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Test Review > Turbine, governors and heat exchanger test > Flashcards

Turbine, governors and heat exchanger test Flashcards

1
Q

when working around steam turbines, you must be aware of steam leaks because they

are invisible

can burn you

are dangerous

all the above

A

All of the above

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2
Q

turbines are equipped with an emergency trip mechanism in the event of a/an

under speed

over speed

overlaod

shut down

A

Over speed

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3
Q

Newtons’ 3rd law states the for every action there is a/an

equal and same reaction

an equal and opposite reaction

change in volume

pressure drop when there is a speed drop

A

An equal and opposite reaction

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4
Q

impulse blades harness the steam energy by

change in pressure

change in direction

change in volume

all the above

A

Change in Direction

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5
Q

when you have no pressure drop across the impulse blading (because of their symmetrical design), there will be no need for sealing on either side of the rotating blades

true

False

A

True

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6
Q

reaction blades

are the same distance apart all the way thru the blading

create a pressure drop

cause the steam to accelerate

both the 2nd and 3rd answers are correct

A

Both second and third answers are correct

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7
Q

reaction turbines may have a velocity compounded impulse section at the inlet of the turbine to help make the turbine machine shorter and eliminate the need for sealing at the high pressure end

true

false

A

True

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8
Q

extraction turbines remove steam from the casing which is used for another plant process

true

false

A

True

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9
Q

condensing turbines use a condenser to increase the turbines efficiency by creating a high pressure back pressure at the outlet of the turbine

true

False

A

False

Reduces the backpressure

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10
Q

many large turbines have bearings with spherical seats which allows the bearing to tilt according to the sag in the turbine shaft

true

False

A

True

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11
Q

the thrust bearing is usually locate in the

steam outlet end

steam inlet end

before the inlet bearing

after the outlet bearing

A

Steam inlet end

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12
Q

carbon seals are used on small turbines and their match marks are installed facing the pressure

true

False

A

True

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13
Q

when thermal growth exceeds the capacity of the labyrinth seals you would use a

carbon seal

tilting pad seal

higher spring pressure

annulus seals

A

Annulus Seal

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14
Q

moment weight is the weight of the blade

plus the radial distance to the center of gravity of each blade

times the shaft diameter of the rotor

times the radial distance to the center of gravity of each blade

the speed of the blade as it rotates around the axis of the housing

A

times the radial distance to the center of gravity of each blade

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15
Q

coupling bolts are marked for each specific location due to

fit

balance

none of the above

both the 1st and 2nd answers are correct

A

Both first and third answers are correct

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16
Q

speed control of turbines is usually controlled by governors under varying load conditions

true

False

A

True

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17
Q

over-speed trips use centrifugal forces that overcome the spring tension and hit the over-speed trip mechanism. these trips must be manually reset

true

False

A

True

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18
Q

the main stop valve shuts off the steam to the turbine

true

False

A

True

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19
Q

the steam turbine chest has a witches hat that keeps particles from entering the turbine

true

False

A

True

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20
Q

the steam supply to smaller impulse turbines should be free of moiture and super heated

true

False

A

True

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21
Q

steam admission valves can be moved or lifted by a cam lift or bar lift that overcomes spring pressure to open

true

False

A

True

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22
Q

thrust controls for a turbines axial movement can be

balance piston

dummy piston

dual flow rotors

all the above

A

All of the above

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23
Q

a turning gear or barring gear is used on large turbines to rotate the turbine rotor(s) from 1 to 60 rpm. this slow turning allows the sag or bow in the rotor to be removed

true

False

A

True

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24
Q

jacking oil is used to lift the shaft off of the bearing surfaces until the rotor gets up to __________rpm. then the main lubrication system will take over and the jacking oil shut off.

10-20

50-60

100-200

500-600

A

50-60 rpm

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25
Q

debris buildup or deposits on turbine blades and nozzles can be removed by using

walnut shells

rice

temperture changes after shutting down the turbine

high pressure dry ice

all the above

A

All of the above

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26
Q

removal of flange nuts in most turbines is accomplished by using

hydraulic stretch of the bolt

heating the bolt internally

torque mulitipliers

all the above

A

All of the above

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27
Q

when lifting of turbine covers, it is important to install the guide pins so the cover can be lifted off level and straight up, eliminating any potential for damage

true

false

A

True

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28
Q

bearing height and position for turbines is adjusted in the pedastal by the addition or subtraction of shims under the bearing seat pads

true

Option 2

A

True

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29
Q

the typical babbitted bearing clearance is about ______ per 1” of shaft diameter

0.001”

0.003”

0.005”

0.010”

A

.001”

