superheater safety valve shown in the illustration is set to lift at 670 psi and reseat at 630 psi. To increase the lifting pressure to 700 psi, but maintain the previous reseat pressure, you would turn the compression screw .

in the clockwise direction only

in the counterclockwise direction only

clockwise direction and lower adjusting ring

counterclockwise direction and raise the adjusting ring

613

Once a huddling chamber type safety valve has begun to initially open, it will then pop open due to the . I. expansion of the steam leaving the nozzle II. forces exerted on the projecting lips

I only

II only

Both I and II

Neither I nor II

614

One advantage of installing water wall tubes in a boiler furnace is to .

increase furnace size

reduce furnace temperature

decrease refractory maintenance

reduce combustion rates

615

One boiler of a two boiler plant has ruptured a tube and the water cannot be maintained in sight in the gage glass. After securing the fires, your next action should be to .

secure the forced draft fans

stop the fuel oil service pump

secure the feed water supply to the boiler

close the main steam stop

616

One factor for determining the minimum feed water inlet temperature to a boiler economizer is the .

dew point temperature of the stack gases

superheater inlet temperature

temperature of steam bled off the LP turbine

desuperheater outlet temperature

617

One function of a steam drum desuperheater installed in a high pressure boiler would be to .

maintain the essential flow of feed water into the drum

raise the boiler water temperature in the steam drum

lower the temperature of the steam entering the superheater

lower the temperature of the steam in the steam drum

618

One function of the air and flue gas bypass dampers installed in regenerative type air heaters is to .

avoid excessive cooling of the stack gases during low load operation

regulate combustion air temperature at normal firing rates

reduce the load on the element drive motor

reduce the temperature of the double undulated heating elements

619

One function of the component labeled "C" shown in the illustration is to .

act as a foundation beam to support the weight of the boiler

provide a collecting area for sediment and sludge

cool the refractory

form a soot seal in the lower corner of the boiler casing

620

One function of the desuperheater installed in a boiler steam drum is to .

raise the temperature of the steam in the dry pipe

distribute feed water within the boiler

provide steam for auxiliary machinery

add moisture to superheated steam

621

One function of the internal fitting labeled "C" shown in the illustration is to .

reduce high water level in an emergency

pass generated steam to the superheater

remove scum from the water surface

distribute feed water throughout the drum

622

One of the basic rules applying to the operation of a single- pass main condenser, is that the .

cooling water overboard should be about 10F higher than the inlet temperature

vacuum must be maintained at 29.92" of Hg. under all operating conditions

quantity of reheating steam flow through the condenser must be maintained at maximum under all operating conditions

condensate temperature must never be allowed to drop below 104F

623

One of the functions of a boiler desuperheater installed in a high pressure boiler is to . I. maintain the essential flow of feed water into the drum II. heat the boiler water in the steam drum

I only

II only

Both I and II

Neither I nor II

624

One of the important functions of the superheater safety valves is to .

maintain a constant steam flow in the desuperheater

protect the desuperheater from overheating

protect the superheater from overheating

maintain a constant steam flow in the auxiliary steam line

625

One of the operating conditions sensed by a two-element feed water regulator is .

feed water flow

steam flow

fuel pressure

steam pressure

626

One of the purposes of chemically treating boiler water is to .

reduce blow down frequency

reduce scale formation

eliminate waterside cleaning

constantly decrease alkalinity

627

One purpose of a desuperheater installed in a boiler steam drum is to .

protect the superheater from overheating

increase the boiler efficiency

add moisture to superheated steam

remove all superheat from generated steam

628

Overheating of the generating tubes will occur when a boiler reaches its end point of .

evaporation

circulation

combustion

moisture carryover

629

Panting in an oil fired marine boiler can be caused by .

excessive combustion air supply

low fuel oil temperature

fouled burner sprayer plates

insufficient combustion air supply

630

Panting or rumbling in a boiler furnace is usually caused by .

too much air

not enough air

low fuel temperature

low fuel pressure

631

Phenolphthalein indicator is used in the boiler water test for .

dissolved oxygen

alkalinity

chloride content

hardness

632

Phenolphthalein is used as an indicator to test boiler water for .

hardness

alkalinity

hydrazine

chloride content

633

Phosphates are used in the chemical treatment of boiler water to .

control alkalinity and neutralize vanadium

convert scale forming salts to relatively harmless sludges

neutralize the harmful effects of hydrogen embrittlement

decrease dissolved oxygen content

634

Poor atomization accompanied by an elongated flame from a steam atomization burner is MOST likely caused by .

the fuel oil temperature being too low

improper operation of traps in atomizing steam return piping

the forced draft fan too slow for the boiler load

an improper cetane number

635

Prior to lighting a burner in a cold boiler, you should .

close the superheater vent

blow down the mud drum

open the surface blow valve

thoroughly purge the furnace

636

Proper bracing and support of the boiler safety valve escape piping is necessary to .

prevent condensate from accumulating in lines

prevent stressing of the safety valves

allow for back pressure formation in the line

prevent scale from lodging on the valve seat

637

Proper lagging of a single-element feed water regulator is accomplished by applying the insulation material .

to the steam connection, but not water connection

to the water connection, but not steam connection

to both connections, including finned areas

only as necessary to prevent possible injury

638

Proper use of the boiler surface blow will .

remove most precipitated solids

remove floating impurities from boiler water

disrupt circulation in a steaming boiler

have no effect on boiler alkalinity

639

Proper vacuum must be maintained in the main condenser to .

run auxiliary machinery

maintain plant efficiency

utilize circulating seawater

cool the lube oil supply

640

Pulsating boiler furnace fires can be caused by .

low fuel temperature

too much air

low fuel pressure

too little air

641

Pumps normally used for fuel oil service are .

