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Millwright Level 4 > Prime Movers > Flashcards

Prime Movers Flashcards

1
Q

In bearing boars, the measurements should be taken and recorded. In These Positions

A

Vertically and horizontally.

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2
Q

You measure a bore in.____ positions determine if the main bearing Bores are Circular without taper and the correct size. The size ensures that the bearing has the correct crush.

A

3

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3
Q

Some of the methods used to treat the inside of cylinder liners in order to reduce the rate of wear are

A

.Induction hardening
.Hard chrome
.Nitriding

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4
Q

________ Are sleeves that fit inside the cylinder boar and do not contact the engine coolant.

A

Dry liners

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5
Q

_____ Are in contact with the coolant and form part of the water jacket.

A

wet liners,

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6
Q

_____ Have cooling fins that surround the Outer diameter of the cylinder.

A

Air cooled liners

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7
Q

_____ Liners that feature porting on them near the middle of the cylinder are used on 2 stroke engines.

A

Porting

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8
Q

It is normal for liners to have Ware concentrated in a Pacific area. The tendency is for the liner to wear in A.______

A

Tapered fashion

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9
Q

Most of the wear on a liner occurs towards the

A

Top of the liner near the upper limit of the ring travel

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10
Q

Most of the wear on the liner occurs on the

A

major thrust side when cylinder pressure and temperature are at maximum.

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11
Q

______ converts the downward linear motion of the piston to usable rotary motion

A

Crankshaft

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12
Q

_______ is used when a cylinder has a ridge above the ring travel

A

Ridge reamer

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13
Q

Removing the ridge on a cylinder under _______ in diameter is accomplished with a hand operated ridge reamer

A

6in (150mm)

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14
Q

A pattern 40* to 60* honed in a cylinder is called

A

Cross hatch pattern

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15
Q

Cross hatch pattern is

A

40 to 60 degrees

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16
Q

After honing or deglazing use a _______________ to clean the cylinder

A

Bristle brush and hot soapy water

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17
Q

Do not use __________ to clean cylinders because it it do not thoroughly flush the material and abrasive from microscopic grooves

A

Solvents

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18
Q

To check cleanliness of the bore ________

A

Wipe with a lightly oiled lint free white cloth

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19
Q

The most important part of liner installation is that the liner bores should be _________ same as integral cylinder for maximum diameter, out of round and taper

A

Measured

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20
Q

You should put a bead of high temperature______________under the top liner flange in order to ensure a leak proof seal

A

Room temperature vulcanizing (RTV) sealant

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21
Q

Before cleaning a crankshaft______

A

Remove the oil gallery plugs and reinstall them upon completion

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22
Q

Before storing the Crack apply a _________ and stand the crank on its end for larger and longer cranks store them_____________

A

Corrosion inhibitor or grease on the crank

Laying flat in a crate but supported by V blocks on the main bearings

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23
Q

_______ are sometimes referred to as a balancers or harmonic balancers

A

Vibration dampeners

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24
Q

Vibration dampeners are sometimes referred to as balancers or

A

Harmonic balancers

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25
Q

The purpose of a vibration dampeners is to_____

A

Reduce crankshaft torsional vibration

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26
Q

Most bearings have ______________ that is compatible with the shaft and the operating conditions of the engine

A

A steel backing with a layer or several layers of material

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27
Q

Engine bearings are usually one of two types

A

Sleeve or shell

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28
Q

_______ are one piece bearings that are often called bushings

A

Sleeve bearings

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29
Q

_____ are two piece bearings which allows for easier removal and replacement

A

She’ll type bearings

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30
Q

____ is the most accurate method of checking the bearing clearance but also the most time consuming

A

Measurements

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31
Q

______ measure the bearing clearance by using a dial indicator and hydraulic jack

A

Bearing lift check

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32
Q

Bearing lift checks measure the bearing clearance by using

A

Dial indicator and a hydraulic jack

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33
Q

The most common cause of bearing failure is ________

A

Lack of lubrication

34
Q

The second most common cause of bearing failure is

A

Lubricant contamination

35
Q

Lubricant contamination can be caused my

A

Dirt,water,antifreeze, fuel and acids formed from blowby or fuels

36
Q

In the_____ method, the bolt length is measured before tightening

A

Bolt stretch (elongation)

37
Q

Never use chrome faced rings in ______

A

Chrome plated liners

38
Q

Any dots or lettering on the ring should be facing ____

A

Facing up

39
Q

If the piston ring have a bevel inside it should face _____

A

Up

40
Q

Most of the turbines are covered with insulation. Called _____ In order to retain heat and protect personnel

A

Lagging

41
Q

Turbones are equipped with an emergency._____ to Shut off the steam in the event of_____

A

Trip mechanism
Overspeed

42
Q

If a fluid either liquid or gas flowing through a tube Rachel’s a constriction or narrowing of the tube. The velocity of fluid flowing through the constriction increases and pressure decreases. Also, when the fluid leaves the construction, the velocity decreases and the pressure increases. This is called ______

A

Bernoullis principle

43
Q

2 different turbone blades are.

