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Test Review > Belt, Chain, Gear Test > Flashcards

Belt, Chain, Gear Test Flashcards

1
Q

What length of belt is required if the c to c distance is 51”, small pulley is 10” big pulley is 30”?

A

Formula:

((D+d) /2) x pi(3.1416) + 2 x c

13’9”

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2
Q

A variable speed drive changes belt position from the top of the driver sheave to the bottom. This results in a speed_________

A

Decrease

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3
Q

A v-belt code marked 5v 250 means?

A

5/8” wide 25” long

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4
Q

The term used to describe the tension needed on a belt to transmit power without slippage is?

A

Effective tension

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5
Q

V belt drives achieve a tighter belt grip than flat belts do to the?

A

Wedging action

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6
Q

Positive drive belts (similar to chain drives) must be used with?

A

Pulleys of the same pitch

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7
Q

Polly V belts are constructed by adding a cover backing to the top of two or more standard belts with a backing.

True or false

A

False : banded belts are built by adding backing to two or more standard belts

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8
Q

The standard crown put into a flat pulley is?

A

1/8” per foot

Or

1/96

Same thing

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9
Q

The width of a pulley for a flat belt of a 7” width would be _______.

A

1 inch extra on each side.

=

9”

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10
Q

A sheave that has both A and B section grooves on it is known as a ________

A

Combination sheave

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11
Q

Variable speed sheaves are adjusted while the Machine is ________?

A

Running

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12
Q

Belt storage for synthetic belts should be in a _________ and _______ place?

A

Cool and humid

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13
Q

If the V belt inside diameter is cracked, the most likely cause is?

A

Pulley diameter to small

Or

Burning caused by slippage

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14
Q

If an idler is needed to increase the arc contact on the drive pulley, you need to put the idler where?

A

Outside near the driver

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15
Q

Linked v belts are used when?

A

Emergency

On sheaves mounted inside bearings

Depending on manufacture can be same power rating

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16
Q

Chirping in belts is caused by?

A

Dust

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17
Q

The pitch line of a v belt is at the?

A

Pitch line

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18
Q

If an idler is placed on the inside of a v belt to tension it, the idler would:

A

Decrease the arc of contact

Be a grooved or a flat pulley

Be put on the slack side at a point that produces equal arc of contact on the sheaves

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19
Q

What could happen when you use anti seize on the tapered bushing and a CAST sheave when mounting on a shaft?

A

Break the pulley

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20
Q

Why should you NOT depend on feel when tensioning a belt?

A

Everyone has a different feel for tension

Tensile members have a different strengths and require different tensions

Different belt manufactures have different standards

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21
Q

The amount of power that a v belt can transmit depends on the arc of contact, tension applied and coefficient of friction.

True or false

A

True

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22
Q

Slip is when creep of the belt increases to extend all the way around the pulley because of an increase in load.

True or false

A

True

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23
Q

Cogged raw edge belts:

A

Designated by an x at the end

Have good flexibility

Have high coefficient of friction

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24
Q

Banded belts help stop belt turn over.

True or false

A

True

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25
Q

Open ended v belts have a carrying capacity of _______ that of an endless v belt.

A

1/3 the capacity

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26
Q

If a new v belt runs down the groove of the sheave it is time to?

A

Replace the sheave

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27
Q

If a v belt has a cut bottom and side wall this indicates the belt was __________?

A

Pried onto the sheave

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28
Q

If a v belt is found to be swollen in size, this is an indication of the belt exposed to _________?

A

Oil

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29
Q

If you find a banded belt having cuts thru the backing and running in the bottom of the sheave grooves, you should?

A

Replace sheaves and belts

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30
Q

When using a straight edge to check sheave alignment, you should make sure the maximum misalignment does not exceed __________ per foot of belt span

A

1/16”

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31
Q

You are checking for _________ when you have a dial indicator reading off of one of the sheave groove faces.

A

Sheave runout

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32
Q

When using a deflection gauge to check for proper belt tension, you need to set the force applied o-ring and the other o- ring to the proper deflection distance for that belt.

True or false

A

True

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33
Q

Before checking the belt for proper tension, you should always rotate the belt and sheaves a few turns.

True or false

A

True

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34
Q

Quarter turn belts :

A maximum speed ration of 2.5:1

A centre distance of 5.5 times the sum of the large sheave diameter plus its face width

It’s centre line of the horizontal shaft above the centre line of the vertical shaft

All of the above

A

All of the above

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35
Q

If a belt is snaking from one sheave to the other while running it indicates?

Sheave runout

Sheave misalignment

Shaft runout

All of the above

A

All of the above

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36
Q

Standard belts are designed to run at a maximum temp of ______ degrees C

A

60

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37
Q

Synchronous belts are timing belts.

True or false

A

True

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38
Q

Synchronous belts are about 98% efficient and need less tension then the standard v belts.

