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Millwright > Power Transmission > Flashcards

Power Transmission Flashcards

1
Q

Calculate the accurate belt length for the following: The large diameter pulley is 11.25” and the small diameter pulley is 6.125” shaft centers are 17.5” apart.

A

62.28

D+d/2 × Pi + (2×c)

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2
Q

The clearance of meshing gears of any diametral pitch is known as what?

A

Back Lash

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3
Q

A Babbitt bearing percentage refers to its area of contact. This is found by what method?

A

Bluing

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4
Q

A bearing with a ‘K’ denotes a tapered bearing. This is held in place by what method?

A

A tapered adapter sleeve

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5
Q

An 8” pulley turns at 120 RPM and drives a second pulley at 150 RPM. What is the driven pulley diameter?

A

6.4” (high over low)

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6
Q

The letters A, B, C on a sprocket refers to what?

A

Hub Class

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7
Q

What is crowning on a pulley used for?

A

Self alignment

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8
Q

The standard taper on an Imperial key is what?

A

1:96

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9
Q

A type of bearing mounted face-to-face and back-to-back is called what?

A

Angular contact

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10
Q

A bearing with a code of SFK 6212 has a bore of ?

A

60mm (last 2#s + 48)

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11
Q

A belt is wrapped around a 6.25” pulley and has 220ﾟ of contact. How much of the belt is contacting the pulley? (Use 3.14159 for pi)

A

11.999” (High over low)

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12
Q

A #60 chain has a pitch of what?

A

3/4”

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13
Q

In a number 65 chain, the 5 refers to what?

A

That the chain is roller-less

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14
Q

A drive system has 2 pulleys. The drive pulley is rotating at 120 RPM, and the driven at 150 rpm. The driven pulley is 6.4” in diameter. What is the diameter of the drive pulley?

A

8” (high over low)

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15
Q

Roller thrust anti friction bearings carry what type of load?

A

Axial

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16
Q

What do you use to check the clearance of a spherical roller bearing?

A

Feeler gauge

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17
Q

What type of coupling connects 2 shafts at slight angles?

A

U-joint

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18
Q

What temperature (in Fahrenheit) is a bearing to be heated to in an oil bath, prior to installation?

A

248 - 250 degrees F°

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19
Q

What temperature ( in Fahrenheit ) is Babbitt poured at?

A

650 - 700 degrees F°
(370°C)

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20
Q

What is the best method of belt joining?

A

Vulcanizing

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21
Q

What is creep in a belt caused by?

A

Elasticity

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22
Q

What is creep in a bearing?

A

The very slow rotation of the outer race

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23
Q

What principle do timing gears use?

A

Gear tooth

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24
Q

A gear tooth with a large pressure angle is said to be what?

A

Stronger

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25
Q

What are gib joints bearing suited for?

A

Limited side loading

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26
Q

High speed bearings and roller chain use what type of lubrication?

A

Mist

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27
Q

How much oil is required to lubricate a ball bearing?

A

Enough to cover halfway up the bottom rolling element

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28
Q

What is the breaker ply of a belt?

A

Layer under the carcass to absorb shock

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29
Q

What do you use to carry fines on a conveyor?

A

Camber slide

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30
Q

In a multi-bearing system, how many bearings are fixed?

A

Only one of them

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31
Q

To change the direction of travel on a conveyor, you would use a what?

A

Bend pulley

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32
Q

The approximate efficiency of a drive chain is what?

A

98%

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33
Q

What is the pitch of a # 80 chain?

A

1”

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34
Q

What is the overall length of a V belt specified in?

A

Pitch diameter

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35
Q

Where should the lubricant entry on a bearing be located?

A

On the low pressure point

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36
Q

What is the housing of a friction bearing called?

A

Pillow block

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37
Q

A Conrad bearing is what type of bearing?

A

ball bearing

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38
Q

A clearance fit means what?

A

Parts fit together easily

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39
Q

Oil grooves in a Babbitt bearing are located where?

A

In the unloaded section

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40
Q

What is a shielded bearing?

A

Is metal covers the rolling elements, sealing in the lubricant

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41
Q

What is a rigid coupling used for?

