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

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

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

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

New Steam Plants II Questions from 25 Sept 2012


1

A back pressure trip on a ship's service turbo-generator functions to trip the turbine under what circumstance?

lubricating oil pressure is too low

amount of cooling water to the condenser is excessive

gland seal leakoff pressure is too high

amount of cooling water to the condenser is insufficient

2

A back pressure trip on an auxiliary turbo generator functions to secure the device if the .

oil pressure is too low

discharge pressure of a turbine driven pump is excessive

gland seal leakoff pressure is too high

exhaust pressure rises above a preset limit

3

A bridge gage is normally used to determine turbine .

bearing oil clearance

diaphragm tip clearance

blade axial clearance

bearing wear

4

A bridge gage is used to measure .

blade tip leakage

rotor bearing wear

axial clearances

thrust bearing wear

5

A centrifugal oil purifier should be shut down if the .

presence of oil is indicated in the gravity tank bull's-eye

observation cover clamp needs tightening

purifier is vibrating badly

trapped water is discharged from the overflow line

6

A centrifuge should satisfactorily remove which of the listed substances from lube oil?

Fuel oil

Gasoline

Water

Diesel fuel

7

A centrifuge will satisfactorily remove which of the listed substances from lube oil?

Diesel fuel

Gasoline

Fuel oil

Carbon particles

8

A cloudy or milky appearing lube oil sample, taken from the main lubricating oil system could be caused by .

insufficient cooling water to the lube oil cooler

excessive cooling water to the lube oil cooler

insufficient gland sealing steam

excessive gland sealing steam

9

A common cause of the babbitt linings cracking in a turbine journal bearing is from .

prolonged operation at low speed

prolonged operation at full speed

vibration generated by the rotor

excessive thrust bearing wear

10

A common method of preheating main turbine lube oil prior to rolling over the main unit would be to .

run both the lube oil pumps simultaneously

operate the lube oil purifier on the main lube oil sump

slightly increase gland sealing steam pressure

bypass the lube oil gravity tank

11

A constant speed hydraulic governor would more than likely be installed on a .

turbo generator

main propulsion turbine

main feed pump

main condensate pump

12

A convergent-divergent nozzle functions to .

reverse steam flow direction

control turbulent steam expansion

decrease steam velocity and increase steam pressure

decrease the specific volume of steam

13

A disk-type centrifuge is set up for continuous use on the main turbine lube oil system. In order to batch centrifuge a small quantity of diesel oil from a storage tank, .

the speed of the centrifuge must be increased

another centrifuge should be used to avoid the possibility of contaminating the main lube oil system

the number of conical disks must be increased

the feed temperature must be decreased to 170F

14

A gravity type lube oil system for a steam vessel will have a remote pressure sensing device installed on the main lube oil header of the main turbine unit to enable the watch engineer to . I. determine if there is a normal level of lube oil in the gravity tank II. be certain that the bearings are being adequately lubricated

I only

II only

Both I and II

Neither I nor II

15

A Kingsbury, or pivot shoe type thrust bearing, can bear much greater loads per square inch of working surface than can parallel surface bearings because provisions are made in the Kingsbury bearing .

for adjusting the filler piece thickness behind the pivotal-shoes to give a more accurate fit

for automatically adjusting clearances to the correct value when wear occurs

for the shoes to tilt slightly, thereby allowing the formation of a wedge shaped oil film under a thrust load

to allow the leveling plates to pivot on the collar when thrust loads are applied

16

A lube oil sample is taken from the main engine lube oil system and visually inspected. Which of the following would indicate water contamination?

A milky-white color

A clear, amber color

A black color

A reddish-orange color

17

A lube oil sample taken from the main engine lube oil system has a dark yellow opaque color. This is the result of .

water contamination

mixing oils of two widely different viscosities

overheating

aeration

18

A motor driven synchronizing device, figure "D" shown in the illustration, operated from the generator switchboard, initiates fine adjustments to the steam turbine speed by directly .

raising or lowering the nozzle block lifting beam

changing the vertical location of the pilot valve bushing

increasing or decreasing operating spring pressure

varying the pivot rod stroke length on the governor weight eccentric pad

19

A nozzle in an impulse turbine functions to .

reverse steam flow direction

guide the steam through the fixed blades

convert the steam's thermal energy to kinetic energy

convert the steam's kinetic energy to thermal energy

20

A pilot valve and servomotor are utilized in mechanical- hydraulic governing systems on a turbo generator unit in order to .

provide sufficient force to operate large steam lifting beam control valves

provide a means of maintaining constant output voltage

allow parallel operation with zero speed droop

constant load on the turbine unit

21

A poorly cleaned lube oil purifier bowl may result in .

insufficient oil supply to the gravity tank

improper separation

excessive lube oil consumption

excessive water discharge rate

22

A power failure in the hydraulic system of a compact type steering gear would cause the rudder to .

swing 35 right or left

remain locked in its last position

move to the midship position automatically

jam against the rudder emergency stops

23

A pressure drop occurs across both the moving and fixed blades of a reaction turbine as a result of the .

reversing blades causing a velocity drop with resultant pressure drop

conversion of the thermal energy to pressure energy always resulting in a pressure drop

interstage diaphragms creating a nozzle effect in the steam flow

moving and fixed blades being shaped to act as nozzles

24

A pressure-velocity compounded impulse turbine consists of .

velocity compounding with reaction pressure compounding

several rows of moving blades attached to diaphragms

two or more stages of velocity compounding

two or more rows of nozzles in which no pressure drop exists

25

A rotor position micrometer on a main propulsion reaction turbine measures rotor .

radial position relative to the casing

radial position relative to the micrometer

axial position relative to the casing

axial position relative to the micrometer

26

A sequential lift, nozzle valve control bar on a turbo generator, utilizes which of the following operating principles?

A lifting beam mechanism engages nozzle valve stems of varying lengths.

A hydraulic piston raises or lowers groups of valves according to pressure received from a governor.

A hydraulic piston raises or lowers individual valves according to pressure received from a governor.

A servomotor, mechanically connected to nozzle valve hand wheels, opens or closes the valves in accordance with the type of electrical signal received.

27

A ship is equipped with the illustrated turbine gear set and a right hand turning propeller. When steam is admitted to the astern element, with sternway on, the high-speed gear on the high pressure side is .

rotating the same direction as the low- speed pinion on the low pressure side.

turning the same rotation of the high- speed pinion on the low pressure side.

turning opposite to the rotation of the high- speed gear on the low pressure side.

turning counter clockwise as viewed from the aft end of the reduction gear.

28

A ship is equipped with the illustrated turbine gear set and a right hand turning propeller. When steam is admitted to the astern element, with sternway on, the high-speed gear on the high pressure side is .

rotating in the opposite direction as the low- speed pinion on the low pressure side as viewed from the aft end of the reduction gear.

turning clockwise as viewed from the forward end of the reduction gear.

turning opposite to the rotation of the high- speed gear on the low pressure side.

turning clockwise as viewed from the aft end of the reduction gear.

29

A ship is equipped with the illustrated turbine gear set and a right hand turning propeller. When steam is admitted to the astern element, with sternway on, the high-speed pinion on the high pressure side is .

rotating in the same direction as the low- speed pinion on the low pressure side.

turning counter clockwise as viewed from the aft end of the reduction gear.

turning the same direction as the high- speed gear on the low pressure side.

turning the opposite direction as the low speed reduction gear.

30

A steam driven 750 KW turbo generator has a rated speed of 1200 RPM. The overspeed setting for this unit must not exceed .

1320 RPM

1380 RPM

1440 RPM

1500 RPM

31

A steam propelled tank ship is operating at sea and despite troubleshooting the system by all the vessel's engineers, the transfer of fuel to the settler has not been possible and the settler will be empty in a few minutes. As the watch engineer, your NEXT step should be to .

repeat all the steps that have been taken to determine the cause of the problem

call out other engineers for assistance

line up the diesel cold start system

stop the main engine and secure the generator

32

A steam vessel is operating at sea and despite troubleshooting the system by all the vessel's engineers, the transfer of fuel to the settler has not been possible and the settler will be empty in a few minutes. As the watch engineer, your NEXT step should be to .

activate the "engineer needs assistance" alarm

line up the diesel cold start system

warm up the emergency generator

repeat all the steps that have been taken to determine the cause of the problem

33

A turbine assembly in which steam flows in series through a high pressure turbine and then on to a low pressure turbine, with both turbines driving a common reduction gear through separate shafts, is classified as .

dual series

cross-compound

tandem-compound

tandem, double flow

34

A turbine diaphragm functions to .

support moving blades and shrouding in an impulse turbine

provide support for interstage packing in a reaction turbine

support the nozzles and direct the flow of steam in an impulse turbine

decrease steam velocity in the nozzles of an impulse turbine

35

A turbo generator back pressure trip can be actuated as a result of .

insufficient circulating water flow through the condenser

a steam inlet valve being partially open

an excessive pressure drop through the turbine

excessively low exhaust pressure

36

A turbo-generator governing system maintains constant turbine speed by using a flyweight-actuated pilot valve to control hydraulic oil flow to a lifting beam operating cylinder, which in turn, .

changes the position of the turbine throttle valve

controls the opening or closing of turbine nozzle valves in the steam chest

controls the steam pressure in the steam chest

regulates steam back pressure

37

According to illustration SE-0019, piston "F" in the gland seal regulator is moved upward by .

steam pressure

control air

lube oil pressure

nitrogen

38

According to the illustration (SE-0019), bellows "I" in the gland seal regulator is actuated by .

gland seal steam pressure

control air pressure

lube oil pressure

steam throttle pressure

39

According to the illustration, what is the normal function of the component shown?

act as a final filter for oil entering a bearing

indicate the temperature and flow of lube oil leaving a turbine bearing

indicate the pressure and flow of lube oil entering a turbine bearing

indicate the pressure and temperature of lube oil leaving a turbine bearing

40

After one year of operating the bearing shown in the illustration, the reading obtained at point "A" would always be equal to the .

reading stamped on the gage only

designed oil clearance

designed oil clearance plus the stamped bridge gage reading

stamped bridge gage reading plus the bearing wear

41

After properly lining up the main propulsion turbine for warm up, steam should first be admitted to the rotor through the .

ahead throttle valve

astern throttle valve

HP turbine bleed valve

LP turbine bleed valve

42

After setting the allowable end play of the thrust bearing shown, you would establish the axial position of the turbine shaft by .

increasing the thickness of the adjusting ring

decreasing the thickness of the adjusting ring

changing the thickness of the thrust collar

changing the thickness of the filler piece

43

After starting the main lube oil pump in a gravity-type lube oil system, you should verify that the gravity tanks are full by .

looking at the overflow sight glass

sounding the gravity tanks

sounding the lube oil sump

observing the flow from the bearings

44

After starting the main lube oil pump in a gravity-type lube oil system, you should verify that the gravity tanks are full by .

observing the overflow sight glass

sounding the gravity tanks

sounding the lube oil sump

observing the flow from the bearings

45

After the housing has been bolted down, the final check of reduction gear tooth contact is usually made by .

alignment gauges

dial indicators

bluing the teeth

bridge gauges

46

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

the pump overspeeding

erratic rudder response

bubbles in the sight glass

ram relief valves lifting

47

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

an improper rudder response

hammering noises in the equipment or transmission lines

popping or sputtering noises

all the above

48

Allowance for axial expansion of the steam turbine due to temperature changes is provided for by the use of .

casing flexible joints

rotor position indicators

a deep flexible I beam support

pivoted-shoe type thrust bearings

49

An air vent is installed on some reduction gear casings to .

avoid the accumulation of flammable oil vapors

release air pressure buildup

admit cooling air to the gearing

decrease the possibility of corrosion

50

An auxiliary turbine boiler feed pump should normally be stopped by .

closing the exhaust valve slightly

actuating the throttle hand tripping device

rotating the hand lube oil pump backwards

increasing the load on the driven unit

51

An efficient seal is normally obtained between the upper and lower halves of a turbine casing by .

precision metal-to- metal contact

copper gaskets

asbestos gaskets

flexible steel seal strips

52

An energy loss associated with a reaction turbine, but not an impulse turbine, is .

throttling loss

windage loss

tip leakage loss

leaving loss

53

An excess pressure governor is a special type of control device which would normally be found on a .

main circulator pump

turbine-driven feed pump

low pressure propulsion turbine

forced draft fan

54

An excess pressure governor would normally be used on a .

main circulator pump

turbine-driven feed pump

low pressure propulsion turbine

forced draft fan

55

An excessive power loss in a straight reaction turbine is commonly caused by .

improper nozzle angle

excessive fluid friction

leaking diaphragm packing

abnormal tip leakage

56

An excessive pressure differential across a lube oil strainer could indicate .

the strainer needs cleaning

the filter elements are installed upside down

the relief valve is stuck open

all of the above

57

An excessively high brine level in a flash evaporator can be caused by .

excessive vacuum in the first effect shell

an excessive brine blow down rate

failure of the brine pump

excessive distillate pump speed

58

An impulse-reaction turbine is characterized by which of the following arrangements?

Reaction blading followed by impulse diaphragms.

Stationary nozzles with impulse blading stages.

Reaction stages followed by velocity- compounded blading.

Velocity-compounded stages followed by reaction blading.

59

An increase in clearance between reaction blade tips and the turbine casing will result in .

an increase in rotor thrust load

an increased pressure drop across the blades

an increase in pressure in the following stage

a decrease in pressure in the following stage

60

An increase in clearance between reaction blade tips and the turbine casing will result in .

an increase in rotor thrust load

an increased pressure drop across the blades

decrease in rotor torque

increase in rotor vibration

61

An intermediate chamber is used in conjunction with labyrinth packing on main turbine shaft glands to provide a .

pressure relief during periods of low internal vacuum

sealing steam supply during periods of low internal pressure

sealing steam flow to the throttle

suction path to the air ejectors

62

An overheated bearing in the main propulsion unit is indicated by .

bubbles in the sight flow glasses

sludge in the lube oil strainers

high level in the lube oil sump

high temperature of the lube oil leaving the bearing

63

An unusual vibration in the main propulsion turbine unit, accompanied by a rumbling sound in the reduction gear, could be caused by .

overloading of the condenser

a carryover from the boiler

a reduction in condenser vacuum

a labyrinth seal failure

64

Any abnormal condition or emergency occurring in the fire room must be immediately reported to the .

oiler on watch

engineer on watch

first assistant engineer

U. S. Coast Guard

65

Any abnormal condition or emergency that occurs in the engine room must be reported immediately to the .

first assistant engineer

fireman on watch

Chief engineer

engineer on watch

66

As found in a reduction gear drive system, thrust bearings serve to .

transmit the force produced by the propeller to the structure of the ship

limit the radial movement of the shaft

increase the shaft speed

hold the main engine in place

67

As indicated in the graph, what percentage of rated horsepower is being developed when operating the main propulsion turbine at 80% speed?

10%

25%

50%

80%

68

As indicated in the graph, what percentage of rated horsepower is being used to operate the main propulsion turbine at 30% speed?

1%

4%

10%

40%

69

As lube oil absorbs moisture its dielectric strength can be expected to .

remain the same

decrease

increase with an increase in viscosity

increase with a decrease in viscosity

70

As shown in the illustration (SE-0019), live steam is supplied to the gland seal regulator via .

line "C"

line "D"

line "G"

line "A"

71

As steam first enters the main propulsion turbine, which of the following energy conversions takes place?

potential to kinetic

mechanical to thermal

chemical to thermal

thermal to chemical

72

Axial movement in a gear-type flexible coupling is provided for by .

flexible "I beam" construction

the variable oil clearance in the quill shaft

gear teeth on the floating member sliding between internal teeth on the shaft ring

adjusting the pitch of the teeth on the pinion and high speed gears

73

Axial movement in a gear-type flexible coupling is provided for by .

each gear sliding on its shaft between retaining collars

the variable oil clearance in the quill shaft

gear teeth on the floating member sliding between internal teeth on the shaft ring

adjusting the pitch of the teeth on the pinion and high speed gears

74

Babbitt is a metal alloy commonly used for lining .

bearings

cylinder liners

bearing journals

saltwater piping

75

Babbitt is a metal alloy commonly used for lining .

saltwater piping

valve seats

shim stock

precision bearings

76

Babbitt metal is used to make .

pump packing rings

shaft journals

bearing surfaces

non-sparking tools

77

Because of the pressure drop existing across each diaphragm, the flow of steam between the nozzle diaphragm and the rotor of the turbine is held to a minimum by .

a fluid seal

deflector rings

a babbitt liner

a labyrinth packing ring

78

Because the entire thrust bearing assembly is normally submerged in oil, the pivoting shoe arrangement allows the formation of a continuous wedge shaped oil film shown in the illustration by arrow "B", between the .

leveling plates and collar

base ring and pivoted shoes

leveling plates and buttons

collar and pivoted shoes

79

Before placing the jacking gear in operation on a main turbine unit, you must always insure that .

the gland seal steam system is operating

the main salt water circulating pump is operating

the condensate system is operating

the main lube oil system is operating

80

Bridge gage readings are to be taken on the bearing shown in the illustration. You would use the indicated 3 3/4"R to .

identify the bearing by radius

center the bearing load point

center the bridge gauge

measure the angle to bridge gauge

81

By which of the following means can rotating parts of the main reduction gear be examined?

Inspection covers

Bull's eyes or sight glasses

RT junction boxes

Tachometer drives

82

Carbon ring packing segments are secured in a shaft gland assembly of a steam turbo generator by means of .

garter springs

centering rings

steam pressure

labyrinth rings

83

Cavitation is a term commonly used with centrifugal pumps to describe .

the formation and subsequent collapse of vapor pockets in the impeller

excessive clearances produced on the impeller wearing rings

the laminar flow of the fluid being pumped

water hammer in the pump suction line

84

Chamfers, located at the parting edges of horizontal split sleeve type bearings, are used to facilitate oil storage and distribution. They are machined .

radially the full length of the bearing

axially the full length of the bearing

radially, to within 45 degrees of the normal bearing surface

axially, approaching but not extending to the end of the bearing

85

Clean oil leaves the centrifuge illustrated through item .

K

N

V

X

86

Coast Guard Regulations (46 CFR) concerning lubricating oil systems for main propulsion turbines, require .

the lube oil system to function satisfactorily when the vessel has a permanent list of 25

lube oil coolers to have three separate means of circulating water

lube oil piping to be independent of other piping systems

two standby auxiliary lube oil pumps be provided

87

Coast Guard Regulations (46 CFR), require main propulsion lube oil systems to be designed to function satisfactorily when the vessel has a permanent .

