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Fourth Year Millwright > TQ 4th period > Flashcards

TQ 4th period Flashcards

1
Q

Bent Shaft produces the highest vibration at?

A

1X rpm

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2
Q

Misalignment can be distinguished from an imbalance vibration because?

A

Axial readings will be high compared to radial

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3
Q

Which condition will produce a frequency less than 1x frequency?

A

Oil whirl

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4
Q

High axial readings showing a 180 degree change of phase between bearings is an indication of?

A

Bent shaft

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5
Q

Velocity is used as a measurement of vibration frequency in the range of?

A

600 to 60,000 cpm

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6
Q

Phase readings are expressed in?

A

Degrees

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7
Q

For vibration measurements which device converts mechanical vibrations into electrical signal?

A

Velocity transducer

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8
Q

Rigid rotor is one that which operates?

A

Considerably below its first critical speed

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9
Q

The frequency of vibration caused by an imbalance would be?

A

1x the rpm

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10
Q

Displacement is measured as?

A

Mills peak to peak

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11
Q

Velocity is measured as?

A

Inches per second, peak

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12
Q

Acceleration is a rate of change of?

A

Velocity

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13
Q

The vibration characteristic referring to a type of resonance which occurs in a rotating machine component revolves at a speed close to its natural frequency is known as?

A

Critical speed

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14
Q

A gradual deviation from a desired governor speed would be known as?

A

Speed drift

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15
Q

Direct acting mechanical type governors utilize?

A

Centrifugal forces and mechanical linkage to operate SAV (Steam admission valve)

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16
Q

The governor characteristic that requires a specific speed decrease before the governor tries to give an increase in throttle is called?

A

Speed droop

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17
Q

The purpose of the mechanical flyball governor is to?

A

Maintain the selected speed

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18
Q

The governor that will keep a large diesel running at a constant speed regardless of varying load is called?

A

Isochronous

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19
Q

When a steam turbine is reaching top speed the flyweights on the governor will?

A

Be moving away from center increasing the force acting on the speeder spring

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20
Q

The dilution zone on a gas turbine combustion chamber is where?

A

secondary air is mixed with the burnt gases.

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21
Q

When a gas turbine exhausts to a heat recovery steam generator it’s called?

A

Cogeneration

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22
Q

Which type of gas combustors must be equipped with their own igniters?

A

Can type

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23
Q

What will cause the most pitting wear on the blades of a gas turbine?

A

Unburned liquid fuels

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24
Q

Turbine sections of a gas turbine has fewer stages than the steam turbine because?

A

The pressure drop is smaller.

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25
Q

The spherical seats used on radial bearings on large speed turbines allow for?

A

Fairing movement of the shaft if there’s any deflection

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26
Q

A large industrial steam turbine that is Cross compounded would have?

A

The shafts running parallel to each other

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27
Q

The purpose of the jacking oil pump on a large steam turbine is?

A

To lift the rotor off the bearings before starting to rotate the shaft

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28
Q

In a gas turbine the majority of the compressed air from the compressor is used?

A

To supply secondary cooling air

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29
Q

The highest air pressure in a gas turbine engine will be found in the?

A

Diffuser

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30
Q

The efficiency of a gas turbine depends primarily on?

A

The temperature that the air can be raised to.

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31
Q

Labyrinth seals in a steam turbine operate on the principle of?

A

Turbulent flow forming a pressure drop across each knife edge

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32
Q

One method commonly used to balance the thrust on the low pressure section of a reaction type steam turbine is to?

A

Have a double flow design casing

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33
Q

What is used to reduce the amount of steam leaking past the tips of the rotor blades?

A

A shroud with a labyrinth seal

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34
Q

The clearance specified by the manufacturer on carbon ring seals on a steam turbine will be most affected by?

A

Operating temperature

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35
Q

Carbon rings are efficient because?

A

There is only a small clearance between them and the shaft

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36
Q

A vortex in the suction reservoir can be caused by?

A

Incorrect suction pipe submergence in the suction reservoir.

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37
Q

Double suction pumps will require _________ seals for operation.