A

Joining 2 lengths of a shaft

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42
Q

A 60:1 gearbox is driven by a 1750 rpm motor. What is the output speed?

A

29.166 (÷by 60)

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43
Q

What is a Cooper bearing?

A

An anti friction bearing with the components in halves

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44
Q

When is a variable speed drive adjusted?

A

When the drive is running

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45
Q

How are gearboxes lubricated?

A

Splash method

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46
Q

Under what conditions are silent chains used?

A

High speed loads

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47
Q

The part of a belt that transmits power and carries the load is called what?

A

Carcass

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48
Q

A pulley used to increase arc of contact on the drive pulley is called what?

A

Snub pulley

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49
Q

How are turns attained in conveyor systems?

A

Tapered rollers

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50
Q

Friction bearings are what in relation to the shaft?

A

Softer than the shaft

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51
Q

What type of bearing uses the shaft as the inner race?

A

Needle

52
Q

What type of bearing is suitable for high speeds?

A

Ball

53
Q

The taper ratio of a tapered bearing is what?

A

1:12

54
Q

A tapered bearing has what letter at the end of its code?

A

K

55
Q

A bearing in a gearbox, subject to splash lubrication is called what?

A

Open

56
Q

What is the bore of an SKF 6106 bearing?

A

30mm

57
Q

When an anti friction bearing is fitted on a shaft in a fixed position, how is it held in place?

A

Stabilizer rings

58
Q

The best way to remove a bearing from a shaft is to use a set of pullers with the strain applied to wear?

A

The inner race

59
Q

Anti friction failure usually occurs due to what?

A

Contamination

60
Q

When mounting a pair of angular contact bearings, the best technique is what?

A

“O” arrangement (face to face)

61
Q

A short piece of material used to take up the space of the shaft when pouring Babbitt is called what?

A

Mandrel

62
Q

Why must you remove water in a bearing assembly prior to pouring Babbitt?

A

It will cause blow back

63
Q

What prevents a Babbitt bearing from rotating?

A

Dovetail grooves

64
Q

In a Babbitt bearing, the corners of the bottom half must be what?

A

Relieved

65
Q

When precision shells are installed, they will extend past the face of the bearing housing. This is called what?

A

Crush

66
Q

A bearing is selected based on what?

A

Equipment requirements

67
Q

Herring bone gears have what?

A

A formed point at the gear center

68
Q

The distance a worm moves forward when making one complete revolution is called what?

A

Lead

69
Q

The pitch circle of a gear may also be called what?

A

Pitch diameter

70
Q

The gear ratio of a single reduction worm gear is determined by the number of teeth on the gear and what other factor?

A

Number of threads on the worm

71
Q

The portion of tooth above the center line is called what?

A

Addendum

72
Q

Hypoid gears have significant sliding action between meshing teeth. This is counteracted by what?

A

Using EP lubricant

73
Q

A drive gear with 40 teeth turns at 200 RPM. The driving gear has 25 teeth. How many RPM is the driven gear turning at?

A

320 RPM (High over low)

74
Q

A drive gear with 25 teeth turns at 500 RPM. The driving gear has 75 teeth. How fast is the driven gear turning?

A

166.66 RPM (high over low)

75
Q

The term offset or half link alters a chain by what?

A

One pitch

76
Q

What type of shaft alignment is to be checked 1st?

A

Angular

77
Q

A jaw and slider has how many parts?

A

3

78
Q

When using a chain type coupling, the chain is covered by what?

A

Shroud

79
Q

The insert between coupling halves is called what?

A

Spider

80
Q

Dry fluid couplings are preloaded with shot called what?

A

Flow charge

81
Q

The standard size of a V belt is given in letters. The letters refer to what?

A

The sectional area of the belt

82
Q

When multiple belts are connected to form one belt, this is called what?

A

Power bands

83
Q

The pitch line of a timing belt is located on what part of the belt?

A

Neutral line

84
Q

Where is belt tension checked?

A

On the tight side

85
Q

The term given to the amount of power a belt can transmit is related to what?

A

Area of contact

86
Q

A belt drive has a 10.125” and 6.625” pulleys. The center line distance is 12.375”. What is the accurate belt length?