15 list and a permanent 5Trim

15 list and a permanent 10Trim

22 list and a permanent 10 trim

30 list and a permanent 10 trim

88

Concerning the classification of steam turbines, a cross compound designed unit .

consists of reaction stages and a dummy piston

consists of one Curtis stage and reaction blading

consists of a high pressure turbine, crossover pipe, and low pressure turbine

is made up of a varied assortment of impulse and reaction staging

89

Constant speed governors are normally employed with .

cruising turbines

high pressure turbines

turbo generator units

variable speed turbines

90

Design characteristics of a velocity-compounded impulse turbine include the utilization of .

one or more nozzles with one row of rotating blades

a single pressure stage with two or more velocity stages

a low velocity steam jet from a nozzle

two or more simple impulse stages

91

Despite troubleshooting the system, the watch engineer has been unable to transfer fuel to the settler while underway. As the settler level is becoming dangerously low, the engineer should now .

repeat all the steps he has taken

call out other engineers for assistance

utilize a portable rubber impeller transfer pump

secure each propulsion boiler

92

Dirt and/or metallic particles in a reduction gear lubricating oil system may cause which of the following problems to occur?

Uniform polishing of the journals.

Decrease in lube oil temperature.

Spalling of the gear teeth.

Increase in lube oil discharge pressure.

93

During a maintenance inspection of a turbo generator, the integral turbine wheels are tapped with a hammer. What condition may be indicated by a dull non-resonating sound?

Improper rotor support

Overstressed blade shrouding

A cracked turbine wheel

Normal structural solidity

94

During a maintenance inspection of a turbo generator, the integral turbine wheels are tapped with a hammer. What condition may be indicated by a dull, non-resonating sound?

Normal structural solidity

A cracked turbine wheel

Overstressed blade shrouding

Improper rotor support

95

During an in-port watch onboard a tank vessel while cargo operations are in progress, with the jacking gear engaged and running, you notice a 200 gallon drop in the reduction gear lube oil sump level. Which components or conditions should be checked immediately?

Inspect proper line-up of lube oil service pumps.

Confirm with deck officer that there was a change in vessel trim.

Verify the correct line-up of the lube oil transfer tank gravity overflow line.

All of the above are correct.

96

During an inspection of the main turbine, you notice flow marks or discoloration across the diaphragm joints. This condition indicates .

normal wear for a high temperature unit

water carryover between stages

improper seating of the diaphragm joint

excessive chemical treatment of the boiler water

97

During an inspection of the main turbine, you notice flow marks or discoloration across the diaphragm joints. This condition indicates .

water carryover between stages

normal wear for a high temperature unit

excessive chemical treatment of the boiler water

improper seating of the diaphragm joint

98

During high speed operation of the main turbine propulsion unit, the heat absorbed by the lubricating oil is removed by the .

lube oil purifier

sump vents

distillate cooler

lube oil cooler

99

During maneuvering, a vessel has just proceeded from full ahead to a dead slow condition. Which of the following actions reflects the first response of the gland seal regulator shown in the illustration SE-0004?

Pilot valve "J" would move upward.

Valve "D" would open.

Bellows and connecting link would move upward.

Valve "C" would open.

100

During maneuvering, a vessel has just reached full ahead from a dead slow condition. Which of the following actions reflects the first operation of the gland seal regulator shown in the illustration?

Pilot valve bushing would move downward.

Valve "D" would move upward.

Bellows and connecting link would move upward.

Needle valve would automatically become seated.

101

During normal operation of a main propulsion turbine, the lube oil supply temperature to the bearings should be maintained at approximately .

60F

72F

110F

135F

102

During the operation of a lube oil centrifuge, a thin emulsion interface occurs between the lube oil and seal. The position of this interface is determined by the .

number of disks in the disk stack

outside diameter of the discharge ring

inside diameter of the ring dam

initial volume of seal water admitted to the bowl

103

During the routine inspection of an operating centrifugal lube oil purifier, you notice oil discharging through the water discharge port. Which of the following actions should be taken?

Do nothing as this is normal.

Add water to seal the bowl.

Increase the bowl speed to balance the water and oil discharges.

Decrease the temperature of the entering oil to lower the specific gravity.

104

Excessive priming in a propulsion boiler can cause severe damage to the .

integral superheater

main steam turbine

Both A and B

Neither A nor B

105

Excessive priming in a propulsion boiler can cause severe damage to the . I. integral superheater II. main steam turbine

I Only

II Only

Both I and II

Neither I nor II

106

Excessive priming in a propulsion boiler can lead to severe damage of the . I. downcomers installed in a "D" type boiler II. main steam turbine reduction gears

I Only

II Only

Both I and II

Neither I nor II

107

Excessive thrust bearing wear in a main propulsion turbine rotor should FIRST become apparent by .

rubbing noises when jacking over the main unit

metal particles in the lube oil purifier

an intermittent vibration when changing speed

taking rotor position indicator readings

108

Excessive water in an operating lube oil system can be detected by .

the amount of water discharging from the lube oil purifier

sounding the lube oil settling tank

examining the lube oil strainers

checking oil for unusually low temperature

109

Expansion and contraction of a propulsion turbine casing due to changes in operating temperature, are normally compensated by .

expansion bolts at the base of the steam line

an expansion loop in the exhaust line

supporting the forward end on a deep flexible I- beam

corrugations in the steam chest

110

Failure to use the turning gear prior to warming up a main turbine will damage the .

thrust bearings

gland sealing system

rotor assembly

nozzle located in the diaphragm

111

Fine metallic particles, which may originate from wear or failure of the lube oil service pump internal parts, are prevented from contaminating the bearings served by the lube oil system by .

the settling action of solid matter in the gravity tank

use of the magnetic strainers in the lube oil service pump discharge piping

the change of direction and settling action within the lube oil coolers

batch centrifuging the lube oil at least once a week

112

Flexible couplings used between main turbine rotors and reduction gear installations are usually .

gear type

grid type

flexible claw type

labyrinth type

113

Foaming in a lube oil system can cause .

oil overflow

loss of cooler effectiveness

inadequate lubrication

all of the above

114

For a gravity type lube oil system, a remote pressure sensing device is installed at the point of highest static head pressure on the main unit to enable the watch engineer to . I. be certain that the bearings are being adequately lubricated II. determine if there is sufficient lube oil pressure to the main engine

I only

II only

Both I and II

Neither I nor II

115

For a gravity type lube oil system, a remote pressure sensing device is installed on the main unit lube oil header to enable the watch engineer to . I. determine if there is sufficient lube oil pressure to the main engine II. be certain that the bearings are being adequately lubricated

I only

II only

Both I and II

Neither I nor II

116

For a large main propulsion turbine, the most commonly used turbine thrust bearing is the .

pivoted segmental shoe

overhung turbine wheel

self-aligning shell

self-oiling sleeve

117

For a period of time immediately after being secured, turbines should be rotated slowly to avoid .

damage to the reduction gear teeth

distortion of the rotor shaft

excessive strain on the quill shaft flexible coupling

seizure of the main bearing

118

For the gland seal regulator shown in the illustration (SE- 0019), an increase in gland seal pressure will result in .

piston "F" moving downward to shut the makeup steam valve "B" and open the exhaust valve "E"

piston 'F" moving upward to shut the makeup steam valve "B" and open the exhaust valve "E"

piston 'F" moving downward to open the makeup steam valve "B" and close the exhaust valve "E"

piston "F" moving upward to open the makeup steam valve "B" and close the exhaust valve "E"

119

For the gland seal regulator shown in the illustration SE- 0019, a decrease in gland seal pressure will result in a .

decrease of pressure on the bellows, and the pivot rod will move downward

increase of pressure on the bellows, and the pivot rod will move downward

increase of pressure on the bellows, and the pivot rod will move upward

decrease of pressure on the bellows, and the pivot rod will move upward

120

Fresh water accumulating in the reduction gear sump may be directly attributed to a/an .

inefficient gland sealing system

faulty turbine casing drain valve

lube oil cooler tube leak

fractured main condenser support sheet

121

From the data shown in the illustration, what would be the speed of the L.P. turbine rotor if the propeller shaft was turning at 90 RPM?

1,545 RPM

2,794 RPM

3,947 RPM

4,316 RPM

122

Gear surface failure caused by exceeding the endurance limit of the surface material is characterized by .

initial or corrective pitting

destructive pitting

spalling

All of the above are correct.

123

Gland sealing steam is used during steam turbine operation to prevent the loss of .

oil

air

vacuum

temperature

124

Gland sealing steam is used on propulsion turbines to prevent .

air leakage into the turbine

steam leakage through the casing drains

overheating of the labyrinth packing

reversed steam flow at interstage bleeds

125

Guardian valves are installed on main propulsion turbines to .

prevent steam from leaking into the astern element while the vessel is maneuvering

provide an emergency means of quickly closing the throttle

provide a means to supply steam directly to the astern element of the turbine

prevent steam from leaking into the astern element while at full sea speed

126

Guardian valves are installed on main propulsion turbines to .

prevent steam from leaking into the astern element while the vessel is maneuvering

provide an emergency means of quick throttle closing

provide a means to supply steam directly to the astern element of the turbine

prevent steam from leaking into the astern element at full sea speed

127

Helical gears are preferred over spur gears for reduction gear units due to they fact that they .

prevent torsional stress

eliminate pinion deflection

produce less noise and vibration

be easier to lubricate at high speeds

128

Helical gears are preferred over spur gears for steam turbine reduction gear units due to the fact that they .

prevent torsional stress

eliminate pinion deflection

produce less noise and vibration

be easier to lubricate at high speeds

129

Hot running bearings can be caused by .

inadequate lube oil supply

contaminated lube oil

excessive loading

all of the above

130

How are line shaft bearings usually lubricated?

Gravity feed

Pressure feed

Oil lubricating disks

Oil lubricating rings

131

How is an excess of turbine gland seal steam remedied?

It exhausts to atmosphere.

It drains to the makeup feed tank.

It is directed to the gland exhaust condenser.

It is recirculated via the loop seal.

132

How is the axial clearance indicator used on a turbine?

The axial clearance indicator is inserted in the depth gauge well until it rests on the reference boss, and the reading is noted.

After the axial clearance indicator is screwed into contact with the rotor, shims are placed in the clearance well, and the thickness is measured.

The arm of the axial clearance indicator is pushed so contact is made with the end of the rotor, and the reading on the scale is noted.

A bridge gauge is placed across the bearing, and the gap between bridge and rotor is measured by the axial clearance indicator.

133

How is the lube oil temperature controlled in the pressurized lube oil system shown in the illustration?

Sea water flow through the cooler is adjusted by opening or closing the inlet valve.

A thermostatic valve diverts sea water flow around the cooler.

A thermostatic valve sensor determines temperature downstream of the L.O. coolers and the valve diverts lube oil flow through or around the cooler accordingly.

Lube oil flow through the cooler is adjusted by changing the speed of the lube oil pump.

134

How many Curtis stages are contained in the turbine shown in the illustration?

1

2

3

only a reaction turbine stage is shown

135

How many pinion gears are required in an articulated, double reduction gear set for a cross-compounded turbine?

Two

Four

Six

Eight

136

How many pressure drops occur in the turbine stage shown in the illustration?

One

Two

Three

Four

137

If a higher than normal water level is observed through the inspection port of a flash evaporator, you should suspect .

a leak in the feed water heater

improper vacuum

a malfunctioning brine pump

a clogged desuperheater water strainer

138

If a line shaft bearing begins to overheat, the shaft speed should be reduced. If overheating persists, you should then .

increase lube oil pressure to the bearing

decrease lube oil pressure to the bearing

apply emergency cooling water externally to the bearing

flood the bearing with a higher viscosity oil to provide emergency lubrication and cooling

139

If a lube oil pump fails to build up discharge pressure when first started, the cause could be the .

bypass valve is closed

discharge valve is open

suction pressure is high

shaft packing gland requires adjustment

140

If a lube oil pump fails to build up discharge pressure, the cause could be the .

bypass valve is closed

discharge valve is open

suction vacuum is high

suction valve is closed

141

If a main lube oil pump fails to build up discharge pressure, the cause could be the .

bypass valve is closed

gravity tank is overflowing

discharge strainer magnets have not been cleaned

shaft packing gland requires tightening

142

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

Loss of vessel steering

Overheating of the gyrocompass

Jamming of the six-way valve

Jamming of the follow- up device

143

If a spring bearing begins to run at an abnormally high temperature, you should .

increase the water flow to the main lube oil cooler

immediately stop the shaft to prevent seizing

reduce the shaft speed and supply emergency cooling water to the spring bearing housing

reverse direction of the shaft to flush out the bearing

144

If a tube should leak in an operating main steam turbine lube oil cooler, the water will not immediately contaminate the oil because the .

second-stage discharge valve will open

plug type bypass valve will open

cooling pump would automatically shut off

oil pressure is greater than the water pressure

145

If a turbine bearing high temperature alarm sounds, you should immediately .

increase lubricating oil flow

increase cooling water flow

slow the turbine

stop the turbine

146

If an operating propulsion unit requires excessive quantities of gland sealing steam, you should suspect a .

vacuum leak in the condenser shell

flooded main condenser hot well

worn or damaged labyrinth packing

restriction in the gland leak off piping

147

If contaminated lube oil were allowed to settle undisturbed in a tank, into which layers would the contaminants separate?

Sediment on the bottom, oil in the middle, and water on top.

Sediment on the bottom, water in the middle, and oil on top.

Water on the bottom, oil in the middle, and sediment on top.

Water on the bottom, sediment in the middle, and oil on top.

148

If it should become necessary to abandon a compartment because of the danger of a large steam leak on a boiler, which of the following actions represents the best avenue of escape?

Escape through another compartment on a higher level.

Escape through another compartment on a lower level.

Escape by way of a fire room ladder to the outer deck.

Use fire room elevator to an upper deck.

149

If lube oil pressure to the main turbines is lost while underway at sea speed, the rotor should be stopped immediately. This is accomplished by .

applying the pony brake

tightening the stern tube packing gland

securing all steam to the turbines

admitting astern steam to the turbines after securing ahead steam

150

If saltwater leaks into and contaminates the main lubricating oil system, which of the following remedial actions should be taken?

Locate the leak and seal it off when time permits.

Disengage the jacking gear and allow contaminated oil to cool to engine room temperature.

Run the engines at idle and prevent the circulation of contaminated oil.

Seal off the leak and promptly remove and replace all contaminated oil from the system.

151

If steam is admitted to the main propulsion turbine with the jacking gear engaged, which of the following problems can occur?

Uneven warming of the turbine.

Destruction of the jacking gear.

A possibility of shearing the jacking gear flexible coupling.

Excessive tooth stress on the high pressure first reduction pinion.

152

If the bowl of a centrifugal purifier is improperly reassembled with O-ring seals that have become hard and flat, the centrifuge .

bearings will be permanently damaged

will begin to lose its water seal

will discharge oil to the main sump as dirty as the input

bowl will rotate at a lower speed

153

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

open the auxiliary feed line

blow down the gage glass

replace the gage glass

start the standby feed pump

154

If the gland assembly, shown in the illustration, is located at the forward end of the high pressure turbine, and the vessel is operating at full speed ahead, .

A slight vacuum would exist at "E"

sealing steam would only enter at "F"

sealing steam would enter at "E" and "F" from the LP turbine

this gland would be self sealing and provide sealing steam to the other glands

155

If the gland assembly, shown in the illustration, is located at the forward end of the high pressure turbine, and the vessel is operating at minimum maneuvering speeds, which of the following statements is true?

Sealing steam would enter at "E".

Sealing steam would enter at "F".

Sealing steam would enter at "E" and "F".

This gland would be self sealing and provide sealing steam to the other glands.

156

If the main and standby lube oil service pumps of the main engine fail while underway at sea, .

an emergency supply of oil in the gravity tank will provide time to crash stop the turbine and gears

the reduction gear bearings will immediately fail

the turbine bearings will immediately fail

emergency lubrication can be supplied through the use of the hand pump

157

If the main lube oil pump fails to build up discharge pressure, the reason could be the .

bypass valve is closed

discharge valve is open

shaft packing gland requires adjustment

suction pressure is too high

158

If the main propulsion turbine begins to vibrate severely while you are increasing speed, you should .

open the throttle wider to pass through the critical speed

hold the turbine at that speed until vibration stops

stop the turbine and not answer any more bells

immediately slow the turbine to see if the vibration will stop

159

If the main propulsion turbine speed percentage is increase from 30% to 60%, what percentage of horsepower is required when the new speed is attained as shown in the illustrated graph?

10%

20%

30%

40%

160

If the main turbine bearing lube oil pressure drops to 'zero' and cannot be restored immediately, you should .

notify bridge and crash stop the engine

reduce turbine rotor speed until lube oil sump level returns to normal

reduce turbine rotor speed and pump lube oil with the hand emergency pump

strike down makeup lube oil from the gravity tanks

161

If the rated distillate production of a submerged tube type evaporator cannot be maintained with the supplied maximum steam pressure, the evaporator .

chemical feed must be increased

has a serious brine leak

condenser pressure should be raised

heating surfaces have excessive scale buildup

162

If two turbo-generators with the same no-load speed settings are operating in parallel, the unit whose governor has the lesser speed droop will .

assume the smaller share of the load

assume the larger share of the load

have poor sensitivity characteristics

have poor power response

163

If you are notified that one of the turbine bearings is overheated, which of the following actions should you take first as the watch engineer?

Immediately reduce speed.

Immediately stop the turbine.

Increase lube oil pump discharge pressure and check the strainer for metal particles.

Increase cooling water supply to the lube oil cooler.

164

If you are underway at full speed on a vessel fitted with a main propulsion turbine pressure lubrication system, which of the following actions will be necessary upon complete loss of lube oil pressure?

Slow the main engines and strike down additional oil from the gravity tank.

First close the ahead throttle valve, then open the astern guardian valve, and then open the astern throttle to admit astern steam as quickly as possible.

Secure main steam to the turbines immediately and engage jacking gear.

Secure main steam to the turbines and break vacuum on the main plant immediately.