positive displacement rotary pumps

two-stage centrifugal pumps

explosion proof gear pumps

non-vented plunger pumps

642

Radial cracks have developed in the castable refractory of the burner cones after the first firing since the installation of new furnace front refractory. This is an indication of .

a need for plastic firebrick patchwork

inadequate cone angle

a need for castable refractory patchwork

relieved stresses

643

Rapid fluctuation in the superheater temperature of a steady steaming boiler indicates .

moisture carryover

improper positioning of superheater fires

leaky desuperheater tubes

leaky superheater tubes

644

Rapid fluctuation of the superheater outlet temperature can be caused by .

a dirty economizer

intermittent water carryover

excess air

dirty watersides

645

Rapidly discharging condensate into the DC heater during normal steaming conditions could cause .

decrease in auxiliary exhaust pressure

decrease in dissolved oxygen in the feed water

water hammer in the economizer

increase in auxiliary exhaust pressure

646

Reaching which 'end point' will result in the most severe damage to the boiler?

Circulation

Carryover

Combustion

Atomization

647

Reaching which of the boiler end points listed could cause the most damage to a boiler?

Combustion

Moisture carryover

Circulation

Heat transfer

648

Recirculation of the feed water ensures a flow of water through the .

main feed pump

economizer

standby feed pump suction line

third stage heater

649

Regarding the boiler shown in the illustration, the burners are to be placed at .

arrow "F"

arrow "K"

arrow "L"

none of the above

650

Relief valves in the fuel oil service system discharge to either the service pump suction or the .

settling tanks

recirculating line

simplex fuel oil strainer

slop retention tank

651

Remote water level indicators, operate on the principle of .

different refractive properties of steam and water

increased feed rates at higher steam demand

different chemical properties of steam and water

different pressures which result from the comparison of the varying water level in the drum with that of a constant head

652

Results of the flue gas analysis indicate a high percentage of carbon dioxide and a low percentage of carbon monoxide, approaching maximum efficiency. This condition coincides with which area(s) on the graph shown in the illustration?

A

D

B and C

E

653

Results of the flue gas analysis indicate a high percentage of carbon monoxide and an extremely low percentage of carbon dioxide. This condition coincides with which area on the graph shown in the illustration?

A

B and C

D

E

654

Routine maintenance of boiler sliding feet should include .

wire brushing to remove scale, rust, and dirt

torquing retaining bolts on the stationary base

removing all grease from around the bolts

painting the sliding surfaces to prevent corrosion

655

Routine maintenance of boiler sliding feet should include .

painting the sliding surfaces to prevent corrosion

removing all grease from around bolts

torquing retaining bolts on the stationary base

wire brushing to remove scale, rust, and dirt

656

Rows of tubes installed along the walls, floor, and roof of the furnace are called .

screen tubes

downcomers

water walls

water headers

657

Safety valve gags should only be installed hand tight in order to prevent .

compression of the valve spring

bending of the valve stem

damage to the gag

over pressurizing the valve body

658

Safety valves should be set to lift at or below the maximum working pressure allowed by the .

Marine Power Plant Guide

Marine Engineering Regulations

Certificate of Inspection

Marine Engineer's Manual

659

Saltwater contamination of condensate could occur at which component?

DC heater

Aftercondenser

Fresh water evaporator

Intercondenser

660

Scale formation on the waterside of boiler tubes is generally produced by .

the salts of calcium and magnesium

metal oxides in the waterside

dissolved oxygen in the waterside

accumulations of phosphates in the feed water

661

Scale in the air ejector first-stage nozzle could cause a decrease in the .

air ejector steam supply pressure

low pressure turbine exhaust temperature

condensing temperature in the condenser

condenser vacuum

662

Scale prevention in boiler water is accomplished by adding treatment chemicals to .

precipitate scale forming salts into sludge

solidify the scale as powder

increase boiler water acidity

cause the water to be neutral

663

Scavenging air is supplied to steam soot blower elements to .

prevent back up of combustion gases into soot blower heads

provide cooling air when soot blower elements are rotating through blowing arcs

prevent build up of soot on the element

prevent overheating of adjacent tubing

664

Scavenging air is supplied to steam soot blower elements to .

provide cooling air when soot blower elements are rotating through blowing arcs

prevent buildup of soot on the element

prevent overheating of adjacent tubing

prevent the backup of combustion gases into soot blower heads

665

Scavenging air is supplied to steam soot blowers to .

prevent the backup of combustion gases into soot blower heads

provide cooling air when soot blower elements are rotating through blowing arcs

prevent the escape of steam into the inner casing

prevent warping of the cams when exposed to high temperature steam

666

Scavenging air lines are connected to boiler stack periscopes to .

keep the periscope tubing from warping

keep the mirrors from misaligning

maintain a negative pressure in the periscope line

prevent stack gases from contaminating the periscopes internal components

667

Scavenging air pressure is provided to the steam soot blowers to . I. keep steam from accumulating in the soot blowing element while another element is being operated II. prevent corrosive combustion gases from entering the elements when the system is secured

I only

II only

Both I and II

Neither I nor II

668

Sediment in fuel oil will cause .

sputtering of atomizers

panting in the furnace

excessive white smoke

clogged atomizer tips

669

Sediment in fuel oil will cause .

wear in the fuel oil pumps

clogging of the fuel oil heaters

wear in the sprayer plates

all of the above

670

Serious tube leaks in the air ejector after condenser assembly may cause .

clogged steam strainers

fouled nozzles

an overflow of the contaminated drain inspection tank

an overflow of the atmospheric drain tank

671

Serious tube leaks in the air ejector condenser assembly may cause .

clogged steam strainers

high salinity content

an overflow of the contaminated drain inspection tank

an overflow of the atmospheric drain tank

672

Serious tube leaks in the air ejector condenser assembly will cause .

clogged steam strainers

fouled nozzles

loss of vacuum

faulty steam pressure

673

Severe priming in a boiler can cause damage to the .