A

2

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38
Q

The purpose of having tilting pads on a kingsbury thrust bearing its to?

A

Allow each pad to form an oil wedge

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39
Q

In the reaction turbine there will be a pressure drop across?

A

Moving blades with a velocity increase across the fixed

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40
Q

The purpose of the barring gear found on a large steam turbine is?

A

To reduce the chance of bowing the rotor after shutdown

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41
Q

When referring to centrifugal pumps the term net positive suction head available is?

A

The pressure that remains after vapour pressure, suction pressure and all losses have been subtracted

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42
Q

Cavitation could be caused by?

A

Anything that impedes the flow on the suction side

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43
Q

High speed and regenerative pumps will produce

A

High heads and low flows

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44
Q

As a rule of thumb the maximum amount of wear ring clearance is?

A

3x the initial clearance

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45
Q

In a multi -stage deep well pumps _____ _______ impellers are often used

A

Mixed flow

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46
Q

If the discharge valve on a centrifugal pump is closed while the pump is still running what would happen?

A

Internal slippage would allow the impeller to still turn fluid.

47
Q

A pump operating in high elevations would be susceptible to?

A

Cavitation

48
Q

Which type of load is balanced with a double volute casing?

A

Radial

49
Q

How many pump strokes are there in a complete cycle of a double acting duplex reciprocating pump?

A

4

50
Q

A Pump suddenly does not deliver fluid at the rate of discharge pressure, becomes noisy but there is a good supply of fluid at the reservoir. What maybe the problem?

A

Suction line may be plugged.

51
Q

The priming of a centrifugal pump before start up is often necessary because?

A

It is necessary to create the pressure at the eye of the impeller

52
Q

The major advantage of a crown pulley is?

A

It will help to hold the belt on center.

53
Q

A troughing conveyor belt will?

A

Increase carrying capacity

54
Q

Which method would be best suited for making a temporary repair on a torn belt?

A

Double plate fasteners

55
Q

A tripper is?

A

Used to unload a belt

56
Q

A pneumatic conveyance system with rotary vane gears prevent?

A

The air from entering material inlet chute

57
Q

What would be used to increase the arc of contact on a slipping drive pulley?

A

A snub pulley

58
Q

When the material to be conveyed contains large lumps the impact on the belt can be reduced by the use of?

A

Grizzly chute

59
Q

For curves in a roller conveyor bed the best type of roller to use?

A

Tapered roller

60
Q

Rigid side guide idlers should be set up so they prevent?

A

The belt wearing on any fixed surface

61
Q

The minimum number of rollers under a product on a rolling conveyor is?

A

3

62
Q

The method of conveyance that uses a cushion of air to convey material is?

A

Gravity air slide

63
Q

One sign of blocked crankcase vent line or breather would be?

A

Excessive oil consumption

64
Q

Which engine fuel system would use a spray bar in the fuel delivery system?

A

LPG

65
Q

While checking main bearing clearances in an integral engine compressor set must be?

A
  • flywheel pinned and locked.

- fuel and starter system locked.

66
Q

The natural gas engine has an elevated exhaust temperature this could be caused by?

A

Incorrect air fuel mixture

67
Q

The result of a misaligned con-rod can be?

A

Excessive oil consumption

68
Q

Bearing crush allows for?

A

Good heat transfer

69
Q

Valve clearances on a 4 stroke engine are normally adjusted with the piston?

A

TDC on compression stroke

70
Q

Excessive clearance between your position ring and piston groove can cause?

A

Broken rings

71
Q

Too little valve clearance in the exhaust may cause?

A

Burnt valves

72
Q

As the valve seat wears in on the exhaust valve?

A

Tappet clearances will be reduced

73
Q

A roots blower on a 2 stroke engine is driven how?

A

Mechanically driven

74
Q

Black smoke and loss of power being noticed on a large stationary Diesel engine the likely problem is?

A

Injection timing is out

75
Q

Purpose of the lubrication system on a large engine would be?

A
  • clean, lubricate, seal and cool

- absorb shock loading.