165

If you hear a 'crackling' sound coming from a salt water centrifugal pump casing, the most probable cause of the noise would be .

insufficient speed

cavitation

excessive discharge pressure

excessive net positive suction head

166

If you hear a 'crackling' sound coming from a salt water centrifugal pump casing, the most probable cause of the noise would be .

insufficient packing

an oversized lantern ring

excessive suction lift

reversed pump rotation

167

Improper operation or faulty main steam turbine components may be indicated by an abnormal variation in .

speed

vibration

noise level

All of the above are individually correct

168

In a cross-compound main propulsion unit, the astern turbine is usually installed at the .

low pressure end of the low pressure turbine

high pressure end of the low pressure turbine

low pressure end of the high pressure turbine

high pressure end of the high pressure turbine

169

In a cross-compounded turbine operating at full load, the total available steam energy is approximately divided between the HP and LP turbine in the ratio of .

1:1

2:1

3:1

4:1

170

In a cross-compounded turbine propulsion plant, steam enters the .

high pressure, intermediate and low pressure units simultaneously

high pressure unit and then flows through a crossover to the low pressure unit

high and low pressure units simultaneously

high pressure unit and then cross-flows to the condenser

171

In a disk type centrifugal purifier, the bowl is mounted on the upper end of the .

worm wheel

radial thrust bearing

bowl spindle

friction clutch

172

In a disk type centrifugal purifier, the contaminated oil enters the centrifuge .

at the bottom through the oil inlet

at the top through the regulating tube

through the neck of the top disk

through the funnel body

173

In a disk type lube oil purifier, heavy impurities collect mostly .

at the bottom of the unit

along the center shaft

at the water discharge

on the inside surfaces of the bowl

174

In a disk type lubricating oil centrifuge .

the centrifuge driving gears are lubricated by the reclaimed oil as it leaves the bowl

all dirt and sludge are discharged with the cooling water

sealing water must never be supplied until after oil is fed to the unit

deterioration of the bowl ring gasket will cause the purifier to lose its water seal

175

In a disk-type purifier which component is used to separate lube oil into thin layers and create shallow settling distances?

A discharge ring

A three-wing device

A tubular bowl

A series of cone- shaped plates

176

In a double articulated reduction gear system, the component labeled "1" would be identified as the ?

high speed pinion

low speed pinion

quill shaft

high speed gear

177

In a double articulated reduction gear system, the component labeled "2" would be identified as the ?

high speed pinion

low speed pinion

quill shaft

high speed gear

178

In a double articulated reduction gear system, the component labeled "3" would be identified as the .

high speed pinion

low speed gear

quill shaft

high speed gear

179

In a double reduction gear, the function of a quill shaft is to provide flexibility between the second reduction pinion and the .

bull gear

second reduction gear

first reduction gear

first reduction pinion

180

In a gravity lube oil system, a sight glass is installed in a line near the operating platform. This line connects the .

bottom of the gravity tank and the lube oil headers

bottom of the gravity tank and the sump

gravity tank overflow and the lube oil headers

gravity tank overflow and the sump

181

In a gravity type lube oil service system, if no lube oil appears in the sight glass (bull's eye) of the return drop line while underway, this is a positive indication that .

no oil is flowing to the bearings

no oil is overflowing from the gravity tank

there is a failure of all lube oil pumps

the gravity tanks are empty

182

In a modern main propulsion turbine installations, lube oil system strainers are usually located in the .

bearing supply line

gravity tank overflow line

pump suction line

gravity tank discharge line

183

In a multistage reaction turbine, the dummy piston and cylinder function to .

counteract rotor axial thrust

dynamically balance the rotating rotor

eliminate the pressure drop across the blades

provide a means of measuring axial clearances

184

In a pressure type main propulsion turbine lubrication system, the lube oil service pumps normally take suction from the main sump and discharge directly to the .

gravity feed tank

lube oil coolers

lube oil header

main thrust bearing

185

In a reaction turbine, the axial thrust due to the reactive force on the rotor blading drives the rotor .

toward the high pressure end

toward the low pressure end

against the dummy piston

toward the diaphragm squealer rings

186

In a reaction turbine, the fixed blades function to .

decrease steam velocity

increase steam velocity

prevent turbulence

produce turbulence

187

In a reduction gear train, a quill shaft of high torsional flexibility provides .

self-adjustment of the pinion gear shaft

rigidity between the elements of the gear train

efficient distribution of oil to the various elements of the gear train

equal distribution of the load among the various elements of the gear train

188

In a segmental pivoted-shoe thrust bearing, the thrust load among the shoes is equalized by the .

base ring

oil wedge

leveling plates

thrust collar

189

In a steam turbine and reduction gear main propulsion plant, the alarm sensor for low turbine oil pressure is usually installed .

at a point on the inlet side of the main bearings as close to the bearings as possible

at a point on the outlet side of the main bearings as close to the bearings as possible

at the outlet of the main thrust bearing

at the end of the supply line header to the bearings

190

In a steam turbine propulsion plant, the source of metal particles adhering to the magnets in the lube oil strainer is probably from the .

turbine shaft journal

turbine bearing shell

reduction gears

bearing babbitt material

191

In a tubular bowl centrifugal purifier, lube oil is rotated at the same speed as the bowl by the .

ring dam

bowl boss

three-wing device

flexible spindle

192

In a tubular-bowl type centrifugal lube oil purifier, any solids separated from the oil are .

discharged with the water

removed through the waste drain

retained in the bowl

solidified on the upper cover

193

In a tubular-bowl type centrifugal lube oil purifier, any solids separated from the oil are .

discharged with the water

removed during the 'shoot' cycle

retained in the bowl

solidified on the upper cover

194

In addition to causing erosion of turbine blades, slugs of water in the steam supply to a turbine driven pump can result in .

thermal shock to the bearings

erratic governor operation

loss of load with resultant turbine overspeed

overheating of the wearing rings

195

In addition to the direction of steam flow, which of the descriptions listed may also be used to classify turbines?

The method in which the steam causes the turbine rotor to rotate.

The type of staging and compounding of steam pressures and velocities.

The division of the steam flow.

All of the above

196

In an impulse turbine, the fixed blades function to .

decrease steam velocity

change the direction of steam flow

equalize pressure differences

prevent steam turbulence

197

In any governor there is a small range of speed in which no corrective action occurs. This speed range is called the governor dead band and is caused by .

friction in the governor linkage and control valve

excessive sensitivity in the governor control valve

speed droop designed into the governor system

speeder spring surge in the governor servomotor system

198

In comparison to a reaction turbine, a steam loss specific to an impulse turbine is known as .

radiation loss

leaving loss

blade and nozzle loss

diaphragm packing loss

199

In herringbone helical gear sets, the tooth contact loading .

is both a sliding and rolling action

is distributed over several teeth simultaneously

is distributed between two opposing helices

all of the above

200

In main propulsion systems, which metal is used in the construction of the shafts for a main reduction gear unit?

Aluminum-bronze

Forged steel

Aluminum

Cast steel

201

In modern reaction turbines, thin tipping is a procedure designed to .

allow for axial expansion

increase blade strength and rigidity

reduce tip leakage

maintain radial clearances

202

In order to maintain the effectiveness of the lube oil centrifuge to remove water, the engineer in charge should .

have the centrifuge cleaned only once every 30 days

take lube oil samples each week and place in clear containers for inspection

maintain the lube oil input temperature at a maximum of 110F

insure that the oil input is always twice the output capacity

203

In order to maintain the required lube oil temperature leaving a lube oil cooler, where an automatic bypass valve is not provided, which of the following operations is correct?

The cooling water to the lube oil cooler is directly regulated to maintain the proper lube oil temperature.

The quantity of lube oil to the cooler is regulated.

The cooling water discharge leaving the cooler is directly regulated.

The lube oil velocity from the cooler is regulated.

204

In order to obtain the best performance with a lube oil purifier, the lube oil inlet temperature should .

never exceed the highest main engine bearing temperature

be equal to the normal lube oil cooler outlet temperature

be equal to main lube oil sump temperature

be maintained in a temperature range of 160F to a maximum of 180F

205

In order to operate the main engine with only the high pressure turbine in service, the unit should be arranged .

to secure only the gland sealing steam to the low pressure turbine

with a blank installed in the high pressure turbine steam inlet

so that the astern turbine is providing approximately one half the output horsepower

with the high pressure turbine exhausting directly to the main condenser

206

In order to reduce the oil clearance between the collar and the astern thrust element shown in the illustration, you would .

increase the thickness of the adjusting ring

decrease the thickness of the adjusting ring

increase the thickness of the filler piece

decrease the thickness of the filler piece

207

In securing the main turbines, steam to the second stage air ejectors should be left on for a short period of time in order to .

dry out the main turbines

insure equal cooling of the main turbine bearings

prevent excessive condensate depression

remove the excessive amount of non- condensable vapors which accumulated during maneuvering operations

208

In some lube oil systems, the temperature of the lube oil downstream from the lube oil cooler is directly regulated by .

a thermostatically controlled valve which bypasses oil around the cooler

the amount of latent heat that the oil carries away from the bearings

the ambient sea water temperature

The operating speed range of the equipment

209

In steam turbine and reduction gear units, lube oil coolers installed in the lube oil system are located between the .

lube oil pumps and gravity tanks

gravity tanks and main unit

gravity tanks and lube oil sump

lube oil sump and lube oil pumps

210

In steam turbine main engine installations, how are the main reduction gear bearings identical to other radial bearings?

They are of the single casting type bearing.

They are babbitt-lined bearings.

They are self-aligning bearings.

They are spherical seated bearings.

211

In the diagrammatic arrangement of the thrust bearing, shown in the illustration, the direction of shaft rotation and the direction of thrust are indicated respectively by arrows .

F and J

F and H

G and J

G and H

212

In the event of failure of the bellows "I" shown in the illustration (SE-0019), .

piston "F" moves upward to open the exhaust valve and close the makeup steam valve.

piston "F" moves upward to close the exhaust valve and open the makeup steam valve

piston "F" moves downward to close the exhaust valve and open the steam makeup valve

piston 'F" moves downward to open the exhaust valve and close the steam makeup valve

213

In the hydraulically operated turbine gland seal regulator, illustrated, the device used as the gland seal pressure sensing unit is called a/an .

bellows

manifold

pilot valve

pivot rods and block

214

In the illustrated device, what would be a reason for oil being discharged from port "N" ?

The device being operated as a clarifier.

The ring dam size is too small.

This would be normal for the operation.

The ring dam size is too large.

215

In the illustrated hydraulically operated turbine gland seal regulator, the exhaust dump valve is closed as a result of the piston being actuated by a/an .

bellows at "I"

spring at "F"

vacuum at "G"

pressure at "A"

216

In the illustration of a hydraulically operated turbine gland seal regulator, the gland seal pressure dump valve is labeled .

E

C

G

A

217

In the illustration of a hydraulically operated turbine gland seal regulator, the gland seal pressure sensing line is labeled .

G

C

D

A

218

In the illustration of a typical ship service turbo generator control system, the device that monitors turbine exhaust pressure is labeled .

K

J

M

F

219

In the illustration of a typical ship service turbo generator control system, the handle labeled "B" is used to .

roll over the high speed pinion

pump up the lube oil manifold

bypass the governor control

reset the overspeed trip

220

In the operation of a lube oil clarifier, the position of the oil- water interface should be .

maintained by the ring dam

maintained by the number of disks in the disk stack

nonexistent

maintained by the diaphragm-type, weir control valve

221

In the thrust bearing assembly illustrated the total oil clearance can be correctly decreased by .

increasing the thickness of the adjusting ring

increasing the thickness of the filler piece

decreasing the thickness of the adjusting ring

decreasing the thickness of the filler piece

222

In the turbine and gear set shown in the illustration, when going astern, the minimum tolerable clearance between the rotor and intermediate or guide blading is .

.025 inch

.070 inch

.090 inch

.150 inch

223

In what classification of steam turbines are the moving blades and the adjacent fixed rows of blades shaped to act as nozzles?

Impulse

Radial flow

Reaction

Helical flow

224

In what positions will the air-operated regulating valves, shown in the illustration, be in when the steam in the gland seal supply line is excessive?

Both valves are open.

Both valves are closed.

The excess steam unloading valve is open and the supply pressure control valve is shut.

The excess steam unloading valve is shut and the supply pressure control valve is open.

225

In which type of turbine does a pressure drop exist through the fixed blades and the moving blades?

Impulse

Reaction

Rateau

Curtis

226

In which type of turbine does the steam pass through reversing chambers machined on the inner surface of the casing, causing the steam to be redirected back to the turbine wheel rim?

Helical flow turbine

Axial flow turbine

Combination axial and radial flow turbine

Cross compound flow turbine

227

Indicated high salinity of the distillate discharged from a flash-type distilling plant will be a result of .

operating at reduced vacuum conditions

carrying the brine level below normal

leaks in the demister baffles

reduced feed water heater temperatures

228

Item "Q" in the illustration is used to .

guide the oil to be cleaned along the inside of the bowl for discharge

balance the force distribution of the three wing device

assist in breaking down surface tension and thereby increase separation of solids and liquids from the oil

establish the position of the three wing within the bowl

229

Journal bearings used with modern turbine rotors are manufactured in two halves in order to .

permit removal of the bearing without removing the rotor from the turbine

facilitate interchanging with other bearing halves

maintain axial alignment and reduce thrust

provide for positive oil flow at all loads

230

Labyrinth packing rings are installed on turbine diaphragms to minimize .

interstage steam leakage along the turbine rotor

air leakage from entering the turbine casing

pressure buildup on both sides of the diaphragm

steam from escaping to the atmosphere

231

Labyrinth seals used to reduce leakage around a turbine shaft are constructed of .

spring bound carbon segments

braided asbestos covered core segments

staged rubber composition seal stripping

machined metallic packing strips or fins

232

Large temperature and pressure drops which occur in the first stage of a combination impulse and reaction turbine are caused by steam passing through .

a nozzle diaphragm in the low pressure end of the turbine

a single row of blades more than once

a dummy piston and cylinder to offset axial thrust

one or more velocity- compounded impulse stages at the high pressure end of the turbine

233

Leakage over the ends of the blade tips, as a result of the pressure differential between each row of blades in a reaction turbine, can be reduced with a blade design known as .

thin tipping

end-tightening

seal stripping

Any of the above

234

Low pressure steam is used to keep air from leaking into turbine casing along the turbine shaft. For this purpose, which of the following steam systems is used?

Direct admission of 35 psi (241.3 kPa) auxiliary steam

Superheated steam system

Gland leakoff steam system

Gland sealing steam system

235

Lube oil cannot be efficiently filtered if its .

viscosity index is too low

temperature is too low

pump discharge pressure is higher than the system pressure

pump capacity is greater than the system's needs

236

Lube oil coolers are necessary in most engine lubricating systems because .

when engine oil is used continuously, the coolers prevent the oil from wearing out

harmful acids need to be condensed before being removed by a centrifuge

they maintain the oils viscosity and film strength while removing the residual heat of the bearings

cooling decreases viscosity and improves engine thermal efficiency

237

Lube oil is preheated before centrifuging in order to .

boil off water

prevent corrosion

reduce friction of the rotating components of the centrifuge

improve purification

238

Lube oil temperature leaving the lube oil coolers is regulated by throttling the .

cooling water inlet valve

cooling water outlet valve

lube oil return flow valve

lube oil outlet valve

239

Magnets are installed in the main propulsion turbine lube oil pump strainers to attract metal particles released through wearing of .

turbine labyrinth

turbine blades

reduction gears

all of the above

240

Magnets are installed in the main propulsion turbine lube oil strainers to attract metal particles released through wearing of the .

reduction gears

turbine blades

babbit bearings

turbine labyrinth

241

Magnets located in lube oil strainers serve to .

remove all metallic particles from the lube oil

remove ferrous metallic particles from the lube oil

remove nonferrous metallic particles from the lube oil

hold the strainer cover in place when removing or installing the cover bolts

242

Main reduction and pinion gears are double helically cut to .

balance axial thrust and reduce vibration

decrease reduction gear radial bearing loads

increase tooth deflection at high speeds

decrease the number of teeth in contact

243

Main reduction and pinion gears are double helically cut to .

reduce end thrust and noise

decrease reduction gear radial bearing loads

increase tooth deflection at high speeds

decrease the number of teeth in contact

244

Main steam turbine bearings are lined with .

babbitt

steel

cast-iron

ferrous oxide

245

Moisture erosion in the last stages of the low pressure turbine will result from .

low inlet steam superheat temperature

an open LP bleed steam valve

an open gland exhaust valve

All of the above are correct

246

Most auxiliary turbine feed pumps do not require an external source of gland sealing steam because they .

operate at relatively low pressures

exhaust to pressures above atmospheric pressure

utilize carbon packing rings at the low pressure end

operate with only a small amount of axial thrust

247

Most auxiliary turbines do not require an external source of gland sealing steam because they .

operate at relatively low pressures

exhaust to pressures above atmospheric pressure

utilize carbon packing rings at the low pressure end

operate with only a small amount of axial thrust

248

Most main propulsion reduction gear bearings are .

self-lubricating, sealed, roller ball type

rigidly mounted, babbit lined, split type

spherical-seated, tapered roller type

self-aligning, solid bushings

249

Most main reduction gear units employ double helical cut gears, rather than single helical cut gears, because double helical cut gears .

eliminate the need for a turbine dummy piston

eliminate the need for spherically seated bearings

prevent unequal tooth contact

operate without significant axial thrust

250

No lube oil appearing in the sight glass (bull's eye) of a gravity type system is a positive indication of .

no oil flowing to the bearings

no oil is overflowing the gravity tank

failure of all lube oil pumps

the gravity tanks being empty

251

No lube oil appearing in the sight glass (bull's eye) of a gravity type system is a positive indication of .

no oil flowing to the bearings

no oil overflowing in the gravity tank

oil drop line is closed

the gravity tanks being empty

252

Nozzle diaphragms are installed in pressure-compounded impulse turbines to .

support moving blades

support shrouding

hold the nozzles of the stage and admit steam to moving blades

eliminate blade and nozzle losses

253

Of the many impurities commonly found in marine lubricating oil, which of the following CANNOT be removed by a centrifugal purifier at normal operating speeds and temperatures?

Water

Carbon particles

Diesel fuel oil

Metal particles

254

Oil discharged from the illustrated device has a milky-white appearance which is due to .

proper operation of the centrifuge

insufficient tension being maintained by "H"

excessive tension provided by "Q"

slightly worn item "V"

255

Oil flowing through the sight glass in the line between the lube oil gravity tank and main sump indicates the .

gravity tank is overflowing

lube oil pump is stopped

lube oil suction strainer is clogged

lube oil sump is full

256

Oil supply pressure to the main lube oil header of a gravity feed lube oil system is .

the result of the height of the gravity tank above the manifold

the sum of the lube oil static head pressure and service pump discharge pressure

the difference between the lube oil static head pressure and service pump discharge pressure

equal to the service pump discharge pressure, since the static heads of the lines to and from the gravity tank cancel out one another

257

On a main propulsion turbine bearing, the readings obtained with a bridge gage represent the .

oil clearance and bearing wear

babbitt thickness

diaphragm tip clearance

blade axial clearance

258

On a ship equipped with a gravity type lube oil system, which of the conditions listed will occur FIRST if the main lube oil pump discharge pressure is lost?