superheater

steam drum internals

feed water regulating valve

control desuperheater

674

Shortly after shutting off the fuel to a boiler which is to be secured, the .

air cock should be opened

superheater vent may be closed

burner registers should be closed

feed stop must be closed

675

Should one boiler on a two boiler vessel suffer serious tube damage, the Officer-in-Charge, Marine Inspection may issue a permit (Form CG-948) to proceed to another port for repair .

only if the vessel's Certificate of Inspection is valid and has not expired

as long as no cargo or passengers are being carried

only upon written application of the master, owner, or agent of the vessel

all of the above

676

Should the superheater outlet thermometer indicate an excessively high temperature on a single furnace boiler, the cause could be .

dirty steam generating tube surfaces

too much excess air

the fuel oil being too viscous

all of the above

677

Single-element automatic feed water regulators are controlled by the .

temperature in the steam drum

water level in the steam drum

pressure in the steam drum

feed water flow to steam drum

678

Slag buildup on boiler furnace refractory is undesirable because it causes .

peeling or spalling of the brickwork

excessive cooling of the brickwork

shrinking of the brickwork

fracturing of the anchor bolts

679

Slag caused by water in the fuel oil will .

form a protective coating thus increasing its life

seal refractory joints thereby improving its function

expand at a different rate and result in damaged refractory

increase the furnace efficiency because of reduced firebox turbulence

680

Slagging of boiler furnaces is a slow progressive action which is accelerated by .

fuel oils having high ash content

low firing rates

prolonged feed water contamination of fuel oil

burning diesel fuel

681

Sodium sulfite is added to boiler water to chemically react with any .

dissolved oxygen present in the water

dissolved carbon dioxide present in the water

potassium phosphate present in the water

phenolphthalein present in the water

682

Sound is produced by the illustrated device by the .

vertical vibrating movement of "E"

high speed rotation of "B"

rapid oscillation of "B"

rapid input of steam or air through "F"

683

Spray attemperators are commonly used to .

deaerate condensate

reduce steam temperatures

cool the intercondenser

aerate makeup distillate

684

Stack type air heaters are bypassed when a vessel is in port in order to prevent .

insufficient air supply to the fires due to the pressure drop across the heater

interference with the operation of the soot blowers

corrosion of the heater due to the low stack temperatures

localized heat stressing of air heater surfaces

685

Steam assist fuel atomizers are converted to straight mechanical atomizers in order to .

raise steam on the idle boiler

cold start a boiler with diesel oil

meet minimum boiler steam demands

provide the best fuel economy

686

Steam baffles are installed in the steam drum of a water- tube boiler to .

direct the flow of steam to the desuperheater inlet

reduce the possibilities of carryover

prevent water return

increase the velocity of the steam and water mixture

687

Steam baffles are used in the steam drum of a water-tube boiler to .

support the drum safety valve nozzles

reduce the possibility of carryover

extend the internal feed pipe

remove boiler water dirt deposits

688

Steam condensed in the air ejector intercondenser, drains to the .

atmospheric drain tank

aftercondenser drain tank

vent condenser drain tank

main condenser through the loop seal

689

Steam drains from fuel oil heating coils can be returned to the condensate and feed water system .

through a direct connection to the heating drain header

through a vacuum drag line connection to the fuel heater

after being collected in the drain inspection tank

after first passing through the DC heater

690

Steam drains from the potable water system hot water heater would be collected in the .

deaerating feed water heater

contaminated drain inspection tank

gland exhaust condenser

first stage heater

691

Steam drum water level indicators must be calibrated to compensate for density differences between the indicated drum water level, and the actual drum water level. If no compensation is made, the indicator will show a .

lower level than exists in the drum with the error becoming greater as the drum pressure decreases

lower level than exists in the drum with the error becoming greater as the drum pressure increases

higher level than exists in the drum with the error becoming greater as the drum pressure decreases

higher level than exists in the drum with the error becoming greater as the drum pressure increases

692

Steam escaping from the boiler casing is a good indication of .

a leaking tube

a leaking water wall header

a leaking handhole gasket

all of the above are individually correct

693

Steam leaving the desuperheater is used to .

operate the ship service turbo generator

operate auxiliary equipment

supply additional steam for propulsion during overload conditions

provide steam for propulsion during low speed operation

694

Steam line water hammer can be best prevented by .

keeping lines drained and insulated

replacing all 90Elbows with capped tees

always opening steam valves rapidly

keeping steam temperature below the saturation point

695

Steam soot blower piping should be thoroughly drained before operating to prevent .

accidental burner flameout

condensate and feed water contamination

water hammer damage and nozzle/element erosion

overheating the economizer

696

Strainers are installed in boiler fuel oil service lines to .

absorb contaminants

remove solids

decrease viscosity

adsorb water

697

Strainers are installed in boiler fuel oil service lines to .

collect water

remove solids

decrease viscosity

absorb contaminants

698

Strainers are installed in boiler fuel oil service lines to .

absorb contaminants

collect water

decrease viscosity

remove solids

699

Superheated steam is provided to operate the main steam turbine instead of saturated steam due to its . I. higher thermal energy per pound II. lesser erosive action on turbine blading

I only

II only

Both I and II

Neither I nor II

700

Superheated steam is provided to operate the main steam turbine instead of saturated steam due to its . I. higher thermal energy per pound II. lesser erosive action on turbine blading

I only

II only

Both I and II

Neither I nor II

701

Superheaters of the convection type are heated .

by direct contact with the flame

by hot brick work

by gases passing over them

from the fuel bed

702

Testing boiler water for chloride content will indicate the amount of .

total alkalinity in the water

phosphates present in the water

methyl orange that should be added

dissolved salts from sea contamination

703

That portion of the steam drum, containing a manhole for internal access to the drum, for the purpose of cleaning, inspecting, and carrying out repairs, is called the .