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30
Q

oil voscosity for bearings in a turbine is maintained by running them in oil between 0 and 120 degrees C

true

false

A

False

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31
Q

when controlling thrust in a steam turbine, you usually only need 1 location for the thrust bearing so the rotor is free to expand in either direction from it

true

False

A

True

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32
Q

for properly installed diaphragms, you would need to do which of the following

use shims

use crush pins

the halves installed with a slight protrusion

all the above

A

All if the above

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33
Q

when using lead wire to check labyrinth seals clearance, you would use a blade micrometer because it can read into the profie left when squished

true

false

A

True

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34
Q

before installing the blades on the rotor, you need to make sure to check the blades for correct location by checking the match marks or numbers

true

false

A

True

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35
Q

once the bolts are tightened on the flanges for the turbine casing, they can be checked for tightness with ultrasonic testing. (high frequency sound waves)

true

False

A

True

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36
Q

which of the following would give you a false reading on bolt stretch (bolts below the required torque)

lubrication of the threads

heating the stud

heating the flange

tightening the stud to the specified torque

A

Heating the flange

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37
Q

when doing a coupling alignment on a turbine, you will make movement between the _____ and the _______.

foundation, turbine feet

sole plate, base plate

sole plate, turbine feet

base plate, foundation

A

Sole plate and turbine feet

38
Q

piping for the turbine must

be able to handle the ssteam flow

not put strain on the casings

allow for expansion

all the above

A

All of the above

39
Q

turbines are set on the bed of the foundation on

sole plates

grout pads

wedge blocks

all the above

A

All of the above

40
Q

when initial parts are installed for the turbine (bottom halves of the turbine cylinders), they are installed with lubricated keyways that

lock the turbine solidly in place

allow for rotor sag

allow the turbine to expand in all temperature conditions

none of the above

A

Allow the turbine to expand in all temperature conditions

41
Q

when installing the bearing pedestals and turbine cylinders, you need to add the tops of the cylinders and pedestals so the weight resembles the turbines whole weight and helps take the sag out of the cylinders

true

False

A

True

42
Q

a benchmark is the baseline from where all elevations involved in the turbine installation, will be taken from

true

false

A

True

43
Q

when installing bearings, you use a bridge gauge to check bearing wear (helps with the maintenace schedualing) or bearing clearance

true

false

A

True

44
Q

during startup, steam is admitted to the turbine to rotate it on its own power________

after the jacking oil has lifted the rotor

after several hours and when the rotor is straight and up to the proper speed

after a few days and and the rotor is striaight and jacking oil still on

once the baring gear has it up to 50 to 60 rpm

A

After several hours wnd when the rotor is straight and up to proper speed

45
Q

once the steam is first admitted, you should make sure the drain lines are plugged until thermal saturation is reached and that the turbine runs thru any critical speeds as fast as possible

true

False

A

False
Make sure drain lines are all open until just steam comes out

46
Q

the gas turbine is an internal combustion engine that coverts fuel to useable power

true

False

A

True

47
Q

the efficiency of a gas turbine depends on the temperature the air can be raised and the use of cold dense air that will create a marked increase in gas turbine output

true

False

A

True

48
Q

regeneration is when some of the exhaust air from the gas turbine is used in the process to generate steam power

true

False

A

False
Exhaust gas is regenerated to assist in the heating of the gasses before the turbine

49
Q

the gas turbine shaft type that has one shaft running inside the other is

single shaft

split shaft

twin spool shaft

direct coupled

A

Twin spool shaft

50
Q

in the gas generation section, the main parts are the compressor and combustion chamber

true

False

A

True

51
Q

the power section of a gas turbine harnesses energy from the cold gasses as efficiently as possible

true

False

A

False
Harnesses hot expanding gases

52
Q

in the split shaft turbine design, the gas generation turbine is connected to the compressor and the power turbine is connected to the load.

true

False

A

True

53
Q

the gas turbine cycle that uses a heat exchanger or regenerators to make it more efficient is

open cycle

semi-closed cycle

closed cycle

all the above

A

Semi Closed cycle

54
Q

in the regeneration cycle, the turbine uses exhaust heat to assist in heating and expansion of the gases after the compressor but before the combustion chamber

true

False

A

True

55
Q

one of the greatest advantages of the gas turbine is its power to weight ratio

true

False

A

True

56
Q

one of the major disadvantages of the gas turbine is its low thermal efficiency

true

false

A

one of the major disadvantages of the gas turbine is its low thermal efficiency

true

false

57
Q

in the gas turbine, the compressor increases the air pressure and air temperature until it hits the diffuser. here the air velocity is slowed down and the air pressure decreased

true

False

A

False

Lowers the velocity and increase the pressure

58
Q

the air pressure during ignition is always higher than in the diffuser when travelling thru the turbine.