All bearing oil pressure will be lost.

An alarm will sound.

The astern throttle will immediately open.

Lube oil will be provided to the bearings and gears via the gravity tank overflow line.

259

On a steam vessel, if a centrifugal main feed pump were operating at shutoff head with the recirculating line closed, which of the following conditions could occur?

Water level in the DC heater would decrease.

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.

260

On an fully automated vessel steaming at sea speed, which of the following engine room responses will automatically be actuated when the bridge throttle control is changed from full ahead to slow ahead?

Main turbine extraction valves will open.

Scoop injection valve will open.

Main condensate recirculating valve will open.

First-stage feed water heater will be bypassed.

261

On main turbine propulsion units, gear type flexible couplings are generally used between the .

rotor shaft and pinion shaft

rotor shaft and quill shaft

quill shaft and high speed pinion

second reduction and the shaft thrust bearing

262

On watch aboard ship, which of the following conditions will prevent a general service shipboard pump from achieving its maximum suction lift?

Leaks developed in the suction piping.

Restriction in the suction line.

Gases or vapors released in the liquid as a result of greater than normal pressure drops.

All of the above.

263

One cause for unusually low lube oil service pump pressure may be due to .

low sea water temperature

excessively high lube oil temperature

wasted lube oil cooler zincs

all of the above

264

One function of the disks, in a disk-type centrifugal purifier, is to divide the bowl space into many separate passages to .

minimize agitation of the oil-water mixture

increase hydraulic head needed for proper circulation

completely filter out suspended particles

prevent bowl spindle vibration

265

One limiting problem of lube oil filters restricting their use in large lube oil systems is .

they easily rupture at normal working pressures

as the oil temperature fluctuates during load changes their effectiveness changes inversely to the temperature

the associated large pressure drop across the filter

the need to centrifuge the oil in addition to the use of the filter

266

One method of securing shroud bands to the ends of the turbine blades is to .

stiffen the blades to reduce vibration

increase blade resistance to moisture in steam

assist in maintaining radial clearances

strengthen the blade root fastenings

267

One of the most effective methods of improving purification in tubular and disk type centrifugal purifiers is to .

decrease the viscosity of the oil by heating

increase the pressure at which the oil is fed through the purifier

match the discharge ring size outside diameter with the lube oil's specific gravity

use the smallest inside diameter of the discharge ring size without a loss of oil with the discharge water

268

Operating a steam turbine propulsion unit at medium speed, in an area with extremely cold seawater and the main circulating pump providing full cooling water flow to the condenser will result in .

excellent plant efficiency due to higher attainable vacuum

increased plant efficiency due to increased condensate depression

increased effectiveness of the air ejectors due to the increased main condenser vacuum

increased condensate aeration due to the inability of the air ejectors to remove excessive air accumulation from the condenser

269

Operating a steam turbine propulsion unit at medium speed, in an area with extremely cold seawater, and the main circulating pump providing full cooling water flow to the condenser will result in .

decreased plant efficiency due to higher attainable vacuum

increased plant efficiency due to increased condensate recirculation

reduced plant efficiency due to excessive condensate depression

increased effectiveness of the air ejectors due to the increased main condensate temperature

270

Operating a steam turbine propulsion unit at reduced speed, in an area with extremely cold seawater, with the main circulating pump providing full cooling water flow to the condenser will result in .

decreased plant efficiency due to higher attainable vacuum

decreased plant efficiency due to increased condensate depression

a decreased requirement for gland sealing steam

increased plant efficiency due to increased condensate depression

271

Packing rings installed on auxiliary turbines are generally lubricated by .

separate lube oil lines

a water leak off line

moisture in the turbine steam

a salt water service line

272

Precautions to be observed prior to starting a turbine driven cargo pump, should include .

assuring that the turbine casing drains are wired closed

observing the operation of the overspeed trip

open all governor oil relay drains

checking the manual trip device for proper operation

273

Prior to relieving the watch at sea, you notice black smoke coming from the stack. What would this indicate?

Insufficient excess air

Dirty burner

Soot blowers need to be operated

All of the above

274

Prior to relieving the watch you should first check the fire room status by verifying the boiler water level and .

prepare to blow tubes

economizer inlet temperature

boiler steam pressure

port and starboard settling tanks

275

Prior to relieving the watch you should first check the fire room status by verifying the boiler steam drum level and .

inspecting the fires and burners

preparing to blow tubes

stack temperature

port and starboard settling tank levels

276

Prior to relieving the watch you should first check the fire room status by verifying the boiler steam drum level and .

lube oil temperature

fuel pressure to the burners

water drum level

steam atomization temperature to the mechanical atomizers

277

Prior to relieving the watch you should first check the fire room status by verifying the boiler water level and .

steam atomization pressure to the mechanical atomizers

fuel pressure to the burners

fuel oil viscosity

water drum level

278

Prior to relieving the watch you should first check the fire room status by verifying the fuel oil pressure to the boilers and .

boiler steam pressure

make up feed tank level

prepare to blow tubes

port and starboard settling tanks

279

Prior to relieving the watch you should first check the fire room status by verifying the fuel oil pressure to the burners and .

DC heater temperature

prepare to blow tubes

check port and starboard settling tanks

boiler water level

280

Prior to rolling the main turbines in preparation for getting underway, you should .

secure the gland sealing steam regulator

open the reduction gear casing access plates and inspect the lube oil spray pattern

circulate the lube oil through the emergency lube oil cooler

disengage the turning gear

281

Prolonged astern operation of a turbine will cause .

overheating of the stern gland

overheating of the ahead stages

improper functioning of the air ejectors

loss of suction at the condensate pump

282

Proper vacuum must be maintained during prolonged astern operation to .

eliminate leaving loss in the ahead blading

minimize any appreciable amount of condensate depression

ensure proper action of the condenser sentinel valve or back pressure trip

minimize heat buildup in the ahead stages

283

Raising vacuum on a main turbine unit without using the turning gear will result in .

uneven heat distribution in the rotor unit

excessive time being required to raise vacuum

scoring of the rotor in way of the labyrinth packing

overheating of the second-stage air ejector

284

Reduction gear bearing bridge gage readings should be taken after .

rotating the journal to the point of minimum oil clearance

all bearing caps and all bearing halves are removed

rotating the bearing shell so that the point of maximum bearing wear is directly at the bottom

All of the above are correct.

285

Reduction gears for main propulsion turbines are lubricated by .

grease cups and gravity feed lines

oil flinger rings mounted on the shaft

leak off lines from the lube oil cooler

spray nozzles at the gear meshing points

286

Reduction gears on main propulsion turbines are double helical cut to .

reduce torque

eliminate gear tooth thrust

increase pinion deflection

reduce the size and weight of the bull gear

287

Regarding main propulsion boilers, what condition would normally be indicated if the bridge reported that white smoke was observed coming from the stack?

high fuel oil viscosity

too much excess air

low fuel oil temperature

insufficient steam atomization pressure

288

Regarding main reduction gears, when high speed first reduction pinions and gears are connected to low speed pinions and gears, each contained in a sequential portion of the gear housing, the reduction gear unit is known as .

nested

locked train

articulated

none of the above

289

Regarding the bearing shown in the illustration, "X" represents the .

template used for bearing offset

lower bearing half

upper bearing half

vacated bearing shell space

290

Regarding the governor shown in the illustration, what would occur as the result of a speed increase by a ship's service turbo generator?

The governor weights will move inward.

The lifting beam is raised.

The pilot valve is lowered.

Oil is pumped into the operating cylinder.

291

Rotating flyweights acting against a spring force makes up a simple type of .

governor

reducing valve

safety valve

feed water regulator

292

Rotating flyweights, acting against a spring force, will provide a simple type of .

feed water regulator

safety valve

governor

reducing valve

293

Rotor axial thrust developed in a reaction turbine is the result of a steam pressure drop across .

the nozzles

the stationary blades

the moving blades

both the moving and stationary blades

294

Salinity cells are strategically installed in distilling units to indicate the .

quantity of the distillate produced

quality of the distillate produced

presence of leaks in the flash chambers

all of the above

295

Shrouding on impulse turbine blading is held in place by .

seal welding

circumferential dovetails

peening the tenons

locking keys

296

Shrouding, with regards to steam turbines, is rolled to the curvature of the blade ends and fitted to the blade .

roots

tenons

seal strips

dovetails

297

Sliding contact bearings are classified into two general categories: journal bearings and .

radial bearings

needle bearings

thrust bearings

roller bearings

298

Sludge tanks are used in an oil lubricating system to receive .

makeup oil that is to be added to the system after settling

foreign liquid matter, discharged from the lube oil purifier or the stripping pump

bilge slops that can be reclaimed after clarification

all of the oil that passes through the lube oil coolers

299

Standing watch in the engine room, a high reading is only indicated at the salinity cell labeled "6" shown in the illustration. This would be the probable result of .

a minor tube leak in the distillate condenser in section III

a faulty cell at this location

the compensating temperature is set too low for this cell location

All of the above

300

Steam passing through a multistage impulse turbine does not impart any appreciable axial thrust to the rotor. This is primarily due to the .

pressure drop taking place through the moving blades

dummy piston and cylinder arrangement

equalizing holes provided in the turbine wheel

steam velocity decreasing through the nozzle diaphragms

301

Steam supplied to the main propulsion turbines is .

saturated steam

superheated steam

desuperheated steam

wet steam

302

Tenon peening is a technique employed by turbine manufacturers to .

minimize turbine rotor axial thrust

secure shroud bands to turbine blading.

balance the turbine rotor assembly

secure turbine blading to the rotor

303

The adjustable spherically seated self-aligning bearing housings used in main turbines are provided with oil deflector rings. The function of these rings is to .

ensure efficient lubrication of the bearing

prevent the leakage of main steam into the oil

prevent the external leakage of oil out of the bearing housing

direct the flow of oil through the bearing

304

The astern element of a main propulsion turbine is usually designed as a/an .

multiple entry, helical flow turbine

single entry, double flow turbine

Curtiss stage, impulse turbine

Parsons stage, reaction turbine

305

The astern guarding valve on main propulsion steam turbine units must be open when a vessel is .

at full sea speed

maneuvering into port

running with a warm bearing

loading cargo

306

The axial position of a turbine rotor is controlled by the thickness of the .

thrust bearing collar

thrust bearing filler piece

journal bearing shims

labyrinth packing fins

307

The axial position of a turbine rotor is normally adjusted by varying the thickness of the .

thrust bearing shoes

journal bearing shims

labyrinth packing fins

thrust bearing filler piece

308

The base ring shown in the illustration is identified by the letter .

A

C

D

E

309

The best indication that a bearing is being properly lubricated is by the .

oil pressure at the lube oil pump discharge

lube oil strainer condition during cleaning and inspection

oil temperature indicated by the bearing thermometer

oil temperature leaving the lube oil cooler

310

The bulk of the solid material entering a centrifugal purifier with lube oil is .

discharged with the water

trapped in the bowl

trapped in the filter

forced out the overflow

311

The component labeled "II", as shown in the illustration, is called the .

first reduction gear

high speed pinion

second reduction gear

second reduction pinion

312

The component shown in the illustration, labeled "I", is the .

first reduction gear

first reduction pinion

second reduction gear

second reduction pinion

313

The component shown in the illustration, labeled "III", is the .

first reduction gear

high speed pinion

second reduction gear

low speed pinion

314

The component shown in the illustration, labeled "IV", is the .

first reduction gear

high speed pinion

bull gear

low speed pinion

315

The components in a Kingsbury thrust bearing assembly that are responsible for transmitting an equal thrust load to all the shoes are called the .

Leveling plates

Inner raceways

Outer raceways

Base rings

316

The constant pressure governor of a turbine-driven feed pump maintains which of the following pressures at a constant value for all capacities?

Turbine inlet

Turbine exhaust

Pump suction

Pump discharge

317

The correct radial clearances between the rotor and the casing in a propulsion turbine are maintained by the turbine .

interstage packing

thrust bearing

diaphragms

journal bearings

318

The designed function of fixed blades in an impulse turbine is to .

prevent steam turbulence

decrease steam velocity

equalize pressure differences

change the direction of steam flow

319

The diameter of a dummy piston installed in a reaction turbine is determined by .

rotor design and the amount of thrust to be counteracted

steam temperature and design RPM

the length and diameter of the equalizing line

the volume of the exhaust trunk and pressure drop over the last stage

320

The dirty oil inlet on centrifugal lube oil purifiers is located at the .

top of the tubular bowl type

bottom of the tubular bowl type

top or bottom of the disk type depending upon whether the unit is to be operated as a separator or clarifier

bottom only of the disk type

321

The disassembled thrust bearing, shown in the illustration, which of the listed parts is labeled "I"?

Base ring.

Leveling plates.

Thrust shoes.

Collar.

322

The disk stack and tubular shaft used in a lube oil centrifugal purifier, is forced to rotate at bowl speed by .

the use of an acme thread screw

wire springs

the locating pin

the drive pin

323

The distilled water tank has been determined to be 75% full. The tank connection to the pneumercator has been disconnected for a maintenance check. If the pneumercator operates correctly, the gage should indicate .

a value equal to three fourths of the actual level

a false high reading possibly permitting the entry of air into the system

the minimum value display along the provided scales

the absence of mercury in the system

324

The factor which determines the minimum amount of steam superheat required at the steam chest inlet of a main propulsion turbine is the .

horsepower of the turbine

vacuum in the condenser

moisture content in the steam at the LP end of the turbine

specific volume of the steam in the low pressure end of the turbine

325

The FIRST adverse effect resulting from main bearing wear in an impulse turbine is .

wear of radial dummy piston packing strips

wear of gland seal and diaphragm labyrinth packing

loosening of bearing cap bolts

lower steam exhaust temperatures

326

The FIRST step in breaking vacuum on a main turbine unit should be to .

secure the steam to the main air ejector

secure the steam to the gland seal system

stop the main circulating pump

stop the main condensate pump

327

The following information was recorded after a recent L.P. turbine bearing installation. The bearing temperature was logged at the indicated time intervals as: 1200-110F(43C) 1210-123F(51C) 1220-136F(58C) 1230-149F(65C) 1240-153F(67C) 1250-155F(68C) 1300-155F(68C) The shaft RPM and lube oil cooler outlet temperature remained constant. The readings indicate .

normal temperature during wear in

water in the lube oil system

wiping of the bearing material

excessive bearing preload conditions

328

The function of a quill shaft used on a double reduction gear main propulsion unit is to .

allow for gross radial misalignment of the high- speed pinion

reduce backlash in the reduction gear

allow for flexibility between the high-speed pinion and first reduction gear

allow for axial flexibility between the first reduction gear and second reduction pinion

329

The general method of reducing turbine reaction blade vibration is by the use of .

binding wire

casing seal strips

casing diaphragms

dummy pistons

330

The gravity tank in a gravity lube oil system serves to .

store heated lube oil

supply the lube oil service pump with a positive suction head

settle lube oil prior to purifying

maintain oil supply for several minutes to bearings should the lube oil service pump fail

331

The intermediate pressure bleed steam system, shown in the illustration, is used to supply steam at approximately .

35.0 psig

13.6 psig

13.6 psia

67.0 psig

332

The item shown in the illustration is commonly identified as a .

machine shop lathe attachment

machine shop milling machine attachment

disk type purifier

bowl type purifier

333

The jacking gear is used in preparation for starting a marine turbine and reduction gear unit to .

allow the rotor to cool evenly

allow a film of oil to form on the spring bearings

prevent the gland seal steam from distorting the rotor

listen for rubbing noises from the gland seal condenser

334

The jacking gear must be engaged as quickly as possible when securing the main turbines in order to .

permit rapid cooling of the reduction gears

prevent uneven cooling of the turbine rotors

maintain a constant supply of lube oil to the main unit

prevent the stern tube bearing from overheating

335

The jacking gear on main propulsion turbines can be used to .

provide propulsion in emergencies

provide reduction gear tooth inspection

reduce turbine speed during maneuvering

lift the reduction gear casing

336

The jacking/turning gear mechanism of a main propulsion geared turbine installation is normally connected through mechanical linkage to the .

low speed gear rotor

bull gear

low speed pinion rotor

high speed pinion rotor

337

The Kingsbury bearing is equipped with pivoted shoes in order to .

absorb radial stress

compensate for shaft misalignments

keep the sleeve from turning

maintain a wedge- shaped oil film

338

The labyrinth packing ring in an interstage diaphragm of an impulse turbine is prevented from rotating by .

a horizontal key joint extending into a slot

spring tension exerted on retaining rings

steam pressure exerted on the packing segments

the weight of the diaphragm acting on the packing ring

339

The labyrinth seals used on rotating steam turbine shafts reduces external leakage by causing .

successive pressure drops through the seal stages

successive temperature drops through the seal stages

pressure increases through successive seal stages

increased turbulence through successively larger labyrinth clearances

340

The level of the contaminated drain inspection tank continually decreases when steam is admitted to a fuel oil double bottom tank. You can expect .

a plugged heating coil

higher than normal return temperatures

a leaking makeup feed regulator

a perforated heating coil

341

The level of the drain inspection tank continually decreases after steam is admitted to a double bottom tank fuel oil heating coil. You can expect .

proper heating of the fluid

higher than normal temperatures

a leaking makeup feed regulator

a perforated heating coil

342

The lube oil coolers installed in a gravity lubricating oil system are located between the .

lube oil pumps and gravity tanks

gravity tanks and main units

gravity tanks and lube oil sump

lube oil sump and lube oil pumps

343

The main propulsion shaft turning gear usually connects to the free end of the high-speed high pressure pinion because the .

lubricating oil from the high-speed pinion can easily supply the turning gears

turning gears are double reduction worm type and cannot mate with the low pressure high-speed pinion

arrangement allows for the use of a muff type coupling for flexibility and smooth engagement

greatest gear ratio between the turning gear motor output and bull gear can be obtained

344

The main propulsion turbine can be damaged by .

operating at slow speeds

water carryover from the boilers

maintaining vacuum too high

using the jacking gear when there is no vacuum

345

The main propulsion turbine should be operated with the .

lowest practical chest pressure and the minimum number of nozzles required to maintain the desired speed

lowest practical chest pressure and the maximum number of nozzles possible to maintain the desired speed

highest practical chest pressure and the minimum number of nozzles required to maintain the desired speed

highest practical chest pressure and the maximum number of nozzles possible to maintain the desired speed

346

The main throttle valve on a main propulsion turbine admits steam directly into the .

nozzle diaphragm

turbine blades

turbine steam chest

crossover connection

347

The main turbine gland sealing system is designed to .

seal the turbine shaft against air leakage into the turbine casing

allow minimal steam leakage out of the gland

regulate steam pressure to the glands when the main turbine is operating at reduced speeds

all of the above

348

The maintenance of reduction gear units is principally concerned with attention to keeping the .

reduction ratio constant between the speed of the turbine and the speed of the driven element

upper half of the gear casing secured to the lower half

gears supplied with clean oil at the proper operating pressure and temperature

drive gears aligned with drive shaft

349

The maximum lube oil temperature leaving a large, main propulsion steam turbine bearing should .

be always maintained at 130 F

never exceed 170F

never exceed the inlet temperature by more than 70F

not exceed the normal lube oil outlet temperature from the centrifugal purifier

350

The maximum lube oil temperature leaving the lube oil cooler of a main steam turbine propulsion system should .

be about 180F

never be more than 60F below the lube oil inlet temperature

never exceed 130F

be dictated only by the existing sea water temperature

351

The maximum temperature rise of oil passing through any reduction gear set, or bearing, should not exceed .