end plate

wrapper sheet

drumhead

tube sheet

704

The ability of the device illustrated to produce sound is greatly affected by the adjustments to "B". Another factor that can affect the proper operation of this device is the .

upward movement of "E"

steam pressure being maintained at +/- 10% of design

changing of the orifice at "I"

overall length of "K"

705

The absence of carbon monoxide in the flue gas of a boiler indicates .

efficient combustion

insufficient air

contaminated fuel oil

low carbon content of fuel

706

The advantage of a counterflow fuel oil heater, as compared to a parallel flow fuel oil heater, is that the counterflow heater .

produces a higher oil temperature at any given steam temperature

has a larger heat transfer area providing greater heat transfer

has thinner tube walls providing greater heat transfer

is not subject to coking if overheated

707

The advantage of installing water wall tubes in a boiler furnace is to .

increase the flow of gases through the furnace

decrease the flow of gases through the furnace

increase heat transfer to the mud drum

permit higher combustion rates

708

The amount of fuel oil atomized by a steam atomization burner depends on the atomizing steam pressure, the fuel pressure and the .

sprayer plate size

oil return pressure

furnace air pressure

windbox pressure

709

The amount of oil atomized by a straight mechanical fuel oil burner depends on the sprayer plate size and the .

oil return pressure

fuel oil pressure

forced draft pressure

furnace air pressure

710

The amount of sodium phosphate in treated boiler water can be measured by a/an .

alkalinity test

phosphate test

chloride test

sodium phosphorous test

711

The arc through which a steam soot blower element blows is regulated by the .

control air pressure

direction of element rotation

steam supply pressure

cam profile

712

The atmospheric drain tank (ADT) normally drains to the .

main and/or auxiliary condenser

reserve feed tanks

main and/or auxiliary air ejector condenser

distillate tank

713

The automatic recirculating valve in the main condensate recirculating line is controlled by a temperature sensor which is located at the .

air ejector condensate discharge

main condensate pump discharge

condensate inlet to the main air ejectors

main condensate pump suction

714

The automatic recirculating valve in the main condensate recirculating line is designed to be controlled by which method?

Thermostatic control

Main condenser salt water pressure controller

Exhaust steam pressure controller

Preset electric timing device

715

The auxiliary exhaust system shown in the illustration can be supplied by steam from the .

turbo generators

IP bleed system

LP bleed system

distilling plant

716

The best conductor of heat in a marine boiler is .

steel

water

steam

brick

717

The boiler downcomers shown in the illustration are .

exposed to the radiant heat of the furnace

located away from furnace heat

installed directly adjacent to the superheater

supported by refractory

718

The boiler economizer provides additional heat to the .

fuel oil entering the furnace

air supply entering the furnace

steam leaving the superheater

feed water entering the boiler

719

The boiler feed water control valve varies the unity relationship between steam and water flow during periods of .

minimum boiler load

steady boiler load

overload operation

load change

720

The boiler fuel oil service pump normally takes suction from the .

fuel oil heater discharge

fuel oil settler tank high suction

fuel oil settler tank low suction

fuel oil storage tanks

721

The boiler fuel oil service pump normally takes suction from the .

fuel oil heater discharge

contaminated drain inspection tank

fuel oil settler tank

double bottom fuel tanks

722

The boiler fuel oil system 'hot' strainers are also known as .

coarse strainers

magnetic strainers

discharge strainers

cestus strainers

723

The boiler fuel oil system suction strainers are also known as the .

'cold' strainer

'hot' strainer

'fine' strainer

magnetic strainer

724

The boiler gage glasses should be periodically blown down to .

test the feed water stop- check valve

provide accurate water samples for the second assistant

maintain the proper water level in the steam drum

remove any sediment buildup in the gage glass

725

The boiler main feed pump aboard ship can operate with high temperature water without becoming vapor bound because the .

pump operates at a high discharge pressure

constant-pressure governor controls the discharge pressure

area above the impeller eye is vented to the main condenser

minimum required net positive suction pressure is provided by the DC heater

726

The boiler main feed stop check valve is located nearest the .

DC heater feed water outlet

first stage feed water heater outlet

boiler water drum inlet

main feed water regulator inlet

727

The boiler screen tubes shown in the illustration connect the .

upper front header and water drum

upper front header and steam drum

lower front header and steam drum

steam drum and mud drum

728

The boiler shown in the illustration has its screen tubes connecting the steam drum and the component label ' '.

I

G

F

D

729

The boiler shown in the illustration, arrow "O" indicates the .

main generating tubes

superheater tubes

screen tubes

soot blower elements

730

The boiler superheater shown in the illustration is a/an .

horizontal U-type

overdeck convection- type

vertical U-type

overdeck integral-type

731

The boiler superheater vent, shown in the illustration, is connected to the part labeled ' '.

C

M

D

J

732

The boiler water gage glasses should be blown down .

when you are in doubt about the water level

twice each day on the midnight and afternoon watches

every 12 hours of steady boiler steaming operation

when the boiler water level changes in a steaming boiler

733

The boiler water level begins to fall very slowly due to the sudden failure of a water wall tube. In response to this situation, you should continue the feed water supply and immediately .

reduce the firing rate of the boiler

secure the forced draft fans

secure the fires and secure the feed water when the level falls out of sight in the gage glass

gag the drum safety valves to prevent loss of steam

734

The boiler wrapper sheet, shown in the illustration, is indicated by arrow .