True or false

A

True

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39
Q

Synchronous belts need _____ degrees of arc contact on the sprocket and ______ teeth engaged

A

60 degree arc contact

6 teeth engaged

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40
Q

If you are using plastic sheaves you are in a ?

A

Light duty environment

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41
Q

Chain sprockets are described by letters A B C D. These letters refer to the hub ______

A

Class

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42
Q

The minimum amount a roller chain can be shortened is _____ pitch?

A

1

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43
Q

A modified leaf chain that forms a tooth pattern when assembled is a _______?

A

Silent chain

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44
Q

A type d sprocket means what?

A

Split hub

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45
Q

A chain designated #120-2 has a pitch of _______?

A

1 1/2”

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46
Q

The recommended lubrication system for drives of moderate speed and load are_______?

A

Oil bath

47
Q

When ever possible, install horizontal chain so that it runs with which strand tight? Top or bottom

A

Top strand tight

48
Q

Idler sprockets should ________?

A

Increase the tension in the slack side of the chain

49
Q

A type B should be mounted with the hub less face next to the ______?

A

Bearing

50
Q

What is the installed sag in the bottom strand for a 125” centre to centre distance and running at high speed?

Sag in “ = c to c distance x % of sag allowed

A

2.5” to 3.75”

51
Q

A chain drive with misalignment would have noticeable wear on the chain ______?

A

Side plates (insides)

52
Q

A #2080 chain is a

A

Double strand chain with a 2” pitch

53
Q

A drive has a sprocket with 24 teeth and a driven sprocket with 32 teeth. The c to c is 33” . What is the approximate length of chain needed for the drive, if the chain size is 100 roller chain?

C to C x 2

Count half teeth on each sprocket. Add together and multiply by chain pitch

Add c to distance and sprocket wrap

A

33 x 2 = 66

24/2= 12 
32/2= 16

12+16 x 1.25 (100p) = 35

66 + 35 = 101”

54
Q

A double pitch chain with a regular pitch sprocket (single pitch), how would you get even wear on all teeth?

A

Use 2 odd numbered tooth sprockets

55
Q

Sintered bushing chain has what characteristic?

A

Last 5 times longer than standard chain

56
Q

Rollerless chain has a designation of _____ when chain is above a 1/2” pitch?

A

5

57
Q

When selecting a chain you should consider which of the following?

Horse power

Driver and driven shaft speeds

Operating environment

All of the above

A

All of the above

58
Q

When ordering a sprocket you need to know:

A

Class of hub and size of chain

The pitch and number of teeth

Of teeth need to be hardened

59
Q

Weakest link in a roller chain is the ______?

A

1 pitch offset link

60
Q

Multiple strand chain is used when ______ and _______ for single chain?

A

Speed is to high

Or

Load is to great

61
Q

O-ring chain keeps out contaminants, sealed for life and last about 10 times that of standard chain.

True or false

A

True

62
Q

Silent chain is used in high horse power applications and where there is limited space for the drive.

True or false

A

True

63
Q

Alignment of chain drive shafts and sprockets must be corrected in the horizontal and vertical planes which include offset and angular misalignment

True or false

A

True

64
Q

The split in a master link spring clip should face against the direction of travel.

True or false

A

True

65
Q

Forced lubrication is used on heavily loaded drives operating above the speed limits of the bath lubrication system.

True or false

A

True

66
Q

If the teeth on a sprocket are hooked or thinned down and / or the chain has been exposed to excessive loading, you must:

Change the sprocket

Change the chain

Check for misalignment

All of the above

A

All of the above

67
Q

A chain drive should have 120 degrees of contact with the small sprocket or a speed ratio of 3:1

True or false

A

True

68
Q

A double single sprocket is designed to be used with a 2 strand chain.

True or false

A

False

A double single sprocket is used for 2 single chains moving separate parts

69
Q

Keyless bushings are used in places where good balance is needed of the drive sprocket and also where there is no keyway.

True or false

A

True

70
Q

When installing a cylindrical bore sprocket hub, you need to keep the dial readings to _______ for runout?

A

.002” or less

71
Q

Broken roller chains or sprockets are a sign of ______ or _______

A

Shock or overloading.

72
Q

A stiff chain is a sign of:

A

Faulty lubrication

Rust or corrosion

Misalignment

73
Q

Ideally join the roller chain on the sprocket.

True or false

A

True

74
Q

If you pull the chain on the backside of the sprocket and it pulls away from the sprocket, this is a sign of?

A

Worn pins and bushings

75
Q

Align parallel shafts In a chain drive with a feeler bar.

True or false

A

True

76
Q

Silent chain needs to be held on sprockets with guide plates or a flanged sprocket.

True or false

A

True

77
Q

On roller chain, the roller diameter is approximately 5/8 of the pitch.