30F (16.7C)

50F (27.8C)

70F (38.9C)

90F (44.5C)

352

The maximum, safe, upper limit temperature of lubricating oil discharged from the purifiers is .

150F

160F

170F

180F

353

The most critical period of main turbine operation is during cold start-up, rather than hot shutdown because .

lubricant film thickness during start-up is considerably less than the dimensions of gear surface irregularities

differential expansion can result from the temperature difference between the rotor and rotor casing

the danger of blade erosion damage from dry steam impingement is greater during start-up

harmonic vibrations associated with critical speed can easily be reached during start-up

354

The most likely result of water slugging in the steam supply to a ship service turbo generator is .

excessive shaft seal wear

contamination of the lube oil

damage to the turbine blades

rapid erosion of labyrinth packing

355

The normal characteristics and properties of lube oil will begin to break down if contaminated with water and .

allowed to stand idle

thoroughly agitated

thoroughly centrifuged

discharged at a higher pressure

356

The original bridge gage reading for a reduction gear bearing was measured as .008 inches. A year later, the bridge gage reading for the same bearing is .010 inches. This indicates .

bearing wear is .010 inch

oil clearance is .002 inch

bearing wear is .002 inch

oil clearance has increased .010 inch

357

The overspeed tripping device installed on an auxiliary turbine is automatically actuated by .

pneumatic force

hydraulic pressure

high back pressure

centrifugal force

358

The part shown in the illustration would be located between which of the following components of a modern geared turbine main propulsion unit?

Between the bull gear and line shaft on the thrust bearing side of the gear.

Between the bull gear and line shaft on the side of the gear opposite the thrust bearing.

Between the first reduction gears and high- speed pinions of the high pressure and low pressure turbines.

Between the rotors and high-speed pinions of the high pressure and low pressure turbines.

359

The pinion gears used in main propulsion reduction gear mechanisms are generally constructed of .

aluminum

bronze

forged steel

cast steel

360

The pressure drop existing across the diaphragm of a pressure compounded impulse turbine necessitates .

installation of a dummy piston and equalizing line to reduce thrust

installation of a diaphragm packing seal to minimize interstage leakage

circumferential dovetailing to secure the rotor blades

Seal stripping the tips of the turbine blades

361

The pressure drop that occurs across both the moving and fixed blades of a reaction turbine is the result of the .

reversing blades causing a velocity drop with resultant pressure drop

conversion of the thermal energy to pressure energy always resulting in a pressure drop

interstage diaphragms creating a nozzle effect in the steam flow

moving and fixed blades being shaped to act as nozzles

362

The proper oil inlet temperature for centrifuging lube oil should be .

100 to 120F (37.8 - 48.9C)

130 to 150F (54.4 - 65.5C)

160 to 180F (71.1 - 82.2C)

190 to 210F (87.7 - 98.9C)

363

The purpose of a thrust bearing, mounted between the engine and the propeller of a steam plant power train, is to .

dampen torsional vibrations

transmit propeller thrust to the hull

maintain crankshaft radial alignment

absorb gear thrust in double helical gears

364

The purpose of oil deflector rings for turbine shafts include .

directing the lube oil spray

preventing oil leakage along the shaft

forming the lube oil spray pattern

removing emulsified lube oil from the sump

365

The purpose of shroud bands secured to the tips of the turbine blades is to .

stiffen the blades to reduce vibration

increase blade resistance to moisture in steam

assist in maintaining radial clearances

strengthen the blade root fastenings

366

The purpose of the main reduction gears is to .

transmit vibration and thrust to the ship's hull

reduce high turbine RPM to an efficient propeller RPM

reduce engine room noise levels during high speed operations

provide a means of reversing the main engines in an emergency

367

The purpose of the reaction turbine dummy piston is to .

counteract and balance axial thrust produced by the turbine rotor

act in conjunction with gland seal steam to balance turbine thrust

assist in maintaining radial clearances

eliminate radial thrust caused by the pressure increases in the turbine stages

368

The purpose of the sentinel valve installed on a turbine casing is to .

warn the engineer of back flow of steam from the exhaust trunk

warn the engineer of excessive pressure in the low pressure turbine casing

relieve excess pressure to the turbine extraction points

vent excess steam to the main condenser

369

The reduction gear shown in the illustration is a/an .

nested double reduction gear

nested four-step reduction gear

articulated double reduction gear

locked-train double reduction gear

370

The reversing turbine is normally used for which of the following operations?

Emergency stopping

Backing

Maneuvering

All of the above.

371

The rotating speed of the tubular bowl centrifuge is more than twice that of the disk type. The reason for this is .

a narrow diameter bowl is not effected as much by windage losses as a larger diameter bowl

the friction affecting rotation is not as significant with a narrow diameter bowl

the drag bushing is used to permit the higher speed of rotation

to produce a nearly equal magnitude of centrifugal force

372

The safety device provided on a turbo generator which closes the throttle automatically when the cooling water to the condenser is insufficient is called a/an .

back pressure trip

low pressure trip

high temperature trip

overspeed trip

373

The sample of oil discharged from the device illustrated appears milky white, and is probably due to .

normal operation

worn or bad bearings in "C"

weaken spring below "V"

position of "P" is too high in the bowl

374

The size of the discharge ring used in a lube oil purifier is determined by the oil's .

viscosity

moisture content

sediment content

specific gravity

375

The slight wavy appearance of the tips of reduction gear teeth is a result of .

insufficient lube oil pressure

high lube oil temperatures

the method of manufacture and does affect normal operation

uneven bearing wear due to gross misalignment

376

The source of metal particles adhering to the magnets in a lube oil strainer is probably from the .

shaft journal

bearing shell

reduction gears

babbitt material

377

The splits located in the halves of main reduction gear bearings are aligned at an angle to the horizontal in order to resist .

oil loss

steam loss

axial stress

wiping

378

The steady frequency required from a ship service generator for electrical power is maintained by means of a .

throttle control mechanism

constant speed governor

speed limited governor

cam operated nozzle control valve

379

The temperature of emulsified lubricating oil entering a purifier from a preheater should range between .

110-120F

140-150F

160-180F

190-210F

380

The term 'separation' as used in oil purification refers to the removal of .

water from a mixture of oil liquids

solids from lube oil

acid contaminants from oil

oil from its additives

381

The three wing device in the unit illustrated is maintained in its position by item .

O

P

Q

R

382

The three wing device in the unit illustrated is maintained in its position by item .

B

P

Q

R

383

The three-wing device used in the tubular bowl purifier, is held in place and forced to rotate at bowl speed by the .

vertical shallow grooves machined into the bowl surface

flexible wire springs secured to the edge of each 'wing'

locating pin pressed into the top edge of the three- wing device

drive pin pressed into the interior surface of the bowl

384

The thrust bearing wear on a turbine may be determined by checking the .

bearing drop

rotor axial position

rotor expansion rate

casing movement

385

The turbine of a turbo-electric drive should be secured by .

closing the main steam stops

dynamic braking of the generator

tripping the throttle trip by hand

closing the throttle by hand

386

The type of turbine shown in the illustration is a .

velocity-compounded impulse turbine

pressure-compounded impulse turbine

pressure-compounded reaction turbine

combination impulse and reaction turbine

387

The type of turbine shown in the illustration is classified as a .

pressure-compounded impulse

velocity-compounded impulse

pressure-velocity compounded impulse

pressure-compounded reaction

388

The usual symptoms of cavitation in a centrifugal pump would be .

noise and vibration

an increase in discharge pressure

an increase in suction pressure

lifting of the relief valve

389

The valve opening sequence for bar-lift nozzle control valves in a marine steam turbine is determined by .

the turbine idle speed

pilot valves which initiate movement of each individual valve bar

the distance between the top of the bar and the adjusting nuts on the valve stems

electro-hydraulic servomotors attached to individual valve stems

390

The vessel is currently operating at sea. Despite troubleshooting the system, the engineers of the vessel have been unable to transfer fuel to the settler. As the settler level is becoming dangerously low, they should now .

repeat all the steps they have taken

call out all hands for assistance

utilize a rubber impeller portable pump

reduce the vessel's speed and other plant loads

391

The water seal in a centrifuge, operating at normal speed, prevents the lube oil from discharging from the water outlet. Another function of the seal is to .

develop permanent emulsions with the lube oil

provide a means of 'washing' the oil as it passes through the bowl

keep the bowl at a temperature below that of the lube oil input

provide an area for separated water to pass and create a path to remove the water from the bowl

392

The water seal used in a tubular bowl centrifugal purifier is kept in the bowl during normal operation by .

an inclined port or passage rising from the bowl side towards the center

an inclined port or passage rising from the center towards the bowl side

baffled orifice

top cover

393

Thin tipping is a type of turbine blade design primarily used to .

increase the effective blade surface area without increasing blade weight

prevent any pressure drop from occurring through the moving blades in an impulse turbine

provide a means for mounting the shrouding on the blade tips

reduce losses due to blade tip leakage in reaction turbines

394

Thrust bearings are installed in main propulsion turbines to .

cancel centrifugal thrust force

control rotor axial movement

eliminate the need for dummy piston

maintain radial clearances

395

Thrust clearances indicated on a main propulsion turbine bearing clearance diagram are .

normal clearances for operation under routine steaming conditions

cold clearances to which the bearing was initially set

minimum clearances that indicate when bearing renewal is necessary

maximum clearances which should not be exceeded when the turbine is warmed up

396

To accurately measure the amount of wear on a high speed pinion journal bearing with a bridge gage, you must .

be sure that the area of greatest wear is at 90 to the measuring pin

shift the journal to position the pinion off center in the bearing

raise the journal to a height equal to the oil clearance

roll the bearing shell until the wearing zone is at the bottom

397

To assure the main propulsion turbine bearings are receiving the proper lube oil supply, you should check the .

bull's-eye in the gravity tank overflow

lube oil temperature at the cooler outlet

flow through the sight glass at the bearing

lube oil strainer magnets

398

To determine the extent of lube oil system contamination you would .

watch for variations in the lube oil pump discharge pressure

observe the oil flow in the sight glasses

inspect the purifier for separated foreign matter

maintain a close watch on bearing temperatures

399

To minimize axial thrust in an impulse turbine, equalizing holes are located .

between the steam inlet and the front of the dummy piston

between the exhaust outlet and the front of the dummy piston

in each casing diaphragm

in each rotor wheel

400

To prevent damage to the turning gear mechanism, which of the following procedures must be carried out before the turning gear is engaged?

The brake on the first reduction worm shaft must be set.

The propeller shaft must be stopped and held stationary until the clutch is engaged.

The engine order telegraph must be on 'stop'.

The speed of the astern turbine must be reduced.

401

To properly sound a reserve feed water tank, you should use a/an .

innage sounding tape

chalk coated calibrated metal rod

manila line with an attached weight

fuel oil settler ullage tape

402

To raise vacuum on the main turbine unit, you should .

start the lube oil pump after starting the jacking gear

warm up and drain the main steam lines

pump the main condenser hot well dry

admit gland sealing steam to the turbine glands

403

To stop the rotor of a main turbine while underway at sea you should .

apply the prony brake

tighten the stern tube packing gland

secure all steam to the turbine

admit astern steam to the turbine after securing the ahead steam

404

To test an automatic low lube oil pressure trip on an idling turbo generator and at the same time prevent the chance of bearing damage, you should .

secure the steam supply valve to the throttle valve and observe the lube oil pressure reading when the throttle trips, while ensuring an adequate supply of oil with the hand or standby pump as the generator idles to a stop or drops below 3 psi .

ensure the standby lube oil pump, if so equipped, is properly lined up and set in the "auto" mode, or the hand pump is being operated and then actuate the emergency trip

close the generator steam throttle valve and then ensure a supply of oil through the hand or standby pump when the pressure drops to 5-6 psi .

actuate the overspeed trip, making a note at what pressure the oil is dumped from under the operating piston

405

To test an automatic low lube oil pressure trip on an idling turbo generator and at the same time prevent the chance of bearing damage, you should .

actuate the overspeed trip, making a note at what pressure the oil is dumped from under the operating piston

close the generator steam throttle valve and then ensure a supply of oil through the hand or standby pump when the pressure drops to 5-6 psi

secure the steam supply valve to the throttle valve and observe the oil pressure as the throttle trips during the slowdown and ensure a supply of oil with the hand or standby pump when the pressure drops to 2-3 psi

ensure the standby lube oil pump, if so equipped, is properly lined up and set in the 'auto' mode, or the hand pump is being operated and then actuate the emergency trip

406

Turbine blade erosion is accelerated by .

high blade speed

high moisture content

high vacuum

all of the above

407

Turbine casing flanges are sometimes provided with a system of joint grooving to .

form a labyrinth seal between the casing halves

ensure perfect alignment of casing halves

inject sealing compound between the casing halves

increase contact pressure between the casing halves' flanges

408

Turbine lube oil suction strainer baskets have .

course perforations

fine perforations

frame lined with wire cloth

self-cleaning design

409

Turbine throttling losses can best be described as a loss of energy occurring .

as a result of friction created when steam passes through the nozzle block

whenever there is leakage of steam from one stage to another through the throttle valve packing gland

as a result of fluid friction caused by frequently throttling the turbine wheel and blade speed

as steam passes through the steam admission valve and there is a drop in pressure without the performance of work

410

Underway on watch in the fire room, the bridge reports black smoke coming from the stack. This would indicate .

fuel oil temperature too low

excessive steam atomization pressure

excessive air-fuel turbulence

All of the above

411

Upon assuming the watch on a steam ship while cargo operations are in progress with the main engine and reduction gear secured, you notice a very large increase in the reduction gear lube oil sump level from previous log book entries. What would be the most probable cause of this large increase in sump level?

Incorrect line-up of lube oil service pump bypass system.

A slight change in the vessel's trim.

Lube oil gravity tank is empty.

All of the above are correct.

412

Upon taking over the watch and the vessel is operating at sea speed, you find the D.C. heater water level to be dropping very slowly. Which of the following would you check to monitor this condition?

Verify that the main and auxiliary condenser hot well levels are normal.

Verify that the boiler water levels are not slowly increasing.

Verify the DC heater spill valve is not partially opened.

All of the above.

413

Upon taking over the watch, while the vessel is at sea speed, you find the following conditions to exist. Which condition should be attended to first and why should this step be taken?

Excessive recirculation of condensate. Failure to properly adjust may cause an increase in condenser level leading to a decrease in condenser vacuum.

Salted up evaporator dumping to bilge. Must immediately be restarted to prevent insufficient quantities of distilled and potable water.

High level in fuel oil sludge tank. Necessary to pump contents to settler to prevent overflow of tank into the bilges.

Leaking air line to auxiliary exhaust live steam makeup valve actuator. Repair or place in bypass control to insure proper pressures in the auxiliary exhaust steam system.

414

Using a dry uncoated sounding rod or tape to measure the depth of water in a reserve feed water tank will .

always be 100% accurate

thoroughly contaminate the feed water

be very inaccurate

be satisfactory if a small amount of oil is floating on the surface

415

Vibration in main propulsion turbines could be caused by .

uneven heating of the rotors

high pressure steam in the first-stage

high vacuum in the main condenser

thrust developed in the turbines

416

Water can enter the lube oil system of a main propulsion turbine unit from .

leaky tubes in secured lube oil coolers

steam sealed turbine glands

vents on tanks and gear casings

all of the above

417

Water carryover in the steam entering a turbine could result in .

excessive rotor shaft wear

blade erosion

turbine overspeed

fracturing of the carbon packing

418

Water contamination in the main propulsion lube oil system is undesirable because .

the flash point of the lube oil is raised to a dangerously high level

water causes oil to clog in journal bearings

emulsification occurs with resultant loss of lubricating qualities

it reduces oil cooler effectiveness

419

Water is best removed from lubricating oil by .

silica gel cartridges

pressure filters

paper edge filters

centrifuging

420

Water removed through centrifugal force in the illustrated unit is displaced from the bowl through .

K

N

V

X

421

Water retained in the lube oil system of a main propulsion turbine installation is undesirable because it ..

causes pitting of the gear teeth

causes the turbine to overspeed

raises the flash point of the oil to a dangerously high level

results in excessive cooling of bearing surfaces

422

What happens to the steam as it moves across the moving blades in a reaction turbine?

It gains velocity at constant pressure.

It creates an axial thrust in the direction of the steam flow.

It loses velocity at constant pressure.

It creates an axial thrust opposing the direction of steam flow.

423

What immediate action should you take if you are on watch and note 'zero' lube oil pressure for the operating main turbine?

Immediately increase cooling water flow to lube oil cooler.

Slow the turbine to minimum speed and watch the bearing temperatures.

Stop the shafts.

Shift strainers and gravity tanks.

424

What is generally found at the end of the low pressure turbine rotor of a cross-compound turbine arrangement?

Cruising turbine

High pressure turbine

Back pressure turbine

Astern turbine

425

What is normally used to compensate for thermal expansion and contraction of the main turbine casing?