A

B

H

I

735

The bottom blow valve on a water-tube boiler is usually attached to the .

steam and water drum

boiler mud drum

external downcomers

floor tubes

736

The bottom blow valve should be used to remove sludge and solids which have settled out of circulation after the boiler .

is at full load

is at low load

is secured

is being brought up to steaming pressure

737

The BTU value of fuel oil is determined by a/an .

open cup test

calorimeter

hydrometer

viscosimeter

738

The burner front refractory should be replaced when the slag accumulation causes .

the burner flame pattern to be distorted

slight radial cracking around the burner cones

the flame scanners to sense false signals from the glowing brickwork

overheating of the burner atomizer tips

739

The Butterworth heater (tank cleaning heater) shown in the illustration is designed to operate at a nominal steam pressure of approximately .

130 psi

240 psi

450 psi

850 psi

740

The Butterworth heater shown in the illustration receives steam at approximately .

130 psi

170 psi

205 psi

850 psi

741

The combustion air pressure is increased when using the steam soot blowers to 'blow tubes' in order to . I. aid in the process of removing soot deposits II. prevent the steam from extinguishing the fires

I only

II only

Both I and II

Neither I nor II

742

The component labeled "F" as shown in the illustration is .

one of the retractable soot blower elements

a regenerative air heater

one of the main burner assemblies

a permanently installed Orsat apparatus

743

The component lettered "J" shown in the illustration serves as a .

water drum

support beam

side water wall header

screen tube header

744

The component shown in the illustration depicts a/an .

safety valve escape pipe expansion joint

spray attemperator with a thermal sleeve

internal feed pipe and shell connection

dry pipe and shell connection

745

The components lettered "O" shown in the illustration function to .

clean soot off the surrounding tubes

support the surrounding tubes

provide viewing of the generating tubes

acid clean the surrounding tubes during cold plant maintenance

746

The concentration of total dissolved solids in boiler water could increase as a result of .

infrequent bottom blows

zero water hardness

dissolved oxygen deaeration

priming and carryover

747

The concentration of total dissolved solids in the boiler water can increase as a result of .

frequent surface blows

dissolved oxygen deaeration

zero water hardness

insufficient blow down

748

The connection labeled "B" in the illustration is used to .

maintain a vacuum in the shell of the feed water heater

provide a point of admission for the steam air heater drains

provide a point of admission for the L.P. bleed steam

drain condensate from the feed water heater to the main condenser

749

The connection labeled "C" in the illustration, is used to .

maintain a vacuum in the shell of the feed water heater

provide a point of admission for the steam air heater drains

provide a point of admission for the L.P. bleed steam

drain condensate from the feed water heater to the main condenser

750

The connections labeled "A" in the illustration, are used to .

maintain a vacuum in the shell of the feed water heater

provide a point of admission for the steam air heater drains

provide a point of admission for the L.P. bleed steam

drain condensate from the feed water heater to the main condenser

751

The connections labeled "D" in the illustration .

maintain a vacuum in the shell of the feed water heater

provide a point of admission of the steam air heater drains

provide a point of admission of the L.P. bleed steam

drain condensate from the feed water heater to the main condenser

752

The contaminated drain system normally receives drains that may be exposed to .

salt water contamination

spoiled food contamination

oil contamination

water contamination due to boiler treatment

753

The contaminated steam system is secured for repairs. Live steam is supplied to the fuel oil heating system and its returns are directed to the drain tank. Considering these circumstances, an undetected leak in an idle fuel oil heater could eventually lead to .

secondary combustion

boiler tube failures

low stack gas temperatures

sputtering burners and possible loss of fires

754

The control desuperheater of most boilers functions to control .

superheated steam flow

desuperheated steam temperature

superheater inlet temperature

superheated steam temperature

755

The cooling water flow from an air ejector intercondenser and aftercondenser is discharged directly into the .

main condenser hot well

auxiliary condenser hot well

condensate and feed system

atmospheric drain tank

756

The correct method of expanding a generating tube at the boiler drum tube sheet is to roll .

to a depth less than the thickness of the drum tube sheet

to a depth greater than the thickness of the drum tube sheet

heavily at the tube end prior to welding the tube to the drum tube sheet

slightly at the tube end prior to welding the tube to the drum tube sheet

757

The DC heater automatic level dump valve is used to .

divert the flow of condensate from the first stage heater to the vent condenser

maintain a proper condensate level in the condenser hot well

recirculate condensate to the atmospheric drain tank

drain excess feed water to the distilled water tank

758

The DC Heater functions to .

store, heat, and deaerate feed water

chemically treat feed water to remove carbonic gas

ensure recirculation in the feed water system

remove the major amount of non- condensable gases from the main condenser

759

The DC heater functions to .

remove air from feed water

heat feed water

store feed water

all of the above

760

The degree of fuel oil atomization is dependent upon the .

boiler furnace size and shape

air pressure at the furnace

air supply temperature

atomizer design and oil viscosity

761

The depth of fuel oil in a double bottom tank is measured through the .

vent line

depth gage

manhole cover

sounding tube

762

The designed 'end point for combustion' for a boiler furnace is reached when .

the amount of heat being transferred to the tubes reaches a maximum no matter how much the firing rate is increased

panting of the furnace accompanied with black smoke takes place

the maximum rate the boiler can generate steam is reached

the boiler is operating at its maximum fuel oil firing rate

763

The development of pinhole leaks where the boiler tubes enter the water drums and headers, may be evidence of .

gas laning

soot corrosion

excess alkalinity

excess hydrazine

764

The device shown in the illustration is a/an .

air ejector

deaerator

desuperheater

eductor

765

The difference between the temperature of the condensate discharge and the temperature corresponding to the vacuum being maintained at the exhaust inlet to the main condenser is defined as .

main circulator loss

condensate depression

condensate recession

absolute condenser temperature

766

The differential temperature of the main condenser circulating water during normal operation will be affected by . I. Change in circulating pump speed II. The addition of make up feed

I only

II only

Both I and II

Neither I nor II

767

The differential temperature of the main condenser circulating water will be affected by . I. decrease in circulating pump pressure II. degree or amount of scaling or fouling

I only

II only

Either I or II

Neither I nor II

768

The differential temperature of the main condenser cooling water will be significantly affected by a change in .

