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Fourth Year Millwright 2018 > Important Things to Know > Flashcards

Important Things to Know Flashcards

1
Q

What is the turbine called that has HP and LP section on separate shaft?

A

Cross Compound

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2
Q

The greatest amount of steam expansion takes place in the?

A

LP Stage

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3
Q

On a reaction turbine the largest blades are in the?

A

LP Reaction

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4
Q

Gas turbines have the highest pressure in the?

A

Compressor Diffuser

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5
Q

Emergency blowdown valves prevent?

A

Over Pressuring the system

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6
Q

what does large diameter steam blading allows for?

A

High Volume Of Steam

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7
Q

What is used to help prevent steam leakage from blade sections?

A

Shrouding or Shrouds

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8
Q

Condenser in the turbine allows steam to perform more work by reducing pressure and?

A

Less Back Pressure and Recycle Condensate

Time more efficient

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9
Q

S.A.V is closed by?

A

Governor

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10
Q

Is the overspeed trip mounted on the rotor shaft?

A

Yes, the bolt has the center of gravity slightly of center of the shaft.

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11
Q

What is the first step in starting a gas turbine?

A

Start button but always follow Manufactures Pre-startup Checks

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12
Q

The transition piece connects the inner lines of the power plant combustor to?

A

Combustion chambers to the turbine and it’s duct.

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13
Q

What do the moving blades of the turbine consist of?

A

Disc or Drum Wheels

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14
Q

Name for stationary blades?

A

Nozzles

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15
Q

For expansion on turbines sliding dovetails are used?

A

On rotors for holding reaction blades

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16
Q

Spherical bearings used on turbines to?

A

To compensate for sag on shaft

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17
Q

Carbon rings are machined because they?

A

Fit with very close tolerance

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18
Q

On a gasoline carburetor how is the amount of gas delivery controlled?

A

(Butterfly Valve) Throttle Valve

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19
Q

Propane and most carbs used a?

A

Spray Bar or Nozzles

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20
Q

Excessive crankshaft deflection will most likely cause?

A

Broken crank or fatigue failure

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21
Q

What is a micron?

A

Millionth of a meter

.001 mm

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22
Q

What does a magneto ignition system consist of?

A
  • Magnets
  • Coil (transformer)
  • Spark Plug
  • Generates its own power
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23
Q

On a 4 stage cycle engine, intake valves opens and closes once, while the crankshaft turns how many degrees?

A

720°

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24
Q

What is artificial respiration when dealing with stationary engines?

A

Air is forced in to the cylinder

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25
Q

What controls the collapse of the primary field of the coil on an electric ignition system?

A

Transistors

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26
Q

Lacing is used in what section of the turbine?

A

LP Section

Reaction Blades

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27
Q

Labyrinth seals, seal on the principal of?

A

Bernoulli Principle

Knife edges

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28
Q

You start up a piece of equipment after an overhaul you get very high vibration readings, the next step is to?

A

Shut it down!

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29
Q

If you get fluctuations readings when you first start the equipment, wait for readings to settle, this is known as?

A

Hunting

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30
Q

On electric motor, vibration readings are highest in the axial direction, the problem is most likely?

A

Misalignment

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31
Q

Drive belt vibrations amplitude is most likely the highest in-line with?

A

Direction of belts, because they are pulling on the sheave

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32
Q

When taking vibration readings on bearings, the readings should be taken on?

A

Acceleration and on the Horizontal, vertical, and Axial

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33
Q

vibration signals are also known as?

A

Signatures

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34
Q

What is the cause of too low suction lift?

A

blocked intake

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35
Q

If you are taking vibration under 600 rpm use?

A

Displacement

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36
Q

Everything is working the way it should but the input light never comes on?

A

Bulb burnt-out or the switch is bad

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37
Q

How is the suction and discharge valves operated?

A

by pressure differential of the pump

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38
Q

Where does maximum impeller wear widely with semi fluids solids?

A

Blade tips

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39
Q

Two major types of seals used in pumps?

A
  • Static

* Dynamic

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40
Q

What is the advantage of wear rings in centrifugal pump?

A

Increase efficiency prevent recirculation

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41
Q

When pumping clear unconcentrated H2O (water) with constant pressure suction side of pump, the stuffing box should work well with what kind of packing?

A

Solid Packing

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42
Q

What is the major reason for using steam throttle valves on large pump?

A

Direct connected valves require too much force

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43
Q

What can be done to modify a reciprocating pump to make it provide a steady and continuous flow?

A

Add air chambers to outlet side.

Accumulator

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44
Q

What happens when discharge valve is close on a centrifugal pump?

A

Pump Slip

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45
Q

Gate valves are used as intake and discharge valves because of?

A

Low Pressure Loss

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46
Q

7:1 compression ratio, what is most likely cause of pre-ignition?

A

Carbon deposits glowing red cause.

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47
Q

What is gear mesh frequency of a single gear reduction gear box with an input speed of 3600 rpm and output speed of 1060 with 24T.pinion

A

1440 hz

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48
Q

What is cause of too low suction lift?

A

Blocked Intake

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49
Q

What precautions is to be observed when handling and installing mechanical seals?

A

keep fingers away from the face of the seal

any damage with the seal face

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50
Q

Which process is used to seal mechanical seals in an emergency?

A

Lapping

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51
Q

How do you bring coil packing down to exact size?

A

Roll it with a piece of pipe (or monery) and cut all at once

52
Q

How do you bring coil packing down to exact size?

A

Roll it with a piece of pipe (or monery) and cut all at once

53
Q

When installing packing rings the joints should be installed?