Flexible I-beam supports

Rigid mountings

Curved steam lines

Babbitt lined bearings

426

What is the FIRST thing that will happen if both the main and standby lube oil pumps fail on a geared main propulsion turbine operating at full sea speed?

Ahead throttle will close.

Lube oil sump will overflow.

Vacuum will be lost.

HP turbine bearings will overheat.

427

What is the significance of pinion deflection in the operation of reduction gears?

Pinion deflection causes unequal tooth loading.

Deflection is minimal because a longer pinion is more rigid

Deflection causes excessive wear at the center of the pinion.

Deflection causes excessive wear at both ends of the pinion

428

What is used to compensate for the increased possibility of blade vibration occurring with impulse turbine blading?

The decreased pressure drop across the blade due to the thin tip design.

Tuned vibration dampers.

Securing the blade tips with shrouding.

Seal stripping the groove within the turbine casing.

429

What should be done when foreign matter is found in a lube oil strainer?

Immediately stop the main engine and inspect all strainers.

Examine the foreign matter and determine its source.

Periodically open the drain valve to the sludge tank.

All of the above.

430

What should you do if you detect an abnormal vibration in the operating main propulsion turbine?

Notify the chief engineer and stand by the throttles.

Immediately slow the turbine until the vibration ceases.

Immediately stop the turbine.

Open the turbine drains until the vibration ceases.

431

What steps should be taken if excessive steaming and vigorous bubbling occurs in the first section of the drain inspection tank?

Systematically locate and isolate the faulty traps in the main steam piping to the turbo generator.

Locate and secure any unnecessarily opened steam trap bypass valve.

Secure the fuel oil heater currently in use.

All of the above are correct and each step should be taken promptly.

432

What steps should be taken if excessive steaming and vigorous bubbling occurs in the first section of the drain inspection tank?

Secure the fuel oil heater currently in use.

Locate and open any unnecessarily closed steam trap bypass valves.

Systematically locate and isolate any faulty traps in the contaminated steam system piping.

All of the above are correct and should be performed in the order as shown.

433

What steps should be taken if large quantities of fuel oil are found in the drain inspection tank?

Change over to the standby fuel oil heater.

Open steam trap bypass of the fuel oil heater that is on line.

Secure the lube oil purifier and its associated heater.

All of the above

434

What type of lube oil cooler is shown in the illustration?

Self venting

Shell-and-tube

Bundle and stack

Plate type

435

What type of strainer is used in a turbine lube oil system to remove metallic particles?

Magnetic basket strainer

Simplex filter

Metal edge strainer

Fuller's earth filter

436

What will be the FIRST thing to occur if both the main and standby lube oil pumps failed to operate on a geared main propulsion steam turbine operating at full sea speed?

Ahead throttle will close.

Lube oil sump will overflow.

Vacuum will be lost.

Shaft brake will engage.

437

What will occur if the level of the atmospheric drain tank (fresh water collector) is permitted to continuously decrease while the vessel is underway?

The amount of condensate pumped to the contaminated evaporator will decrease.

The pressure of the contaminated steam system will drop once the tank is empty.

Make-up water will be automatically added to the tank via a vacuum drag arrangement.

There is a possibility of loosing vacuum in the main condenser.

438

What will occur if the level of the atmospheric drain tank, (fresh water drain collector) is permitted to continuously rise while the vessel is underway?

The tank will overflow causing a significant loss of potable water.

The pressure of the contaminated steam system will rise when the tank becomes full.

There is a definite possibility of the tank overflowing, causing loss of distilled water.

There will be an increase of vacuum in the main condenser within a short period of time.

439

When a high pressure turbine is operating at sea speed, the pressure of the steam leaking through the shaft gland packing may be slightly higher than the pressure setting of the gland seal regulator. In this situation, the excess steam at the regulator is directed to the .

gland exhaust condenser

excess steam condenser

main condenser

auxiliary exhaust system

440

When a lube oil purifier has been cleaned, but a small amount of sludge remains in one spot of the bowl side, the .

seal will be gradually lost after being placed into operation

through put will be reduced

temperature of the oil input will have to be lowered

dirty oil pump discharge pressure will need to be increased

441

When a reference input signal from the bridge to the engine room takes place, the signal is inverted in the amplifiers and function generators. A negative signal from the amplifier, shown in the illustration, labeled "M", will result in a .

positive signal to the ahead hydraulic actuator pilot motor

negative signal to the ahead hydraulic actuator pilot motor

positive signal to the astern hydraulic actuator pilot motor

negative signal to the astern hydraulic actuator pilot motor

442

When a sudden increase in pressure occurs in a forced lubrication system, you should check for a .

loss of oil flow across one of the bearings

clogged lube oil pump suction

ruptured tube in the lube oil cooler

high lube oil sump level

443

When a turbine bearing shows signs of overheating, you should .

stop the turbine

immediately reduce speed

increase the lube oil pump discharge pressure

increase the cooling water supply to the lube oil cooler

444

When a turbine is in operation, a rotor position micrometer is used to determine any change in rotor .

radial position relative to the casing

radial position relative to the micrometer

axial position relative to the casing

axial position relative to the micrometer

445

When a turbine rotor is not rotating during maneuvering, the heat tends to be concentrated at the .

turbine bleed lines

exhaust trunk

top of the turbine

casing joints

446

When air becomes trapped in the hydraulic fluid of a steering system, the .

rudder will respond erratically

hydraulic ram movement will overspeed

sight glass will show bubbles

ram relief valves will lift

447

When an oil purification centrifuge loses a portion of its seal, the oil can then be discharged through the heavy phase discharge port. This is partly a result of greater .

centrifugal force being developed on the oil near the interface

centripetal force being developed on the oil near the interface

centrifugal force being developed on the water seal at the side of the bowl

centripetal force being developed on the water seal at the side of the bowl

448

When fitting new carbon ring packing on a turbine rotor shaft, carefully filing the ends of the segments will .

reduce the ring segment end clearance

reduce the clearance between the assembled ring segments and shaft

reduce the possibility of scoring the shaft

provide for a greater oil wedge pressure

449

When preparing to get underway and the jacking gear has been disengaged, the main turbine rotor should NOT be allowed to remain stationary for more than 3 minutes because .

uneven heating from gland seal steam can cause distortion of the rotor

the turbine drain lines can fill with condensate

main condenser vacuum will drop rapidly without steam flow through the main unit

with no rotor movement, the journal bearings may overheat due to reduced lube oil flow

450

When relieving the watch in the fire room, you should first check the .

boiler water drum level

boiler steam drum temperature

fuel pressure to the burners

port and starboard settling tank levels

451

When relieving the watch in the fire room, you should first check the boiler steam pressure and .

boiler water level

prepare to blow tubes

stack temperature

port and starboard settling tanks

452

When relieving the watch in the fire room, you should first check the boiler water level and .

port and starboard settling tank temperatures

condition of furnace fires

steam atomization to the mechanical atomizers

feed pump lube oil level

453

When relieving the watch in the fire room, you should first check the boiler water level and .

the port and starboard settling tank temperatures

make up feed tank level

empty all oil drip pans

the condition of the furnace fires

454

When relieving the watch in the fire room, you should first check the boiler water level and then .

check the fuel pressure to the burners

empty all oil drip pans

prepare to blow tubes

check port and starboard settling tank levels

455

When relieving the watch in the fire room, you should first check the fuel pressure to the boiler and .

port and starboard settling tank levels

economizer outlet temperature

empty all oil drip pans

boiler water level

456

When securing a main propulsion turbine equipped with carbon packing glands, the vacuum should always be broken before securing the gland seal steam because .

the turbine rotor expands faster than the gland casing

cold air rapidly entering the gland may result in damage to the carbon segments and sealing surfaces

loop seal will flood the after condenser

gland seal leak off lines will flood with water

457

When securing the main engine, which of the listed procedures should be carried out to remove or reduce condensation from the interior of the main reduction gear casing?

Circulate oil until oil and gear casing have reached ambient temperatures.

Continue to operate the lube oil purifier until there is no water discharge.

Continue to operate the lube oil cooler and rotate the engine with the turning gear.

All of the above.

458

When standing watch at sea, steaming full ahead, adding large amounts of make-up feed water would also have a tendency to change which of the following parameters?

Lower DC heater temperature.

Decrease DC heater level.

Increase air ejector condenser main condensate outlet temperature.

All of the above.

459

When standing watch at sea, steaming full ahead, adding make-up feed water from reserve feed double bottom tanks would also have a tendency to change which of the following parameters?

Increase DC heater temperature.

Decrease DC heater level.

Decrease air ejector condenser main condensate outlet temperature.

Increase main condensate discharge temperature.

460

When standing watch at sea, steaming full ahead, adding make-up feed water would also have a tendency to change which of the following parameters?

Increase DC heater pressure.

Increase DC heater level.

Increase boiler water level.

All of the above.

461

When standing watch at sea, steaming full ahead, adding make-up feed water would also have a tendency to change which of the following parameters?

Decrease DC heater pressure.

Increase DC heater level.

Increase condensate depression.

All of the above.

462

When standing watch at sea, steaming full ahead, reducing the boiler forced draft pressure would also have a tendency to correct which discrepancy?

High superheat temperature.

Black smoke from the stack.

Low boiler pressure.

High fuel oil temperature.

463

When standing watch at sea, steaming full ahead, reducing the boiler forced draft pressure would also have a tendency to correct which discrepancy?

Low superheat temperature.

High stack temperature.

High atomizing steam pressure.

High DC heater level.

464

When standing watch at sea, steaming full ahead, reducing the boiler forced draft pressure would also have a tendency to correct which discrepancy?

Low fuel oil temperature.

High desuperheat steam pressure.

White smoke coming out from the stack.

Low furnace air pressure.

465

When starting a turbo generator in an automated plant, you must provide lube oil pressure to the unit by means of .

a line from the other generator

a line from the gravity tank

the main lube oil pump

the hand operated or auxiliary lube oil pump

466

When starting a turbo generator in an automated plant, you must provide external lube oil pressure to the unit for the purpose of .

energizing the generator overspeed trip

pressurizing the power piston to raise the nozzle lifting beam

opening the exhaust dump valve

pressurizing the power piston to lower the nozzle lifting beam

467

When starting a turbo generator in an automated plant, you must provide lube oil pressure to the unit by means of a/an .

auxiliary lube oil pump

line from the other generator

line from the gravity tank

line from the main lube oil pump

468

When starting a turbo generator, you must initially provide external governor lube oil pressure to .

energize the overspeed trip

raise the nozzle valve lifting beam

energize the gland seal regulator

open the turbine exhaust valve

469

When starting a turbo generator, you must provide lube oil pressure to the governor power piston by means of .

a line from the other generator

a line from the gravity tank

the main lube oil pump

the hand operated or auxiliary lube oil pump

470

When the flow of oil admitted to a disk-type centrifugal purifier is in excess of its designed capacity, which of the following conditions will usually occur?

The oil will discharged through the heavy phase discharge port.

The speed of the centrifuge will increase.

All water will be retained by the purified oil being discharge.

Oil will be present in the water sealing line to the bowl.

471

When the temperature of the main turbine lubricating oil is lowered, an increase will occur in the .

pour point

concentration of contaminants

viscosity

flash point

472

When there is a sudden increase of lubricating oil pump discharge pressure in a force feed lubricating system, you should FIRST check the .

pump relief valve

lubricating oil cooler outlet temperature

lubricating oil flow from the bearings

lubricating oil suction strainers

473

When there is a sudden increase of lubricating oil pump discharge pressure in a force feed lubricating system, you should FIRST check the .

pump relief valve

lubricating oil sump level

lubricating oil flow from the bearings

lubricating oil suction strainers

474

When turbine rotor shafts extend through the casing, an external source of sealing steam is used in conjunction with labyrinth packing to .

maintain the rotor journal temperature

seal the casing during periods of low casing pressure

seal the casing during periods of high casing pressure

provide a constant flow to the gland leak off condenser

475

When used as a separator, a centrifugal purifier may lose its seal and cause .

water to contaminate the lube oil

the purifier pump to lose suction

water flow from the oil discharge

oil flow from the water discharge

476

When water is removed from lube oil passing through a centrifugal purifier, the water removed will .

be retained in the bowl

force the diameter of the oil column within the bowl to be narrowed

displace water from the heavy phase discharge port, but of an amount less than that removed from the oil

displace an equal amount of water from the bowl seal

477

Where are moisture shields located in a main propulsion steam turbine?

Around throttle valve stems

At the steam strainer inlet

At the inner stage diaphragms

After the last stage of the ahead rotor blading

478

Where reaction turbine blading is fitted with shrouding of "end tightened" design, which of the following conditions will be the most critical to efficient turbine operation?

Rotor axial position

Diaphragm clearance position

Rotor radial position

Rotor casing sliding foot position

479

Where reaction turbine blading is fitted with shrouding of "end tightened" design, which of the following operating parameters must be carefully monitored for efficient turbine operation?

Rotor axial position

Diaphragm clearance position

LP bleed steam pressure

HP bleed steam pressure

480

Which component of a Kingsbury thrust bearing assembly transmits the thrust from the line shaft to the oil film and shoes?

Collar

Lower leveling plate

Upper leveling plate

Base ring

481

Which condition could cause a low level in the deaerating feed water tank (DC heater) as the vessel is increasing from maneuvering to sea speed?

Maintaining the water levels of both boilers excessively high

Excessive recirculation of main condensate

Insufficient flow of make- up feed to the condenser

All of the above

482

Which condition would cause a dangerously low level in the deaerating feed water tank (Direct Contact) heater during maneuvering?

Excessive dumping of feed water to the distilled water tank via the automatic dump valve.

Excessive recirculation of condensate to the drain inspection tank.

Improper operation of the auxiliary exhaust live steam dump valve.

Open bypass valve of the automatic/pneumatic makeup valve assembly.

483

Which condition would cause a dangerously low level in the deaerating feed water tank (Direct Contact) heater as the vessel is increasing from maneuvering to sea speed?

Excessive dumping of feed water to the drain inspection tank via the automatic dump valve

Excessive recirculation of condensate to the drain transfer tank

Internal collapse of a rubber expansion joint located in the condensate pump suction line

Clogged "Y" strainer at the condensate inlet of the pneumatically operated condensate recirculating valve assembly

484

Which condition would cause a dangerously low level in the deaerating feed water tank (Direct Contact) heater as the vessel is increasing from maneuvering to sea speed?

Excessive dumping of feed water to the drain inspection tank via the automatic dump valve.

Excessive recirculation of condensate to the drain transfer tank.

Improper operation of the auxiliary exhaust live steam dump valve.

Clogged "Y" strainer at the air supply of the pneumatically operated condensate makeup valve assembly.

485

Which condition would cause a high level in the deaerating feed water tank (DC heater)?

Excessive dumping of feed water to the distilled water tank.

Excessive recirculation of condensate to the auxiliary condenser.

Temporarily operating both boilers at below normal water levels.

Improper operation of the air ejector loop seal.

486

Which condition would cause an excessively high level in the deaerating feed water tank (DC heater)?

Excessive dumping of feed water to the distilled water tank.

Excessive recirculation of condensate to the auxiliary condenser.

Improper operation of the condensate makeup valve.

Improper operation of the air ejector loop seal.

487

Which condition would cause an excessively high level in the deaerating feed water tank (Direct Contact) heater during maneuvering?

Excessive dumping of feed water to the distilled water tank.

Excessive recirculation of condensate to the auxiliary condenser.

Improper operation of the live steam makeup valve supplying the auxiliary exhaust system.

Open bypass valve to the automatic makeup valve assembly.

488

Which following condition could occur if the distilled water tank level indicator has been giving an erroneously high reading?

It is possible to lose vacuum if the level drops below the make- up feed piping connection.

Past logbook entries must all be changed to indicate actual amounts.

The tank may overflow in the engine space causing unnecessary damage to electrical equipment.

All of the above are correct.

489

Which immediate action should you take when the temperature of one line shaft bearing increases above its normal operating temperature?

Stop the unit and carefully inspect the bearing.

Stop the unit and replace the bearing.

Check the bearing for proper lubrication.

Check for proper water circulation to the lube oil coolers.

490

Which of the bearings listed is used in some turbines to limit axial movement?

Pivoted-shoe type thrust bearing

Self-adjusting, spherically-seated, self- aligning bearing

Journal bearing

Cylindrical bearing

491

Which of the components listed is indicated by the "X" shown in the illustration?

Strainer

Sight glass

Drain

Branch line

492

Which of the conditions listed could cause an oil flow sight glass, of a main turbine bearing, to be completely filled with oil?

An increase in oil temperature.

A restriction in the oil drain line to the sump.

Excessive air trapped in the lube oil system.

Increasing the amount of oil through the gravity tank overflow line.

493

Which of the conditions listed is the most common source of torsional vibration in a geared turbine drive?

Gear excited critical vibrations

Propeller excited vibrations

Turbine rotor imbalance

Changing shaft thrust

494

Which of the conditions listed should be immediately reported to the engineering officer on watch?

Steam leaving the vent of the gland exhaust condenser.

Lube oil passing through the bull's eye of the gravity tank overflow line.

Oil in the drain inspection tank.

Water trickling in through the stern gland.

495

Which of the conditions listed would cause the stern tube lube oil head tank level to decrease?

An increase in sea water temperature.

The entry of sea water into the system.

An increase in the stern bearing operating temperature.

A worn or damaged stern tube seal.

496

Which of the conditions listed would indicate water carryover to a turbine?

Loss of condenser vacuum.

High steam temperature in the high pressure turbine steam chest.

Decreased condensate salinity.

Noise and vibration in the turbine.

497

Which of the coupling types listed is shown in the illustration?

Claw

Pin

Gear

Solid

498

Which of the devices listed are used to rigidly mount reduction gear bearings in their housings?

Keyways and keys

Spherical housings

Dowels or locking screws

Notched construction

499

Which of the devices listed can be used to determine bearing wear on a main propulsion turbine bearing?

Bridge gage

Soft lead wires

Micrometer depth gages

All of the above.

500

Which of the devices listed is commonly used to compensate for the expansion and minor misalignments occurring between the main turbine rotor and the reduction gear?

Sliding sleeve

Gear type flexible coupling

Expansion gear

Quill shaft

501

Which of the devices listed is found on an LP main propulsion steam turbine casing?

Duplex set of relief valves

Sliding beam

HP turbine bypass valve

Sentinel valve

502

Which of the devices listed is generally used to engage the main engine turning gear to the high pressure turbine high- speed pinion?

Manually operated band brake

Manually operated sliding jaw clutch

Sleeve coupling

Quill shaft

503

Which of the devices listed is used to convert thermal energy into rotor kinetic energy in a reaction turbine?