sea temperature

condensate pump pressure

volume of cooling water flow

boiler feed pump pressure

769

The diffuser of a burner register assembly .

acts as a shield to prevent flare back

shapes the fuel particles into a cone

serves to make the air mix evenly with the oil

adds heat to the fuel particle cone

770

The distance piece in a boiler burner register assembly, provides for adjustment of the .

diffuser to attain the desired amount of secondary air flow

atomizer position to obtain the best mixing of air and oil

quantity of the primary and secondary air cones for best air flow

total volume of air and fuel admitted through the register

771

The distance piece in a boiler burner register assembly, provides for adjustment of the .

burner throat opening to attain the desired amount of secondary air flow

diffuser position with relation to the atomizer tip

fuel oil flame cone angle

total volume of air admitted through the register

772

The downcomer tubes installed in modern water tube boilers would normally be located .

outside of the boiler double casing

between the inner and outer boiler casings

inside of the boiler inner casing

in the furnace gas passages

773

The effects of shrink and swell on boiler water levels can be minimized by .

providing a constant surface blow

rapidly opening and closing the throttles during maneuvering

avoiding rapid opening and closing of the throttles while answering bells

installing an automatic single-element feed water regulator

774

The efficiency of boiler combustion can be measured by the relative proportions of certain elements in the flue gases. The elements measured are .

nitrogen, carbon dioxide, and oxygen

nitrogen, carbon monoxide, and oxygen

carbon dioxide, oxygen, and carbon monoxide

nitrogen, carbon dioxide, and carbon monoxide

775

The 'end point for combustion' for a boiler furnace is reached whenever .

the amount of heat being transferred to the tubes reaches a maximum no matter how much the firing rate is increased

panting of the furnace accompanied with black smoke takes place

the maximum rate at which the boiler can generate steam

the capacity of the sprayer plates at the designed pressure for the system is attained

776

The end product of reactions occurring when boiler water is chemically treated, remain in the boiler and increase the need for .

acid cleaning

makeup feed

boiler blow down

waterside corrosion treatment

777

The end products of reactions occurring when boiler water is chemically treated, remain in the boiler and increase the need for .

makeup feed

acid cleaning

boiler blow down

waterside corrosion treatment

778

The entire unit which houses the burner, air scoop, air doors and bladed cone is correctly called the .

burner assembly

register assembly

atomizer assembly

air duct assembly

779

The feed water heater shown in the illustration is actually comprised of three separately functioning heat exchangers. These heat exchangers are identified as the .

first stage heater, gland exhaust condenser, and drain cooler

first stage heater, inter condenser, and after condenser

inter condenser, after condenser, and gland exhaust condenser

drain cooler, distillate condenser, and fresh water drain collector

780

The feed water heater shown in the illustration was designed to maintain the required feed water outlet temperature with an approximate 10" (25.4 cm) Hg shell vacuum. If the shell vacuum is increased to approximately 16" (40.64 cm) Hg vacuum, the .

overall plant operating efficiency will increase

vacuum in the main condenser will drop as the feed heater shell vacuum increases

feed water outlet temperature will decrease

flow rate of condensate to the feed heater will increase

781

The feed water heater shown in the illustration was designed to maintain the required feed water outlet temperature with an approximate 10" Hg shell vacuum. If the shell vacuum is decreased to approximately 8" Hg vacuum, the .

overall plant efficiency will increase

vacuum in the main condenser will increase as the feed heater shell vacuum increases

flow rate of condensate to the feed heater will decrease

feed water outlet temperature will increase

782

The fins on the tubes of a fin type fuel oil heater are provided to .

clean the fuel oil

prevent tube erosion

decrease fuel flow

increase heater efficiency

783

The fireman/watertender secures the fires because there is no visible water level in the gage glasses of a steaming boiler. Upon inspection, you observe condensate trickling down the inside of the gage glass. This indicates .

high water level

low water level

priming

steam binding of the feed water regulating valve sensing line from the top of the steam drum

784

The firing range of a steam assisted fuel atomizer is regulated to cope with changes in the steam demand by varying the .

fuel oil return pressure

fuel oil supply pressure

steam atomization temperature

shape of the atomized fuel cone

785

The first and second stage air ejectors used with large sea water cooled steam, surface type condensers are designed to . I. establish vacuum II. maintain vacuum

I only

II only

Both I and II

Neither I nor II

786

The first and second stage air ejectors used with main steam condensers are designed to . I. establish vacuum II. increase condensate temperature

I only

II only

Both I and II

Neither I nor II

787

The fittings labeled "P" shown in the illustration are known as the .

main steam stops

main steam outlets

desuperheater outlets

safety valve nozzles

788

The flash point of a residual fuel oil should be used to determine the .

highest temperature to which the oil may be heated for atomization

minimum temperature to which the oil should be heated for transferring

highest temperature to which the oil may be heated in a storage tank

minimum temperature to which the oil should be heated in the fuel oil heater

789

The flash point of a residual fuel oil should be used to determine the highest temperature to which the oil may be heated .

for atomizing

for centrifuging

in a storage tank

in the recirculating line

790

The formation of a pit in a boiler tube is most likely to occur when .

waterside deposits are present

sludge is present

dissolved oxygen is present

the tube metal acts as a cathode

791

The formation of a pit in the surface of a boiler tube is most likely to occur when .

waterside deposits are present

sludge is present

the tube metal acts as an anode

dissolved minerals are present

792

The fuel oil has been raised to the proper temperature for the straight mechanical atomization system of the boiler shown in the illustration, and is ready to light off. Which of the valves listed must be closed just prior to igniting the fuel?