true

false

A

False
Diffuser has the highest pressure

59
Q

the turbine is attached to the compressor by a shaft running thru the turbine engine and about ____ of the power developed by the gas turbine is used to drive the compressor and accessories

25%

50%

75%

10%

A

75%

60
Q

if gases back up into the compressor, it will lead to a condition of compressor surge or stall

true

false

A

True

61
Q

air filtration for stationary gas turbines can use spiral vane seperators and V-bag filters

true

false

A

True

62
Q

pulse type filters are used to reduce icing and hoarfrost build-up

true

false

A

True

63
Q

to improve air flow at the intake, you would use

dense filtering

sharp bends in piping

guide vanes

none of the above

A

Guide Vanes

64
Q

in the combustion chamber housing, the ingniter is in the

primary zone

intermediate zone

dilution zone

fuel nozzle zone

A

Primary Zone

65
Q

primary air is used for mixing with the fuel

true

False

A

True

66
Q

the secondary air is used to control the temperature and also help in the combustion process

true

false

A

false
Only control the temperature by moving air around the outside of the liner

67
Q

the transition piece makes sure that all hot gases are mixed with air so there is no hot gas pockets

true

False

A

True

68
Q

when using can type combustion chambers, every chamber will need its own igniter

true

False

A

True

69
Q

the fuel nozzle or injector is used to spray the fuel in a fine mist or vapourize the the fuel

true

False

A

True

70
Q

the turbine assembly harnesses the power of the hot expanding gases and has blades and nozzles made of mild steel

true

False

A

False

Made of high strength steel

71
Q

you can increase the endurance of the nozzles, by adding new alloys such as ceramic or use air cooled nozzle vanes

true

false

A

True

72
Q

the rotor blades on the rotor discs can have clearance when mounted, so that they can allow for thermal expansion

true

False

A

True

73
Q

labyrinth seals are used on both compressor and turbine and can have help for sealing from sealing jets of air routed from the compressor section

true

false

A

True

74
Q

a starting motor is an essential auxiliary component that needs to route the turbine to about _____% of its maximum speed

10

20-30

40-50

60-70

A

20-30%

75
Q

power loss in a gas turbine can be caused by dirt deposits on the compressor blades

true

False

A

True

76
Q

to check for interference and rubbing between air seals and blades, you would need to manually turn the engine over slowly

true

False

A

True

77
Q

when replacing blades on a turbine with new blade, you must make sure

the blade has the same moment weight.

the blade has the same type of mount.

you use proper installation procedures set out by the manufacture.

all the above

A

All of the above

78
Q

when doing an engine wash, you would do it only when using the starting mechanism, not while it is running

true

false

A

False
About once a month a cleaning solution is sprayed into compressor blades while it is running

79
Q

in regards to the inlet or intake system on a gas turbine, a 1 % loss in intake pressure results to about ______ % loss in engine power

1

2.5

5

10

A

2.5

80
Q

insulation (thermal) can be used on turbines to help with personal protection, noise reduction and operational efficiency of the turbine

true

False

A

True

81
Q

after replacing a governor with a new one, the millwright needs to fill the governors reservoir with the correct oil and adjust the speed at start up

true

False

A

True

82
Q

a governor will automatically control the speed of a prime mover under varying load and can also

maintain the selected speed

limit the slow and fast speed

shut down the prime mover if it over speeds

all the above

A

All of the above

83
Q

all automatic governor control systems have 3 main components

detection, transmission, maintenance

detection, ignition, correction

detection, transmission, correction

transmission, correction, maintenace

A

Detection, transmission, correction

84
Q

in spark ignition, the governor actuates a throttle valve in the intake passage between the carburetor and manifold. the governor operates off the engine vacuum to move the throttle valve

true

False

A

True

85
Q

the mechanical governor can use centrifugal force to activate it

true

false

A

True

86
Q

because of high rotational speeds in steam turbines, it is important that the speed be accurately controlled by 2 systems. operation speed control and over speed control

true

false

A

True

87
Q

large steam turbines require intermediate devices to amplify the governors signal into a force powerful enough to operate the control valves. these devices can be

hydraulic

electronic

pneumatic

all the above

A

All of the above

88
Q

the governor on a gas turbine is used to monitor the turbine speed and load and adjust the fuel supply accordingly

true

false

A

True

89
Q

isocronous control of a governor will keep a constant speed without fluctuation

true

False

A

True

90
Q

variable speed control uses centrifugal fly weights and the speed is adjusted by changing the spring pressure that opposes the fly weights

true

False

A

True

91
Q

hunting is a problem with some governors. it is the quick action of the governor to the driver speed, causing a to fast, to slow, to fast, to slow cycle. to help alleviate this problem, you would have a governor with speed droop

true

False

A

True

92
Q
A

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