Nozzle diaphragms

Labyrinth nozzles

Moving blades

None of the above

504

Which of the devices listed is used to convert thermal energy to useful mechanical work?

Turbine

Condenser

Air ejector

Each of the above

505

Which of the effects listed describes the changes in the velocity and pressure of the steam as it passes through a nozzle?

Velocity increases and pressure increases

Velocity increases and pressure decreases

Velocity decreases and pressure increases

Velocity decreases and pressure decreases

506

Which of the features listed, regarding the Kingsbury thrust bearing, prevents the base ring from turning and secures it to its housing?

Pin

Dowel

A combination of pin and dowel

Keyed construction

507

Which of the flexible coupling types listed is used in most turbine reduction gear installations?

Friction clutch

Gear

Bend

Flange

508

Which of the following bearings is designed to take loads applied to the axis of the shaft?

Radial

Spring

Strut

Thrust

509

Which of the following conditions is indicated by oil flowing through a lube oil gravity tank overflow bulls-eye?

Excessive oil is stored in the gravity tank.

Sufficient oil flow is being supplied to the gravity tank.

Insufficient oil is being pumped to the gravity tank.

Turbine bearing failure has occurred.

510

Which of the following conditions is indicated by the necessity of providing excessive gland sealing steam pressure to maintain the normal operating conditions of the main propulsion unit?

Vacuum leak in the condenser shell.

Flooded main condenser hot well.

Worn or damaged labyrinth packing.

Restriction in the gland leak off piping.

511

Which of the following conditions is the engineer's FIRST warning that the main lube oil pump has stopped?

Gravity tank low level alarm will sound.

Lack of oil in the overflow bull's-eye is observed.

High main engine bearing temperatures will be noted.

Low main sump level alarm will sound.

512

Which of the following conditions may exist if you detect an excessive amount of metal particles on a main engine lube oil strainer magnet?

Journal bearing damage.

Turbine shrouding damage.

Reduction gear damage.

Main shaft bearing damage.

513

Which of the following construction methods would apply to the babbitt lined, split-type, reduction gear bearings?

They are always mounted with the split in a horizontal plane.

They are secured in their housing so pressure points will occur at the joint faces.

They are split into four equal sized segments.

They are rigidly mounted and dowelled in their housings.

514

Which of the following descriptions best describes a basic Rateau turbine stage?

One set of nozzles and two rows of moving blades.

One set of nozzles and one row of moving blades.

Two sets of nozzles and two rows of moving blades.

Two sets of nozzles and one row of moving blades.

515

Which of the following designs is an essential feature of the Rateau type turbine?

A large pressure and temperature drop occurring in the first stage.

The use of alternate rows of fixed and moving blades.

The use of a velocity- compounded impulse stage installed at the high pressure end of the turbine.

Two or more simple impulse stages aligned in tandem in one casing.

516

Which of the following enables a Kingsbury, or any pivot shoe type thrust bearing, to bear a much greater load per square inch of working surface than parallel surface bearings?

The thickness of the filler piece behind the pivotal-shoes is adjusted to obtain a more accurate fit.

Clearances are automatically adjusted to the correct value when wear occurs.

The shoes tilt slightly thereby allowing the formation of a wedge shaped oil film under a thrust load.

The shoes pivot, thus remaining parallel with the collar when thrust loads are applied.

517

Which of the following factors determines the type of construction used for gear hubs in shipboard reduction gear units?

Size of the gear wheel

Type of reduction gear unit

Type of ship using installation

Type of steam turbine installation

518

Which of the following is used to hold the poppet valves closed in a turbo generators nozzle control speed regulator?

Lifting beam

Springs

Steam pressure

Oil pressure

519

Which of the following lube oil system lines generally includes an illuminated sight glass (bull's-eye)?

Lube oil pump suction

Lube oil pump discharge

Gravity tank discharge

Gravity tank overflow

520

Which of the following methods is used to counter axial thrust in a single flow reaction turbine?

A dummy piston and cylinder at the turbine inlet end

Pressure equalizing holes in the individual rotor wheels

Labyrinth packing

Carbon packing

521

Which of the following methods is used to lubricate main propulsion turbine reduction gears?

The gears run through an open oil sump and oil is carried along on the gear teeth.

Oil is sprayed through nozzles at the point of gear mesh.

Oil is pressure fed through internal drilled passages which force oil to the gear's periphery.

Oil rings in channels outside the gears dip into oil in the sump and carry it to the gear teeth.

522

Which of the following methods is used to securely fasten the babbitt lining of a reduction gear bearing to its shell?

The babbitt is centrifugally spun into the bearings or cast under a pressure head.

The babbitt is relieved in way of the split and held in place by locking pins.

The babbitt is securely bonded to the shell by the pressure of the hydrodynamic oil wedge.

The babbitt has a crescent shaped pocket cast symmetrically about the bearing split.

523

Which of the following methods provides for axial movement in a gear type flexible coupling?

External teeth on the floating member are allowed to slide between internal teeth on the shaft rings.

Each gear is allowed to slide on its shaft between retaining collars.

A coupling permits free relative radial motion of the gear and pinion, thereby allowing axial movement.

Opposing helices act to balance axial thrust with the coupling.

524

Which of the following occurs in a single stage of a simple impulse turbine?

The steam experiences a single pressure drop through the nozzles and impinges on a row of moving impulse blades.

Steam velocity and pressure decreases through the nozzles and impinge on a row of moving reaction blades.

Steam expands through the nozzles and impinges on a row of reaction blading causing an additional pressure drop.

Steam velocity decreases and pressure increases through the nozzles and impinges on a row of impulse blades.

525

Which of the following operational practices is helpful in avoiding the accumulation of condensate in the main reduction gear casing?

Always ensure that the lubricating oil pressure is 14-17 psi when operating in unusually cold waters.

The temperature of the lubricating oil should not exceed the gear manufacturer's recommendation when the unit is operating at full load.

After the main unit is secured, lubricating oil should be circulated until the temperature of the oil and reduction gear casing approximates the engine room temperature.

Avoid applying gland sealing steam to the low pressure turbine until you are ready to start up the first-stage air ejector.

526

Which of the following problems can occur from improper main turbine warm-up?

Distortion of the rotor

Rubbing of blades

Uneven casing heating

All of the above

527

Which of the following problems is likely to occur if the lube oil level in the sump is too high?

Aeration of the oil.

A rise in oil temperature.

The main engine could not be operated at full speed.

All of the above.

528

Which of the following reaction turbine components listed converts thermal energy into kinetic energy.

Fixed and moving blades

Fixed blades only

Moving blades only

None of the above

529

Which of the following reaction turbine components listed converts thermal energy into kinetic energy.

Fixed and moving blades

Fixed blades only

Moving blades only

nozzle diaphragms

530

Which of the following represents one of the designed functions of reduction gears?

Change rotary motion into linear motion.

Combine multiple speed inputs into a single low speed output.

To amplify low speed to high speed.

Utilize a single engine input and convert to multiple propeller output.

531

Which of the following statements about gravity type lube oil systems is correct?

Any lube oil pump failure causes immediate damage to turbine bearings.

The discharge from the gravity tanks flows to the lube oil pump suction.

Gravity tank overflow lines are lead directly to the lube oil sump.

Gravity tanks are fitted with an overflow alarm.

532

Which of the following statements best describes the actions occurring to the oil as it flows through a disk type centrifugal purifier?

The purified oil is only thrown outward and away from the spindle of the machine.

Water, along with most of the dirt and sludge, is discharged past the discharge ring, located at the top of the bowl.

Most of the dirt and sludge is forced to accumulate on the vertical surfaces of the bowl.

As the dirty oil flows down through the distribution holes in the disks, the high centrifugal force causes the water to move outward.

533

Which of the following statements concerning the design of balanced throttle valves is correct?

They commonly use a conventional valve disc and a balance piston.

They commonly use two parallel seats and a balance cylinder.

Both ahead and astern valves normally have a positive opening tendency.

The ahead throttle valve normally utilizes a guarding valve.

534

Which of the following statements concerning the operation of a lube oil purifier is correct?

They should be operated as clarifiers for optimum moisture removal.

They should be operated at maximum design speed and recommended operating capacity.

They should be operated as slowly as possible to ensure a long service life.

They should not be primed with water when operated as a separator.

535

Which of the following statements defines the term 'axial float' in reference to reduction gears?

Idler gears reduce axial loads when reversing rotation

The gears cut with a single helix have axial thrust eliminated.

The gears are capable of free radial motion

The gears are capable of free axial motion

536

Which of the following statements defines the term 'axial float' in reference to reduction gears?

The gears are not subject to excessive tooth loads due to mismatching of the journal bearing halves.

The gears cut with a single helical profile have axial thrust eliminated.

The gears are capable of free motion, neither supporting nor being supported radially by other gears.

A pinion is capable of free axial motion, mating with a fixed double helical gear which establishes its position in the gear train.

537

Which of the following statements describes how the main propulsion turbine overspeed relay initiates closing of the throttle valve?

Excessive centrifugal force causes a spring loaded weight to trip a valve latch.

Excessive centrifugal force causes spring loaded fly balls to actuate a control lever.

Excessive speed causes an oil pump to develop sufficient pressure to open a spring loaded relay valve which tends to close the steam control valve.

Excessive speed causes an increase in lube oil control temperature which actuates a solenoid oil dump valve.

538

Which of the following statements describes the function of a ship's propulsion plant main reduction gear thrust bearing?

Support the weight of the reduction gears.

Absorb the transmitted power when radial thrust is developed.

Absorb the axial thrust transmitted through the shaft from the propeller.

To absorb only the thrust developed by the high pressure turbine.

539

Which of the following statements is correct regarding axial thrust in a high pressure velocity-compounded turbine?

Most of the thrust produced is counter balanced by the action of a dummy piston.

Only a small portion of the thrust produced is counter balanced by the action of a dummy piston.

The thrust is minimized by equalizing holes drilled in the turbine wheels.

The thrust is transmitted to and absorbed by the high speed pinion and gear.

540

Which of the following statements is correct regarding the selection of the proper size ring dam for a tubular-type lube oil purifier?

The size ring dam used depends on the viscosity of the oil being purified.

While all ring dams have the same inside diameter, the outside diameters vary.

Ring dams of larger sizes are indicated by smaller numbers.

Satisfactory purification is obtained when the ring dam is the largest size possible, and no oil is present at the water discharge.

541

Which of the following statements is true concerning lube oil coolers?

The temperature of the oil is less than that of the cooling water.

The pressure of the oil is less than that of the cooling water.

The pressure of the oil is greater than that of the cooling water.

Magnets are installed in the tube sheets to remove metal particles.

542

Which of the following statements is true concerning the centrifuging of lubricating oil?

Centrifuging is more effective with inhibited oils than straight mineral oils.

Centrifuging is more efficient when the oil is preheated prior to centrifuging.

Silicones are water soluble and easily removed by centrifuging.

Centrifuging will purge the oil of various contaminants, including acids and alkalis.

543

Which of the following statements is true concerning the coupling shown in the illustration?

It allows for any misalignment between the main turbine and the second reduction gear.

It is commonly used between the first reduction pinion and the second reduction gear.

It is suitable for use on small auxiliary turbines only.

It can be used to connect the main turbine to the high- speed pinion.

544

Which of the following statements is true concerning the lube oil system shown in the illustration?

The gravity tank directly provides the normal supply of oil to the turbines and gears.

The gravity tank overflow line leads directly to the lube oil sludge tank.

The three-way temperature control valve bypasses cooling water around or through the lubricating oil cooler to maintain the desired oil temperature.

The drains from lube oil coolers can be directed back to the main sump, the sludge tank or the lube oil purifier.

545

Which of the following statements is true concerning the turbine shown in the illustration?

The low pressure turbine is designed with reaction type stages

The astern element is of the Curtis type consisting of two three- row stages

A steam deflector is provided between the astern element and the ahead stages of the LP turbine.

The ahead rotor can be classified as a helical flow, Parsons type turbine

546

Which of the following statements is true concerning the turning gear rotor arrangement shown in the illustration?

The second reduction worm gear always rotates whenever the turning gear motor is in operation; regardless of the position of the engaging handle.

The turning gear motor coupling is engaged by the locking device.

In order for the 'turning gear engaged' indicating lamp to be lit, the switch must be of the normally closed type.

The first reduction gear meshes directly with the bull gear.

547

Which of the following statements is true regarding lube oil coolers used for main steam propulsion systems?

Regulating the inlet water flow to a lube oil cooler may result in air binding of the water side.

A lube oil cooler is typically constructed as a cross-flow type heat exchanger.

The coolers may be bypassed when operating in warm sea water temperatures.

The lube oil usually flows thru the tubes and the cooling water around the tubes.

548

Which of the following statements represents an example of a throttling loss in a turbine?

Friction as steam passes over the walls of the nozzles.

Steam leaving the last stages of the turbine.

Steam passing through a steam admission valve.

Steam leaking over the tips of fixed and moving blades.

549

Which of the following statements represents the function of the center groove machined on a double-helical gear?

It allows the gears slight axial movement without gear damage.

It allows a path for oil to escape regardless of the direction of rotation.

It prevents excessive axial thrust loads from developing on the teeth.

It is used to distribute oil to the gear teeth.

550

Which of the following statements represents the function the nozzle assembly performs in an impulse turbine?

Converts the steam's thermal energy into kinetic energy by increasing its velocity and directing it against the rotor blades.

Provides an area where the steam is prevented from expanding prior to being directed against the rotor blades.

Increases the velocity of the steam without a pressure drop across the diaphragm.

Converts the potential energy of steam into thermal energy by increasing its pressure and directing it against the turbine blades.

551

Which of the following statements represents the principle of operation of the Kingsbury type thrust bearing?

A flat film of oil is more readily formed and maintained than a wedge shaped oil film.

A flat film of oil can carry heavier loads than a wedge shaped oil film.

A wedge shaped film of oil absorbs less heat than a flat oil film.

A wedge shaped film of oil is more readily formed and maintained than a flat oil film.

552

Which of the following statements represents the reason why the babbitt of a turbine journal bearing is relieved at the point of oil entry along the horizontal joint?

To prevent oil from backing up in the supply line.

To permit oil to discharge through the rear of the bearing.

To prevent hydraulic pressure buildup when the journal rotates.

To permit the rotor journal to draw oil around the shaft.

553

Which of the following statements represents the significance of the differential pressure existing between the nozzle block and steam chest of a turbo generator equipped with a lifting beam mechanism?

The pressure differential necessitates the use of a special balance piston.

The pressure differential eliminates the possibility of valve binding in the lifting beam.

The pressure differential requires the installation of a special biasing spring to open the valves.

The pressure differential assists in seating the valves when the lifting beam is lowered.

554

Which of the following statements would best describe the purpose of operating the hand lube oil pump on an auxiliary turbo-generating unit?

It supplements the main lube oil pump flow while paralleling the generators.

It empties the governor control reserve prior to shutting down.

It assists in opening the governor control valve while starting the unit.

It permits the changeover of lube oil filters.

555

Which of the following types of bearing lubrication schemes can carry the highest unit loading?

Ring lubricated

Disk lubricated

Pressure lubricated

Oil whip lubricated

556

Which of the following types of bearings are used as line shaft bearings?

Ring-oiled, babbitt- faced, spherical seat, shell

tapered roller, split type radial

Segmental, pivoted- shoe thrust

Rigidly mounted, radial sleeve

557

Which of the following types of bearings are used for the reduction gears in a marine steam turbine installation?

Babbitt lined split shell

Lignum vitae lined precision

Bronze lined cutlass

Sintered bronze bushings

558

Which of the following types of bearings is designed to limit end movement and carry loads applied in the same direction as the shaft axis?

Rigidly mounted reduction gear bearing

Segmental pivoted- shoe thrust bearing

Self-aligning radial bearing

Spherically-seated radial bearing

559

Which of the following types of main propulsion turbines is most likely to require a dummy piston or cylinder arrangement to counterbalance axial thrust?

Double flow impulse turbine.

Multistage impulse turbine.

Double flow reaction turbine.

Single flow reaction turbine.

560

Which of the following types of main propulsion turbines is most likely to require a dummy piston or cylinder arrangement to counterbalance axial thrust?

Double flow impulse turbine

Multistage impulse turbine

Double flow reaction turbine

Single flow reaction turbine

561

Which of the following would cause the dowel or locking lip of a split-type, precision insert, main bearing to shear and allow the bearing to rotate with the journal?

Unequal torque to any two adjacent bearing bolts

Excessive bearing bolt torque

Insufficient bearing crush

Short periods of above normal operating speeds

562

Which of the following would contribute to the formation of an oil and water emulsion, in addition to acid formation?

Aeration, agitation, and heat

Solid insoluble particles, aeration, and heat

Water and solid insoluble particles

Water, agitation, and heat

563

Which of the journal bearings listed most easily accommodates the minor turbine shaft misalignment?

Ball bearings

Roller bearings

Spring bearings

Spherically seated bearings

564

Which of the listed actions will occur when there is an increase in load on a ship service generator equipped with a centrifugal type hydraulic governor?

The governor weights move outward.

The operating piston is forced to move lower.

More oil will enter the operating cylinder (O).

Steam flow to the turbine decreases.

565

Which of the listed conditions could occur if during start-up the rotor illustrated shifts radially?

The teeth in segments "A" could be sheared off as they rubbed against the sides of the machined rotor lands.

No appreciable damage would result as the segments "A" would simply move outward against spring compression.

Enough frictional heat would be produced, even in that short period of time, to cause distortion and ultimate scoring of the shaft.

None of the above as the operator would be fore warned of this situation through the action of the squealer ring "D".

566

Which of the listed items are the two most commonly used opposing forces involved in the operation of a constant pressure boiler feed pump governor?

Steam inlet pressure and pump discharge pressure.

Pilot valve steam pressure and control valve spring pressure.

Steam inlet pressure and adjusting spring tension.

Pump discharge pressure and adjusting spring compression.

567

Which of the listed operational checks should be made "continuously" on the main propulsion reduction gears?

Check radial bearing wear.

Inspect alignment between gears and turbine.

Check teeth for pitting and scuffing.

Check bearing lube oil temperatures.

568

Which of the listed parts illustrated in the turbo generator governing system, provides the follow-up to prevent the nozzle valves from cycling between the fully open and fully closed positions, with each variation in turbine speed?

D

O

H

E

569

Which of the listed parts of a Kingsbury thrust bearing tilts to permit the formation of a wedge shaped film of oil?