J

G

A

H

793

The fuel oil meter in the fuel oil service system should be bypassed when .

transferring fuel from storage to settler tank to avoid erroneous fuel consumption readings

conducting programmed routine maintenance of the meter while underway

warming the oil in the burner headers by recirculation prior to boiler light off

finished with engines is given by the bridge

794

The function of a safety valve on a marine boiler is to prevent the pressure in the boiler from rising above .

design test pressure

maximum allowable working pressure

the pressure used in the accumulation test

the hydrostatic test pressure

795

The function of downcomers installed in water-tube boilers is to .

accelerate of water circulation

decrease the end point for moisture carryover

distribute feed water within the drum

decrease the rate of steam generation

796

The function of item "E" shown in the illustration is to .

pulse supply steam or air to chamber "M"

allow steam/condensate or air to be evacuated from the unit as sound is produced

act as a reed to enable the production of sound

control the admission of steam into chamber "L" as part of the process to produce sound

797

The generating tubes in an operating boiler will overheat and possibly fail when the boiler reaches the end point of .

evaporation

generation

combustion

circulation

798

The gland exhaust fan draws steam and non-condensable vapors from the gland exhaust condenser and discharges to the .

atmospheric drain tank

atmosphere

main condenser

vent condenser

799

The glass used in a flat-type boiler water gage is protected from the hot steam and water by a/an .

asbestos gasket

mica shield

felt cushion

copper insulator

800

The greatest deterrent to heat transfer from the fireside to the waterside of a boiler is .

water film

water eddies

gas film

gas eddies

801

The greatest heat loss in an oil fired boiler is from .

conduction through tube metals

radiation through the furnace casing

combustion gases leaving the stack

incomplete fuel oil combustion

802

The greatest resistance to heat transfer from the fireside to the waterside of a water-tube boiler takes place in the .

steel tube wall itself

soot buildup directly on the tube exterior

gas film layer surrounding the tube

moving water and steam inside the tube

803

The greatest single overall loss of efficiency in a marine propulsion steam plant cycle results from .

heat lost in the main condenser

poor heat transfer in feed water heaters

mechanical losses in the atomization process

heat loss required for fuel oil heating

804

The guarding valve installed in a boiler bottom blow line prevents .

loss of steam and water from a steaming boiler due to a leaking bottom blow valve

leakage from the blow line back to an idle boiler

entry of seawater into idle boilers due to leaking skin and bottom blow valves

all of the above

805

The illustrated burner atomizer assembly is .

straight mechanical

used only for variable load steam atomization

an example of a rotary cup type atomizer

used in a return flow type burner management system

806

The illustrated device is designed as a .

water and steam separator

oil and water separator

liquid eductor

steam whistle

807

The inability to maintain proper boiler water alkalinity, phosphate, or pH levels in a steam boiler, indicates a leak in the .

economizer drain line

DC heater

desuperheater

superheater drain line

808

The internal feed pipe in a D-type marine boiler .

distributes feed water evenly throughout the steam drum

guides the feed water toward the downcomer tubes

is located well above the normal steam drum water level to assist in deaeration of feed water

is drilled with holes to provide even distribution of boiler feed water chemicals

809

The internal feed pipe in a D-type marine boiler provides .

distribution of feed water evenly throughout the steam drum

guidance of the feed water towards the downcomers as it enters the water drum

cooling for the internal cyclone separators

cooling for the superheater tube bank

810

The internal feed pipe in a D-type marine boiler provides . I. distribution of feed water evenly throughout the water drum II. guidance and distribution of chemicals throughout the steam drum

I only

II only

Both I and II

Neither I nor II

811

The internal feed pipe of a power boiler distributes the feed water into the .

mud drum

water drum

steam drum

economizer

812

The item labeled "C" in the illustration, is the .

low pressure drain connection

high pressure drain connection

low pressure vent connection

low pressure steam supply connection

813

The items labeled "A" in the illustration are the .

low pressure drain connections

high pressure drain connections

low pressure vent connections

low pressure steam supply connections

814

The items labeled "C" and "L" as indicated on the illustration are commonly called .

mica sheets

face plates

cork gaskets

glass plate inserts

815

The items labeled "D" and "M" as indicated on the illustration are commonly called .

mica sheets

face plates

cork gaskets

glass inserts

816

The items labeled "D" in the illustration are the .

low pressure drain connections

high pressure drain connections

low pressure vent connections

low pressure steam supply connections

817

The last two digits stamped on a fuel oil atomizer sprayer plate represents the cross-sectional area ratios of the tangential slots and orifice. This ratio determines the .

density of the oil spray

degree of atomization

angle of the cone

capacity of the atomizer

818

The leakage of air into the pump casing by way of the packing gland of a condensate pump, is prevented by .

special packing in the stuffing box

a water seal line to the packing gland

an air seal line from the compressed air line

the vacuum in the pump suction

819

The level in the atmospheric drain tank is normally maintained by the use of a/an .

overflow to the bilges

float-type regulator

vacuum drag to the air ejector condenser

overflow to a distillate tank

820

The level in the atmospheric drain tank when underway at sea, is normally maintained by the use of a/an .

overflow to the bilge drain tank

float-type regulator draining to the main condenser

vacuum drag to the air ejector condenser

overflow to a distillate tank

821

The life of the furnace lining can be affected by .

the quality of installation

the service environment

the proper application of inspection criteria

all of the above

822

The limiting factor in determining the end point for combustion is usually the .

shape of the burner

size of only the sprayer plates

fuel oil pressure as the only concern

ability of the forced draft fan to supply combustion air

823

The loop seal connected to the main condenser returns the drains from the .

vent condenser

intercondenser

aftercondenser

all of the above

824

The lower section of the feed heater, labeled "E" in the illustration is used as the .

drain cooler

gland exhaust condenser

after condenser

first stage heater

825

The main boiler feed pump discharge is controlled by the admission of steam to the auxiliary turbine. The admission of steam is normally regulated by a .

flyweight controlled regulating valve

multi nozzle arrangement

constant speed limiting governor

constant pump discharge pressure governor

826

The main condensate pump in a steam propulsion plant discharges directly to the .

air ejector intercondenser

main condenser hot well

air ejector aftercondenser

DC heater vent condenser

827

The main condenser is losing 2" Hg vacuum every 5 minutes. In an hour, the absolute pressure will have increased by approximately .