True or false

A

True

78
Q

Speed ratio can be:

high speed shaft rpm/low speed shaft rpm

Or

Number of teeth on driven sprocket. /
Number of teeth on drive sprocket

True or false

A

True

79
Q

A gear system that is exposed to overhung loads are?

A

Gears with bearings on only one side

80
Q

A floating gear or shaft is?

A

On that floats axially to find it’s centre

81
Q

Bevel gears are cut out of blanks like cones and ________?

A

Used on intersecting shafts

82
Q

Hypoid gears are used in shafts crossing over, can be straddle mounted and need _____ lube?

A

E.P

83
Q

Worm and wheels that are double throated have more _____________ with each other ( more depth)

A

Engagement

84
Q

When setting up a worm and wheel reducer for contact between the worm and wheel, it should be slightly off centre toward the _________ side of the worm wheel?

A

Leaving

85
Q

Planetary gears have the four main parts:

Sun

Carrier

Ring

And _________ gears

A

Planet

86
Q

What cannot be held in a planetary gear system?

A

The planets

87
Q

If you see pitting on the gears of a drive unit, this is an indication of:

Wrong lubricants

Heavy loads and low speeds

And __________ lubes

A

Contaminated

88
Q

In gear reducer, lubrication is diverted to all areas needing lubrication by :

Scrappers

Dams

And _________?

A

Baffles

89
Q

When using lead wire to check backlash, you should measure the wire on both sides of the tooth at the _______ line

A

Pitch

90
Q

SM cycloid reducers must have the sheave mounted where?

A

As close to the bearing as possible

91
Q

Backstops on conveyors are used to?

A

Stop reverse motion of the conveyor

92
Q

When installing a idler between the 2 gears, you know that the final gear will turn the same direction as the first gear and the idler will not _________ the speed ratio of the gear system.

A

Change

93
Q

When adjusting the correct preload of the worm and wheel tapered roller bearings you ________ shims between the bearing caps and reduction unit housing to increase the preload

A

Take out

94
Q

All gear tooth profiles are involute form.

True or false

A

False

Can be involute or straight

95
Q

The addendum is a greater length length than the dedendum.

True or false

A

False

Dedendum included clearance

96
Q

Correct meshed gears always have pitch circles that coincide at the pitch point.

True or false

A

True

97
Q

The shaft centre distance between a pair of meshing gears is the sum of their individual pitch circle diameters

True or false

A

False

98
Q

When the revolutions of the driven gear increase, the Torque of that gear increases.

True or false

A

False speed increases

99
Q

Rack and pinion gears have one gear with a straight pitch line while the other has a circular pitch line

True

False

A

True

100
Q

Bevel gears develop both axial and radial thrust loads and need bearings that can accommodate both types of load.

True or false

A

True

101
Q

2 meshing single helical gears of the same hand will only connect shafts that are parallel

True or false

A

False must be of opposite hand

Shafts crossing over at 90 must be same hand

102
Q

When shaft mounted drives provide only part of the total reduction needed, the remainder will be reduced by ____________

A

V belts and sheaves

103
Q

What is the primary type of lubrication system used in worm and wheel reducers?

A

Splash

104
Q

What shaft conditions prevent shaft mounted reducers from being properly installed:

Out of round

Misaligned

And _______

A

Bent

105
Q

The space between the gear sets mating teeth and the root is called the ________

A

Clearance

106
Q

Double helical gears do not have what feature that the herringbone gear teeth have ?

A

A formed tooth at the tooth profile centre

107
Q

Which gear type reduces the thrust?

A

Double helical

108
Q

The outside diameter of a gear is equal to the root circle diameter plus _____ addendums

A

2

109
Q

An 8 DP refers to a gear that has _______

A

8 teeth per inch of the gears pitch circle diameter

110
Q

Backlash can be checked within a helical gear box by using the lead wire procedure which is?

A

Run lead wire between the mating teeth

Recover the wire and measure the thickness at the deformed regions at the pitch line

111
Q

To ensure correct mesh pattern between worm and wheel reduction you must :

Assemble and install worm shaft and bearings with proper shim pac to get correct pre load

Add light coat of pursion blue to WORM

Mount worm wheel and bearings. Use proper shim pack for bearing clearance

Rotate worm in proper direction wile applying resistance to the worm wheel

Check contact pattern and adjust with shims moving from side to side until contact pattern slightly toward leaving side of worm wheel

True or false

A

True

112
Q

Is a stainless steel chain in wet and corrosive areas.

True or false

A

True

113
Q

Adding a jack shaft to a system will help:

Increase the arc contact on the small sprocket

Reduce the overall ratio of the original drive by dividing it up

And _________

A

Decrease chain and sprocket wear

114
Q

A slip fit master link decreases the strength by ______%

A

30

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