A

51.29”

87
Q

What is the best type of belt material?

A

Polymers

88
Q

What is a notched V belt used for?

A

High speed drives with short centers

89
Q

What is the function of a serpentine belt?

A

Drive on both sides of the belt

90
Q

Rim speed is the ft/min measured on the outside of the pulley. With a 6.25” pulley running at 2450 RPM what is the rim speed?

A

4000 ft/min

91
Q

The ratio of crowning of a roller relative to the face width is what?

A

1:96

92
Q

How do you check for wear on the main bearings in a diesel truck?

A

Plastic gauge

93
Q

If a single inlet fan has too much axle movement, what action is to be taken?

A

Lock the bearing furthest from the fan

94
Q

A motor turns at 1000 RPM. This requires 1.5 horsepower. What is the horsepower at 1500 rpm?

A

2.25 HP

95
Q

What type of engine has the highest compression ratio?

A

Diesel

96
Q

A drive chain is riding at the top of the teeth on a sprocket. This is caused by what?

A

Worn-out sprocket teeth

97
Q

How do you know if a bearing is tight enough on a sleeve?

A

Slight drag on the bearing

98
Q

What type of impeller is best for slurries?

A

Closed Impeller

99
Q

What part of a steam turbine wears out 1st?

A

High pressure areas due to wet steam

100
Q

What type of worm gear gets rid of reverse?

A

Quadruple

101
Q

What type of impeller uses hydraulic balancing?

A

Semi closed

102
Q

How are pistons lubricated?

A

Oil holes

103
Q

In a bearing, what happens if you use soft grease?

A

Higher temperature

104
Q

What would cause a belt to turn over in a sheave?

A

Missalignment

105
Q

What causes a V belt to obtain shiny sides immediately following installation?

A

Wrong Sheave

106
Q

What causes drifting on a conveyor?

A

Misaligned idlers

107
Q

What is the best set screw arrangement for maximum holding power?

A

12 and 9

108
Q

What causes an amp drop on the motor of a vacuum system?

A

Blocked Inlet

109
Q

What is the term given for a motor that runs at a speed where vibration occurs?

A

Critical speed

110
Q

What is the function of a jacking pump in a steam turbine?

A

Allow oil to circulate prior to rotation

111
Q

If you have a shaft with the diameter of 3.125” and is tapered down to 1.250” over a length of 7.525” what is the taper per foot?

A

2.99”

112
Q

A belt drive has pulleys of 9.6875” and 6.255”. The center distance is 28.375”. What is accurate belt length?

A

81.88”

113
Q

An anti-friction bearing is to be heated in an oil bath at 250ﾟ. The inside diameter of the bearing is 3.5”. What is the bore size after the heating? ( Room temperature is 70ﾟ)

A

3.501134”

114
Q

What prevents a bearing from seating on a shaft against the shoulder?

A

Burrs on the shoulder

115
Q

What best describes how hypoid gears operate?

A

Operate at non-parallel, non-intersecting axes

116
Q

What would cause a chain to ride on top of a sprocket?

A

Chain stretched

117
Q

How does a labyrinth seal work?

A

Non contact seal that permits liquid to be forced through centrifugal force to the outside of its grooves

118
Q

Tapered roller bearings permit what types of loads?

A

Permit axial and radial loads

119
Q

How is a belt adjusted that is running out to one side?

A

square up head and tail pulleys

120
Q

How are hydraulic jacks stored?

A

Fully retracted in the vertical position

121
Q

What is the primary purpose of a Woodruff key?

A

Avoid having a machine too much metal away from stressed areas of shaft

122
Q

How many teeth on a driven spur gear will create a 2:1ratio when the drive gear has 90 teeth, and the idler has 10 teeth?

A

45 tooth

123
Q

What type of maintenance is an oil change?

A

Preventative

124
Q

What percent of a chain is left slack on a chain drive set up?

A

4%

125
Q

What causes a heat exchanger to leak internally?

A

Gasket ripped

126
Q

Bearing wear on start-up is caused by what?

A

Lack of oil wedge

Millwright (11 decks)

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