6 psia

12 psia

16 psia

24 psia

828

The main feed check valve functions to .

check pressure pulsations in the feed line

prevent backflow of water from the boiler in the event of a feed pump failure

provide feed pump positive discharge head

reduce feed pump discharge pressure loading

829

The main function of a desuperheater is to .

maintain uniform steam flow through the superheater while providing auxiliary steam as required

heat the water in the drum while maintaining sufficient flow through the generating tubes

provide the boiler with additional steam generating surface while providing a sufficient reservoir for surface blow

heat the water in the drum while providing additional steam generating surface in the boiler

830

The main purpose of the boiler steam drum component shown in the illustration is to .

permit expansion during pressure surges

prevent thermal shock

reduce vibration

reduce the possibility of priming

831

The main reason for having a low suction line on the fuel oil service or settling tanks is to .

prevent loss of suction during rough weather

decrease suction head on the pump

increase the amount of fuel available for use

facilitate water removal

832

The main reason for keeping an operating boiler burner register fully open while steaming is to prevent .

boiler explosions

the fires being blown out

boiler register warping

improper fuel/air mixture

833

The main steam stop bypass valve is used to .

isolate the main steam stop for repairs while steaming

gradually increase the pressure and temperature of the main steam piping when warming up

cross-connect two steaming boilers

supply auxiliary steam when the main steam stop is closed

834

The main steam stop valve on a "D" type marine boiler is located at the .

desuperheater outlet

desuperheater inlet

superheater outlet

superheater inlet

835

The major heat loss in a marine boiler is from the heat .

used in the economizer and air heater

passing through the boiler casing

of combustion gases leaving the stack

required to change water into steam

836

The major heat loss in an oil fired boiler is the heat .

used in the economizer and air heater

passing through the boiler casing

going up the stack

required to change water into steam

837

The major reason dissolved gases are removed from boiler feed water is because they may cause .

condenser vacuum loss

corrosive conditions in the boiler

a false boiler water level

vapor lock in the feed pumps

838

The MAWP of a boiler is 900 psi and the normal drop across the superheater is 20 psi. If the superheater safety valve is set to lift at 825 psi, the minimum settings of the drum safety valves allowed by Coast Guard Regulations would be .

825 psi

850 psi

875 psi

900 psi

839

The maximum allowable working pressure of a particular boiler is 1050 psig (7340 kPa). The hydrostatic test pressure to be used during the Coast Guard required quadrennial inspection will be .

1050 psig (7340 kPa)

1312 psig (9146 kPa)

1575 psig (10959 kPa)

1850 psig (12855 kPa)

840

The means of circulation commonly found in water-tube boilers is .

compound

accelerated natural

cross-compound

integral

841

The measured gap between the face of the burner atomizer tip nut and the diffuser plate, is determined by the setting of the .

atomizer tip nut

distance piece

sprayer plate

diffuser plate

842

The mid section of the feed heater, indicated by "F" in the illustration is used as the .

drain cooler

gland exhaust condenser

after condenser

first stage heater

843

The minimum design height of the DC heater is determined by the .

dew point temperature of the stack gases

minimum net positive suction head required by the main feed pump

maximum condensate pump discharge pressure

desuperheater outlet temperature

844

The minimum feed water inlet temperature to a boiler economizer is determined by the .

dew point temperature of the stack gas

superheater outlet temperature

surface area of the third stage heater

radiant heat transfer in the furnace

845

The minimum temperature requirements for fuel oil in storage tanks is related to the .

fire point of the oil

pumpability of the oil

size of the containment area in case of overflow

size of the vents

846

The most common cause of abnormal fireside burning of the boiler superheater tubes can "indirectly" be the result of .

combustion gases impinging on the tubes

fuel droplets striking the hot tubes

excessive boiler water carryover

the tubes being subjected to excessive vibration

847

The MOST common cause of heat blisters developing on boiler generating tubes is due to .

waterside deposits

flame impingement

gas laning

insufficient water circulation

848

The most effective way to eliminate sludge from the water drum of a boiler is to .

frequently use the surface blow

chemically treat the boiler water

wash the boiler watersides

give the boiler a bottom blow

849

The most harmful slag forming compounds found in fuel oils are .

iron and sulphur

vanadium and sodium

potassium and nickel

calcium and silica

850

The most important consideration to take into account when water washing the firesides of a water tube boiler is .

the corrosive effects of sulfuric acid

the rusting of boiler tubes

possible damage to the outer casing

possible damage to the smoke periscope

851

The most practical method of determining the condition of a shaft bearing while the shaft is in operation is to .

visually inspect the bearing

check the lube oil temperature

check the lube oil viscosity

perform a carbon blot test on an oil sample from the bearing

852

The most serious fireside burning of the boiler superheater tubes can be INDIRECTLY attributed to .

combustion gases impinging on the tubes

fuel droplets striking the hot tubes

excessive boiler water carryover

the tubes being subjected to excessive vibration

853

The most serious fireside burning of the boiler superheater tubes is the result of .

combustion gases impinging on the tubes

fuel droplets striking the hot tubes

carbon steel tubes being heated above 750F

the tubes becoming steam bound or dry

854

The most troublesome corrosive substances in boiler water are oxygen and .

hydrogen sulfide

sulfur dioxide

carbon dioxide

ammonia

855

The net positive suction head of a boiler centrifugal feed pump should be calculated over and above the .

feed water vapor pressure

speed of the impeller

pump capacity in gpm

impeller ratio of the pump

856