A

reaction blades
Impulse blades

44
Q

___ Blades are not symmetrical, and they look like an air foil.(wing)

A

Reaction blades

45
Q

When the steam is released against the turbine blades, the total energy available from the steam is due to it’s heat, weight, pressure and velocity, this is called the.

A

Enthalpy of the steam

46
Q

_____ Are arranged to direct the expanding steam toward the blades at the best angle Is it possible to harness the steams energy

A

Nozzles

47
Q

______ Harness the steam’s energy by changing its direction. they are symmetrical and parallel to the shaft’s axis arranged around circumference of the wheel.

A

Impulse blades

48
Q

_________ Is the removal of steam From the Turbine through the casing at various points. Steam is extracted at 1 or more points depending on the pressure level required.

A

Extraction

49
Q

Condensing turbines exhaust steam to a _______

A

Condenser

50
Q

The _____ is a heat exchanger that turns the steam back into hot water

A

Condenser

51
Q

________ Steam turbines are more efficient than non condensing turbines due to less backpressure and recycled condensate

A

Condensing

52
Q

The _________ Is mounted to the top of the turbine casing expose to the internal steam pressure? It is a warning device which indicates if the turbine casing has excess pressure. This device is only found on small impulse turbines.

A

Sentinel valve

53
Q

_____ Consist of a set of knife edged fitting close to a journal like section of shaft.

A

Annulus seals

54
Q

During normal operation a Spring holds the tripping leaver in position when the turbine speed increases to the trip setting usually _____ of operating speed

A

110%-115%

55
Q

Small generators are_____ larger Generators are cooled with.

A

Air cooled
Hydrogen

56
Q

The turbine can be shut down dismantled and the deposits Removed by manual buffering, scraping or blasting them with ____

A

Walnut shells or rice or high pressure dry ice

57
Q

The acceptable range for oil discocity entering the bearing occurs when the oil temperature is between_________ And exit the bearing at about _______

A

105F-140F
130F-160F

58
Q

The diaphrams are lowered into place and checked for their proper location of fit. They need to be secure in the housing and have the specified clearance. Above, Below and on each side of the road, if there is any rubbing on the rotor damage occurs immediately. A _____ can be used to determine clearance

A

Laser unit, piano wier,or dummy shaft

59
Q

When all internal parts of the turbine lower casing are installed at a line, the final seal clearance to rotor location can be checked one method for checking rotor. 2 labyrinth seal clearance is by._______ using

A

Lead wier

60
Q

The foundation of the turbine should be isolated from the other building floors, it should be at least.______

A

2.5 times the mass of All the turbone assembly so that it does not move and helps dampen vibrations from the machine.

61
Q

_________ is when some of the exhaust heat is used to heat the air of combustion

A

Regeneration

62
Q

________ is when exhaust heat is used to generate steam for power generation of other plant processes

A

Cogeneration

63
Q

_________ is to improve the thermal efficiency of the gas turbine by using the exhaust heat (wast) to assist in the heating and expansion of the gases before the turbine

A

Regeneration

64
Q

There is no reciprocation motion in the ___________

A

Gas turbine

65
Q

There is no reciprocating motion in the gas turbine this reduces_______

A

Wear and vibration

66
Q

Gas turbine can be started very _______ with no harmful effects to the engine and can be shut down in a reasonably short time

A

Quickly

67
Q

_________ is air that enters the combustion liner (flame tube) to be mixed with fuel and burnt

A

Primary air

68
Q

_______ is air that has no part in the combustion process

A

Secondary air

69
Q

_______ connects the combustion chamber to the turbine and is a duct or passage long enough to mack sure the hot air is thoroughly mixed so there are no remaining hot gas pockets

A

Transition piece

70
Q

The _____ type chamber is most often used on engines with centrifugal compressors

A

Can

71
Q

______ are used with axial flow compressors. They have one housing around the shaft and one undivided liner inside the housing

A

Annular type chambers

72
Q

The _________ chamber is a combination of both can and annular types. They are used with axial flow compressors

A

Can annular

73
Q

The gas turbine must be rotated to about __________ of its maximum speed before the fule is turned on

A

20% to 30%

74
Q

The __________ purpose is to control the turbines speed automatically under varying loads

A

Governor control

75
Q

The _______ provides automatic registration of fule and compressor vanes for both starting and normal operation of the gas turbine

A

Governor control

76
Q

The Highest temperature on the unit is found at the point where the heated air leaves the ______

A

combustion chamber

77
Q

Defective fuel control ignition is the usual reason for Failure to start. Most engines have ______ igniters for ignition even though there may be a greater number of combustion chamber

A

1 or 2

78
Q

The octane rating refers to the ability of the fuel to

A

Resist ignition due to compression

79
Q

The gasoline fuel system uses a liquid fuel that must be _____ with air before it enters the engine cylinders

A

Metered and atomized and mixed

80
Q

A major component in the system is the converter/regulator also called a

A

Vaporizer

Millwright Level 4 (9 decks)

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