76
Q

On a low tension electronic type magneto system uses the ____________ to discharge the system.

A

Capacitor

77
Q

With electronic ignition systems distributor type switching of primary circuit is done with?

A

Transistors

78
Q

Multiple engine systems coupling the exhaust systems together is?

A

Not recommended

79
Q

Which fuel has your highest BTU rating?

A

Diesel

80
Q

The higher the octane rating the?

A

Less chance of detonation

81
Q

Excessive valve clearance in an engine could cause?

A

A change in timing

82
Q

Installing a thinner head gasket on an engine could result in?

A

An increase in power and an increase in compression ratio

83
Q

After honing what would be the best to clean a cylinder with?

A

Hot soapy water

84
Q

Excessive crankshaft deflection would likely be caused by?

A

An engine improperly shimmed to the base plate

85
Q

Counter weights bolted to the crankshaft in a large stationary engine are there to?

A

Counter act the reciprocating forces of the pistons and con-rod

86
Q

On a 12 cylinder 4 stroke engine the engine must have how many revolutions for all cylinders to fire?

A

2

87
Q

Rotation of a 3 phase motor can be changed by ?

A

Interchanging any of the 2 leads

88
Q

Emergency stop switches are?

A

In series with control relays and are normally closed

89
Q

Which program is a timed based maintenance program?

A

Preventative maintenance

90
Q

Why would a root cause analysis be performed?

A

Find out why a machine failed.

91
Q

When you make a change to piece of equipment, where does the information need to be entered?

A

CMMS

Computerized maintenance management system

92
Q

In doing a rim and face alignment the face reading can indicate?

A
  • angular misalignment

- axial float

93
Q

A strain gauge can be used to measure?

A

Crankshaft deflection

94
Q

When a piston on an engine travels from the Top Dead Centre position to the Bottom Dead Centre position and takes on fuel, the piston has traveled thru the ____________ stroke.

A

Intake

95
Q

The type of turbine governor that senses speed through the volume of oil per revolution is that?

A

Hydraulic governor

96
Q

The harmonic balancer is mounted on the _________ of the crankshaft.

A

Nose

97
Q

The type of air filter that throws the dirt particles outward and into a collector is the ___________ cleaner.

A

Spiral Rotor air cleaner

98
Q

As a General rule an engine requires ___________ cfm of air per rated horsepower.

A

2.5

99
Q

An electric speed sensing governor used on an electric generator will monitor the?

A

Frequency of the current produced

100
Q

Gas turbines use _________ seals on both the compressor and the turbine.

A

Labyrinth seals

101
Q

If there is too little valve to stem clearance on an engine valve it could result in?

A

Valve sticking

102
Q

With phase angle measurement using a vibration probe, the distance that the heavy spot move past the pick up before the flash occurs is the?

A

Flash angle

103
Q

A common approach for selecting trial weight is to use a weight that will produce an imbalance force at the support bearing equal to ________% of the rotor weight supported by the bearing.

A

10%

104
Q

When using a gas lubricated seal the _________ should be taken into consideration.

A

Corrosive properties of the liquid.

105
Q

When troubleshooting the operation of a pump, the net clear area of the strainer on the suction line should be__________ times the area of the suction line.

A

4

106
Q

When referring to pulsation dampers, which style normally has a low level limit switch as part of the damper?

A

Non-separated

107
Q

What type of belt is usually used with electric motors with a separate speed reducer?

A

V-belt

108
Q

A _________ Pitch used as feeder screws to provide for uniform withdrawal of fine material along the entire length of the screw.

A

Variable

109
Q

The term specific gravity is the?

A

Ratio of the density of a substance compared to the density of water

110
Q

Steam turbine has?

A

External combustion engine

111
Q

Excessive connecting rod bearing clearances would cause?

A

Blue Smoke

112
Q

Carbon mechanical seal is?

A

Low friction, economical

113
Q

PTFE wedge is a?

A

Pusher seal

114
Q

Which gas requires a computerized control system?

A

Methane

Fourth Year Millwright (5 decks)

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