Collar

Base ring

Dowel disk

Shoes

570

Which of the listed parts shown in the illustration of the turbo- generator governing system, provides the follow-up motion to prevent the nozzle valves from cycling between the fully open and fully closed positions with each variation in turbine speed?

Synchronizer

Operating cylinder

Main speed governor

Restoring linkage

571

Which of the listed procedures should be followed when raising vacuum on the main propulsion plant prior to getting underway?

Start the condensate and circulating pumps, engage the turning gear, start the lube oil system, then start the first-and second-stage air ejectors and the gland sealing.

Start the condensate and circulating pumps, start the lube oil system, start the air ejectors and the gland sealing system, and engage the turning gear.

Start the lube oil system, engage the turning gear, start the condensate and circulating pumps, start the gland sealing system and second- stage air ejector.

Start the lube oil system, start the second-stage air ejector and the gland sealing system, start the condensate and circulating pumps, and start the turning gear.

572

Which of the parts listed for a reaction turbine serve the same function as the nozzles of an impulse turbine?

Fixed nozzles

Moving nozzles

Moving blades only

Fixed blades and moving blades

573

Which of the statements listed applies to the quill shaft shown in the illustration?

It provides torsional rigidity to help maintain alignment between gear train and the turbine rotor.

It permits axial movement between the high speed gear and low speed pinion.

It compensates for high speed pinion radial misalignment.

It absorbs the axial thrust generated by the meshing gears.

574

Which of the steam losses listed would be associated with a multistage impulse turbine rather than a multistage reaction turbine?

Radiation loss

Leaving loss

Blade and nozzle loss

Diaphragm packing loss

575

Which possible condition has occurred if a vacuum is present at the atmospheric drain tank vent while the vessel is underway?

The control valve regulating flow to the main condenser is stuck in an open position.

The control valve ball float has been holed causing the ball to remain in a lowered position.

There is a definite possibility of the tank overflowing causing loss of distilled water.

There will be an increase of vacuum in the main condenser within a short period of time.

576

Which ring dam arrangement should be used for centrifugal purification?

The largest inside diameter ring without loss of oil.

The largest outside diameter ring without loss of oil.

The smallest inside diameter ring without loss of oil.

The smallest outside diameter ring without loss of oil.

577

Which steam plant operating condition requires priority attention over the other situations listed?

High level of lube oil in the refrigeration compressor

High water level in the deareating feed water heater

Low level effluent in chlorination section of sewage tank

High water level in the fuel oil sludge tank

578

Which steam plant watch operating condition requires priority attention over the other conditions listed?

High level main condenser

High lube oil storage tank level

Low sewage tank chlorination section level

Vapor issuing from deaerating heater vent

579

Which steam plant watch operating condition will require priority attention over the other conditions listed?

High level main condenser

High level lube oil storage tank

Low water level main boiler

Deareating tank pressure 2 psig above normal

580

Which steam plant watch operating condition will require priority attention over the other conditions listed?

High level hydrazine dosing tank

High level lube oil storage tank

Low sewage tank chlorination section level

Low lube oil level in the operating feed pump

581

Which steam plant watch operating condition will require priority attention over the other situations listed?

Low level, lube oil gravity tank

High level, lube oil storage tank

Low level, chlorination section of the sewage tank

Low lube oil level to operating, chemical dosing pump

582

Which steam plant watch operating condition will require priority attention over the other situations listed?

Low oil level in the steering gear sumps

High lube oil level in all storage tanks

Low level effluent in chlorination section of sewage tank

Low bilge water levels throughout entire engine room

583

Which steam plant watch operating condition will require priority attention over the other situations listed?

Low level of lube oil in cleansing tank

High level of lube oil in storage tank

Low level effluent in chlorination section of sewage tank

High water level in main propulsion boiler

584

Which steam plant watch operating condition will require priority attention over the other situations listed?

Low level in lube oil sludge tank

High level in lube oil in storage tank

Low level effluent in chlorination section of sewage tank

High bilge water level throughout engine room

585

Which turbine blade is best suited for high pressure installations?

Pot-brazed oval shrouded type

Gaged type

Wire-lashed type

Shrouded segmental type

586

Which type of bearing lining material is most commonly used in modern precision split type bearings?

Zinc

Monel

Babbitt

Copper

587

Which type of packing is primarily utilized to control steam leakage from the casing of a modern auxiliary turbine?

Teflon

labyrinth

carbon

dovetail

588

Which type of reduction gear arrangement is shown in the illustration?

Locked train, double reduction.

Articulated, double reduction.

Nested, double reduction.

Two-pinion, single reduction.

589

While a vessel is underway the low pressure turbine high- speed pinion is damaged. The pinion is then removed from the gear train. Under these circumstances, the main unit is capable of which speed and direction?

Reduced speed ahead only

Reduced speed astern only

Reduced speed ahead and full speed astern

Reduced speed astern and full speed ahead

590

While a vessel is underway, one of the FIRST indications of the failure of the gland leakoff exhaust fan motor is .

excessive steam leakage at the turbine glands

loss of vacuum at the turbine

increased turbine exhaust temperature

water knock on the turbine gland steam header

591

While a vessel is underway, one of the FIRST indications of the failure of the gland leakoff exhaust fan motor is .

loss of vacuum at the turbine

increased turbine exhaust temperature

water knock in the turbine gland steam header

excessive steam leakage at the turbine glands

592

While a vessel is underway, which of the conditions listed would indicate a leak in the lube oil cooler?

Excessive lube oil consumption.

Excessive water discharge rate from the lube oil purifier.

Contamination of the lube oil.

Corrosion of the journals and bearings.

593

While making a round of the engine room, the oil in all of the main engine bearing sight glasses appears to be milky. The probable cause is .

cold running of the bearing

collapse of the oil wedge

air leakage into the bearing

water contamination of the lube oil

594

While making engine room rounds at sea, you observe excessive steam leaking from the forward gland on the high pressure turbine. This may indicate that the .

turbine is operating at low speed

gland seal leakoff line is obstructed

main condenser vacuum is too high

drains were left open

595

While making your rounds, you notice the main lube oil temperature to be higher than normal. To remedy this situation, you should .

speed up the main lube oil pump

open the lube oil cooler seawater inlet valve wider

throttle in on the lube oil cooler seawater discharge valve

increase the opening of the lube oil cooler seawater discharge valve

596

While on watch aboard a 900 psi (6.2 MPa) steam vessel, you suddenly hear a loud, piercing, high-pitched noise. Which of the following actions should you take?

Vacate everyone from the engine room immediately, as this is the preliminary signal that CO2 is about to be released.

Rapidly move towards the direction of the noise to investigate the probable source.

Cautiously move towards the source of the noise, sweeping the beam of your flash light ahead of you.

Move away from the noise to find a broom, then cautiously advance, sweeping the handle ahead of you to locate the source.

597

While on watch aboard a 900 psi steam vessel, you suddenly hear a loud, piercing, high-pitched noise. Which of the following actions should you take?

Vacate everyone from the engine room immediately, as this is the preliminary signal that the steam smothering system is about to be released.

Rapidly move towards the direction of the noise to investigate the probable source.

Cautiously move towards the source of the noise, sweeping the beam of your flash light ahead of you.

Move away from the noise to find a broom, then cautiously advance, sweeping the handle ahead of you to locate the source.

598

While on watch at sea with only one ship's service turbo- generator on line, the entire plant suddenly blacks out without warning. After restoring power, which of the following faults would most likely have attributed to this casualty?

The turbo-generator throttle valve position "micro switch" vibrated open, allowing the main breaker to trip open according to its protection circuitry.

Someone pushed the trip button to the 'shore power' breaker.

The main air compressor suddenly stopped.

The standby generator started automatically and became motorized.

599

While on watch at sea, you notice the main lube oil pump suction vacuum has been increasing. To correct this you should .

slightly open drain lines on each of the duplex suction strainers to decrease vacuum differential

back flush each of the duplex strainer baskets through the recirculating line

stop the main engine prior to removing suction strainer covers, if changing over to the standby strainer did not correct the condition

rotate the knife edge cleaning device handle one complete turn

600

While on watch in the engine room and steaming at a steady rate, the water level begins to decrease and suddenly drops out of sight in the boiler gage glass. Your FIRST corrective action should be to .

secure the fires

slow down the engines

blow down the boiler gage glass

open the feed water regulator bypass

601

While standing watch at sea and steaming full ahead, reducing the boiler forced draft pressure would also have a tendency to correct which discrepancy?

High superheat temperature.

White smoke from the stack.

High stack temperature.

All of the above.

602

While standing watch in the engine room of a steam vessel while at normal sea speed, you notice that the condensate temperature outlet of the air ejector condenser is fluctuating by approximately 12F. You should therefore .

call the Chief Engineer immediately

only need to log the temperature and inform the watch engineer who will relieve you

only need to add make- up feed to the system

first determine whether the main condenser level is normal and steady

603

While standing watch in the engine room, irregular feeding or surging of the feed water supply to a flash evaporator may be attributed to .

erratic water flow through the air eductor

a clogged vent line from the air eductor condenser

excessive pressure in the seawater feed heater

a dirty strainer in the saltwater feed pump suction line

604

While standing watch in the engine room, which of the following actions should be taken to reestablish a 'blown' air ejector loop seal?

Decrease the steam pressure to the air ejector nozzles.

Shut off the steam to the second stage air ejector momentarily then open it again.

Momentarily close the valve in the loop seal line, then reopen slowly.

Increase the condensate flow through the air ejector.

605

While standing watch in the engine room, you hear a 'crackling' sound coming from within a salt water service system centrifugal pump. The most probable cause for this occurrence would be from an abnormal condition at the .

shaft sleeves

discharge volutes

wearing rings

pump suction

606

While standing watch in the engine room, you notice a high reading at a salinity cell located in the loop seal between two stages of a flash type evaporator. This would indicate .

chill shocking is necessary to remove scale

leakage at the second- stage condenser

faulty operation of the brine overboard pump

carryover in the first- stage

607

While standing watch in the engine room, you suspect air leaking into a flash type distilling plant. The most probable cause(s) of the air leak could occur through .

gasketed joints

valve stems

gage glass packing

all of the above

608

While standing watch underway at sea in the engine room, there is a complete loss of electrical power. When power is restored, the steering gear pump motor will .

have to be restarted from the steering gear room

have to be reset before restarting

restart automatically because it utilizes an LVR controller

trip via the overload relay

609

While standing watch underway at sea, you notice salinity carryover in the low pressure distilling plant. This can be a result of .

insufficient chemical feed

a pressure drop through the loop seal

below normal steam supply pressure

low distillate conductivity

610

While standing watch underway in the engine room, failure of the normal power supply will cause the emergency generator to provide power through .

the main bus tie feeder

its output breaker and automatic bus transfer device

line connection feeder

power failure alarm bus

611

While standing watch, what immediate action should you take if you are running at sea speed and notice a sudden and significant drop in lube oil pressure to the main turbine?

Immediately increase cooling water flow to lube oil cooler.

Slow the turbine to minimum speed and watch the bearing temperatures.

Stop the main shaft using astern steam.

Shift strainers and gravity tanks.

612

While standing your engine room watch at sea, you notice the D.C. heater level dropping below the normal minimum level as indicated by the remote level indicator. Which of the following actions should be taken?

Immediately stop the main engine.

Do nothing in particular as this is a common occurrence with steam propulsion plants.

It is only necessary to immediately open the automatic make-up feed bypass valve.

Open the make-up feed valve bypass valve and check the condenser and make-up feed tank levels immediately.

613

While standing your engine room watch at sea, you notice the D.C. heater level is dropping below normal as indicated by the remote level indicator. The boiler drum level is observed to be normal, as is the main condensate pump discharge pressure. Therefore, you should .

increase the boiler firing rates

decrease the boiler firing rates

reduce the feed water level set point

open the make-up feed bypass valve

614

While standing your engine room watch at sea, you notice the D.C. heater level is gradually dropping as indicated by the remote level indicator. Which of the following actions should you take?

Do nothing as this is a common marine plant occurrence.

Immediately open the automatic make-up feed bypass valve.

Check the condensate level in both the main and auxiliary condenser hot wells.

Immediately stop the main engine.

615

While underway at sea, a mechanical malfunction in one of the ship's service generators operating in parallel, requires that you must secure that generator. In order to prevent a possible overload to the remaining generator, which of the following sequential courses of action should be taken?

Trip the malfunctioning generator's circuit breaker and prime mover throttle trip.

Trip all non-vital distribution feeder circuit breakers, decrease the load on that generator by using the governor, trip the malfunctioning generator's circuit breaker, and trip the prime mover throttle.

Trip the malfunctioning generator's circuit breaker and distribution feeder circuit breakers.

Trip all non-vital distribution feeder circuit breakers, the malfunctioning prime mover turbine throttle trip, and the generator circuit breaker.

616

While underway at sea, one of three available centrifugal salt water service pumps is in operation with a sea water temperature of 50F. The operating temperature of all the systems supplied by this pump appear to be high. Your next proper course of action would be to .

start a second pump and operate it in parallel

start a second pump and verify a higher discharge pressure after securing the first pump

start the second pump, open the casing vent valve of the first pump, then secure the first pump

start the second pump, secure the first pump and do nothing else with the salt water service system

617

While underway on watch in the engine room of a steam vessel, the proper valve positions for controlling feed water to the boiler using the auxiliary feed system should be .

the auxiliary check valve fully open and the stop valve used to regulate the amount of flow

the stop valve fully open and the auxiliary check valve used to regulate the amount of flow

the stop and check valves fully open and the feed pump speed used to regulate the amount of flow

the check valve fully open and the stop valve regulated by the feed water regulator

618

While underway on watch, you notice that you need to constantly increase the coil pressure in the high pressure contaminated evaporator to maintain capacity. Which of the following may be the cause?

The brine density is improper.

The heating transfer surfaces are being layered with scale.

Impure distillate is being produced.

Shell vapor pressure is constantly decreasing.

619

While underway on watch, you notice that you need to constantly increase the coil pressure in the high pressure contaminated evaporator to maintain capacity. Which of the following may be the cause?

The water level is too high.

Excessive distillate is being produced.

The heating coils have excessive scale buildup.

Shell pressure is excessive.

620

While underway, the boiler water level in a steaming boiler begins dropping rapidly and cannot be kept at the normal level by standard practices. As the engineer on watch, your next action should be to .

continue to speed up the feed pump to raise the water level

blow down the gage glass to find the true water level

secure the steam stop and then secure the fires

secure the fires and then secure the main feed stop/check valve to the boiler

621

Why are convergent-divergent nozzles used in high- pressure turbine applications?

They are easy to manufacture.

They are less susceptible to steam erosion than other nozzle types due to their shape.

They produce a larger pressure drop and therefore are more efficient than other nozzle types.

They direct the steam flow more efficiently than other nozzle types.

622

Why are geared turbine installations equipped with turning mechanisms?

For jacking the main engine over periodically when secured.

For turning the main engine during routine inspections.

For turning the main engine during warm-up and securing operations.

For all of the above purposes.

623

Why are the gear teeth of large reduction gears usually cut in a temperature controlled room?

To prevent stress buildup.

To prevent ambient conditions from affecting the tolerances of the machining process.

To control the size of the journals.

To control cutting machine vibration.

624

Why do double flow reaction turbines produce very little axial thrust?

Because there is no pressure drop across the blades.

Because partially expanded steam is exhausted to the low pressure turbine where the expansion is completed.

Because the axial thrust is developed on the rotor in opposite directions providing counterbalance.

Because equalizing holes are provided in the turbine wheels.

625

Why is a flexible I-beam rigidly mounted at the forward end of the main turbine?

To relieve stress on the hull.

Allow for turbine casing expansion and contraction.

To relieve stress at the light end of the turbine.

Prevent the reaction developed within the turbine from being transmitted to the hull.

626

Why is a high lube oil level in the main engine reduction gear sump undesirable?

Oil churning may result.

The oil may become aerated.

Oil temperature may rise.

All of the above.

627

Why is it important to maintain good vacuum in a main turbine unit while operating astern?

Reduces windage loss in the astern section.

Prevents the ahead element from operating backwards.

Maintains proper temperatures in the ahead stage.

Limits the amount of time necessary to operate astern.

628

Why is it occasionally necessary to verify the accuracy of the distilled water make-up feed tank level remote indicator?

It is possible to loose vacuum if the level rises above the make-up feed piping connection.

A false high reading may contribute to an increase in condenser absolute pressure.

The tank may overflow in the engine space causing unnecessary damage to all electrical equipment.

All of the above are correct.

629

Why is it occasionally necessary to verify the accuracy of the distilled water make-up feed tank remote level indicator?

It is possible to loose vacuum if the level rises above the make-up feed piping connection.

A false high reading may contribute to an increase in condenser absolute pressure.

The tank will overflow to the potable water tanks causing contamination

All of the above are correct.

630

With vacuum up and the main propulsion turbine standing by while awaiting engine orders, it is necessary to roll the unit alternately ahead and astern every five minutes to .

distribute the gland sealing steam evenly throughout the glands

slowly bring the lube oil and bearings to operating temperature

warm the astern guarding valve and the low lube oil pressure throttle trip

reduce the possibility of warping the turbine rotors

631

You are standing a sea watch in the engine room of a steam vessel. To operate at maximum efficiency, adjustments to the boiler combustion control system should be made by setting the .

fuel oil back pressure

air volume regulators

fuel/air ratio controller

forced draft fan damper positions

632

You are standing watch in the engine room of a steam vessel. You should blow down a gage glass periodically to .

remove any sediment that has accumulated

maintain the proper water level in the steam drum

provide samples for the second assistant

the water check valve

633

You would not see a flow through the bull's-eye of the lube oil gravity tank overflow line when the .

main engines are stationary at a stop bell

main engines are secured and the turning gear is engaged

the lube oil gravity tanks are being drained

main engines are turning at normal sea speed

634

You would not see a flow through the bull's-eye of the lube oil gravity tank overflow line when the .

main engines are stationary at a stop bell

main engines are secured and the turning gear is engaged

the lube oil service pumps are secured

main engines are turning at normal sea speed

635

Your main propulsion boilers are equipped with a two element feed water regulating control system. While on watch, you are required to respond to a 'slow' bell from full sea speed. Under these conditions the automatic feed water regulator will have .

opened the feed water valve wide due to the effect of shrink

closed down on the feed water valve due to the decrease in steam flow demand

partially closed down on the feed water valve due to the effect of swell

fully opened the feed water valve due to the increase in steam flow