A

90° to each other

54
Q

What safety precaution is observed when working on a conveyor to make sure it does not start while you are working on it?

A

lock and tag (test start button)

55
Q

What is the function of an electrical interlock to enable system shutdown anywhere along the line?

A

Times the functions

56
Q

What is the probable cause of gravity take-up system that slips on start-up?

A

Take-up weight to light

57
Q

On a belt conveyor that must be started under full load, what kind of drive should be used?

A

fluid coupling

58
Q

What chain is best used in abrasive conditions?

A

mill chain or H-type

59
Q

On an overload conveyors with a compound vertical curve the purpose of the straight section of track is?

A

to gain the required amount of elevation

60
Q

On a long screw type conveyor sections of screws are joined by?

A

coupling or dungeon shaft

61
Q

A belt that has a section of it that always runs out of alignment is probably caused by?

A

Improper or Uneven splice

62
Q

Increasing coefficient of friction on drive pulley without increasing tension, can be accomplished by?

A

lagging

Snub-pulley= arc of contact

63
Q

Easiest way to change speed at a conveyor?

A

Change sheave or sprocket diameter

64
Q

On a bucket elevator the length of splice should be?

A

equal to the width of the belt

65
Q

On pneumatic dust conveyor piping the amount of wear is?

A

on outside radius of elbow

66
Q

If the diameter of the snub pulley is too small

A

adjustment will not allow for proper arc of contact

67
Q

Millwright measures electrical pressure with what kind of meter?

A

volt meter

68
Q

What steps up or down voltage?

A

transformer

69
Q

Bearings on electric motor lock bearing at what end?

A

drive end

70
Q

Most common way to reverse direction at DC motor

A

reverse armature lead

71
Q

Balancing of 3 blade for imbalance of 85°

A

SIN LAW

72
Q

Who is responsible for providing MSDS

A

supplier

73
Q

Foot valve

A

on a centrifugal pump

74
Q

Regenerative pump

How do you know it is one?

A

The way its mounted and the housing

75
Q

pump curve question

A

10.7 psi gauge pressure

76
Q

alignment question

A

Line # 1

77
Q

Which one is the Lowest pressure from first to fourth stage

A

fourth stage is the lowest pressure

78
Q

gate valves

A

are used because they are low pressure drop

79
Q

butterfly valve

A

for lowest pressure drop

80
Q

pressure drop

A

across both blades in a reaction turbine

81
Q

belt stretch

A

from overloading

82
Q

driven gear

A

on picture

83
Q

balancing device on what?

A

single suction

open closed

84
Q

diaphragm pump

A

2 pressure limiting valves two diaphragms

85
Q

rotating part

A

sleeve

86
Q

low npsha

A

suction is clogged

87
Q

measure clearance

A

tdc on compression

88
Q

condenser

A

to increase pressure drop

89
Q

to maintain straigth flow in an axial pump

A

diffuser vane

90
Q

how to attach long screw conveyor

A

couplings (dungeon)

91
Q

conveyor that moves cylindrical objects

A

hour glass

92
Q

cyclone moves material apart by

A

centrifugal

93
Q

where is the intercooler with a turbo

A

after the outlet of the turbo

94
Q

most wear in a pipe elbow

A

outside radius

95
Q

blade on fan

A

6 or 7 weight on 120 degrees

96
Q

how much ounce weight do you add to balance out

A

1.7 ounces

97
Q

Phase are the same

A

Static

98
Q

coil on distributor

A

primary voltage

99
Q

semi closed impeller

A

on other picture

100
Q

idlers spaced

A

for belt sag

101
Q

shaft sleeve used

A

save on shaft costs

102
Q

Your employer wants you to do computer training in addition of technical training?

A

Contact LAC

Local Apprenticeship Committee

103
Q

where to put thermo couples

A

each end of turbine

104
Q

camshaft changes

A

linear motion to rotational motion

105
Q

holds belts together

A

Friction

106
Q

how does cooling tower remove heat

A

By Air

107
Q

Excessive crankshaft deflection

A

Fatigue Failure or Broken shaft

108
Q

Emergency blow down valves

A

prevent over pressuring

109
Q

Brass ring in packing

A

lantern ring

110
Q

impeller wear

A

blade tips

111
Q

types of seals used in pumps

A

dynamic and static

112
Q

when pumping clear uncontaminated h2o water

A

used solid packing

113
Q

unbalanced pump

A

off center in a concentric housing

114
Q

best chain to use in abrasive conditions?

A

mill chain

115
Q

blow by

A

oil leaking into the crankcase

116
Q

in an emergency

A

lap mechanical seal

117
Q

overspeed trip on turbine

A

110% to 115%

118
Q

measure stroke

A

distance from BCC- TDC

119
Q

how do you measure growth

A

with laser, optical, etc

120
Q

axial growth in a turbine is controlled with

A

a key

121
Q

tenon

A

shrouds - tip of the blade?

122
Q

full load to no load

A

speed droop

123
Q

To change the operating speed (rpm) on the governor

A

Adjust the spring

124
Q

troubleshooting question

A

systematic approach
ask good question
do one thing at a time

125
Q

maintenance on a valve stem

A

tighten nut

126
Q

how is shroud attached?

A

it’s riveted in sections over a tenon

127
Q

what is the critical speed of a rotor?

A

Is determined by it’s natural frequency. At this speed the motor will shake violently. The machine must accelerate quickly through the critical speed to avoid this

Fourth Year Millwright 2018 (15 decks)

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