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millwright level 2 test questions from teacher > Belts, Chain, Gears test teacher > Flashcards

Belts, Chain, Gears test teacher Flashcards

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1
Q

what length of belt is required if the centre to centre distance is 51” and the small pulley is 10” and big pulley is 30 “ formula –( (D+d)/2 ) x pi + 2xc pi=3.1416 c=centre to centre distance

19’ 6”

17’ 8”

20’ 4”

13’ 9”

A

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 increase

speed decrease

no speed change

reverse of direction

A

speed decrease

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3
Q

.a v-belt code marked 5V 250 on the outside means

5/8” wide by 25” long

5/8” wide by 250” long

3/8” wide by 25 “ long

3/8” wide by 250” long

Option 5

A

5/8” wide by 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

effective tension

installed tension

equal tension

free tension

A

effective tension

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5
Q

v-belt drives achieve a tighter belt grip than flat belts due to the

area of contact

wedging action

efficiency of friction

arc of contact

A

weddgng action

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6
Q

positive drive belts (similar to chain drives) and must be used with

low loads and speeds

pulleys of the same pitch

small pulleys

all the above

A

pulls of the same pitch

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7
Q

polly v-belts are constructed by adding a cover backing to the top of 2 or more conventional belts

true

False

A

false

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8
Q

the standard crowm built into the a flat pulley is

1/8”/ft

1/16”/ft

1/3 of the belt width

1/96

both the first and 4th answers are correct

A

both the first and 4th answers are correct

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9
Q

the width of a pulley for a flat belt of a 7” width would be

8”

9”

10”

7”

A

9”

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10
Q

chirping is caused by

dust

over-tightened belts

idler pulleys

cocky students

A

dust

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10
Q

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

variable sheave

adjustable sheave

combination sheave

none of the above

A

combination sheave

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11
Q

belt storage for synthetic belts should be in a

cool and dry place

cool and humid place

damp and dark place

it does not matter

A

cool and humid place

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11
Q

variable speed sheaves are adjusted

slowly while stopped

while running

at rest

stopped and locked out

A

while running

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11
Q

linked v-belts are

used in an emergancy

used on sheaves that are mounted inside bearings

available in the smae power rating as standard belts by some manufacturers

all the above

A

all the above

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11
Q

if an idler is needed to increase the arc of contact on the drive pulley, you need to put the idler

inside near the driver

inside near the driven

outside near the driver

outside near the driven

A

outside near the driver

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12
Q

if the v-belt inside diameter is cracked, the most likely cause/s is

misalignment

the pulley diameter is to small

burning caused by excessive slip

both the 2nd and 3rd answers are correct

A

both the 2nd and 3rd answers are correct

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13
Q

the pitch line of a v-belt is at the

insulation area

tensile member

cushion layer

cover

A

tensile member

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14
Q

if an idler is added to the inside of a v-belt to tension it, the idler would

decrease the arc of contact

be a grooved or flat pulley

be put on the slack side at a point that produces equal arcs of contact on the sheaves

all the above

A

all the above

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15
Q

what could happen if you use never seize on the tapered surfaces of a tapered bushing and a cast sheave being mounted on a shaft

seize on the shaft

cause less friction on the shaft

break the pulley

nothing, this is what you are suppost to do

A

break the pully

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16
Q

why should you not depend on feel when checking the tension of the belt

everyone has a different feel for tension

tensile members of different strengths require different tensions

different belt manufactureres have differne standards

all the above

A

all the above

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17
Q

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

true

false

A

true

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18
Q

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

true

false

A

true

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19
Q

cogged raw edged belts

are designated by an x at the end

have good flexibility

have a high coefficient of friction

all the above

A

all th above

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20
Q

banded belts help stop belt turn-over

true

false

A

true

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21
Q

open-ended v-belts have a carrying capacity of__________ of that of an endless v-belt

1/4

1/3

3/4

there is no marked difference

A

1/3

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22
Q

if a new v-belt runs down in the groove, it is time to

change the hub

change the sheave

both the first and 2nd answers are correct

none of the above

A

change the sheave

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23
Q

if a v-belt has a cut bottom and side-wall, this indicates that the

belt was pried onto the sheave during installation

belt was oil-soaked

belt had a back-side idler

sheave was to large

A

belt was pried onto the sheave during installation

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24
Q

if a v-belt is found to have swollen in size, this is an indication of

belt exposed to water

belt exposed to oil

belt running in hot conditions

All the above

A

belt exposed to oil

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25
Q

when using a straight edge to check for sheave alignment, you should make sure the maximum misalignment does not exceed

1/16” per 6” of belt span

1/16” per foot of belt span

1/4” per 6” of belt span

1/4” per foot of belt span

A

1/16” per foot of belt span

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26
Q

if you find a banded belt having cuts thru the backing and the running in the bottom of the seave grooves, you should

add more backing

loosen off the tension

replace the sheaves and belt

check for proper belt material

A

replace the sheaves and belt

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27
Q

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

sheave rim runout

sheave damage

sheave runout

proper alignment of the sheave to the other sheave

A

sheave run out

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28
Q

when using a deflection gauge to check for proper telt tension, you need to set the force applied o-ring to 0 and the other o-ring to the proper deflection distance for that belt

true

false

A

true

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29
Q

quarter turn belts

a maximum speed ratio of 2.5 to 1

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

its centre line of the horizontal shaft abov the centre line of the vertical shaft

all the above

A

all the above

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29
Q

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

true

false

A

true

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30
Q

synchronous belts are timing belts

true

False

A

true

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30
Q

synchronous belts need _______ degrees of arc contact on the sprocket and _____ teeth engaged

120, 6

60, 8

60, 6

100, 8

A

60,6

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30
Q

if a belt is snaking from one sheave to the other while running indicates

sheave runout

sheave misalignment

shaft runout

all the above

A

all the above

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31
Q

standard belts are designed to run at a maximum of ____degrees Celsius

50

60

80

100

A

60

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32
Q

synchronous belts are about 98% efficient and need less tension then the standard v-belts

true

false

A

true

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33
Q

if you are using plastic sheaves, you are in a/an

highly abrasive environment

light duty installation

a high temperature environment

all the above

A

light duty installation

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34
Q

chain sprockets are describe by letters A,B,C,D. these refer to the hub_________

bore

class

size

diameter

A

class

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35
Q

the minimum amount a roller chain can be shortened is

1 link

1 pitch

1/2 pitch

2 links

A

1 pitch

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36
Q

a modified leaf chain that forms a tooth pattern when assembled is a

wrench chain

silent chain

vise chain

oil field chain

A

silent chain

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37
Q

a type D sprocket is of a___________ design

steel plate

split hub

hub 1 side

hub both sides

A

split hub

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38
Q

a chain designated #120-2 has a pitch of

3/4”

1 1/4”

1”

1 1/2”

A

1,1/2

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39
Q

the recommended lubrication system for drives of moderate speed and load is

manual

bath

pump with a stream flow

drip

A

bath

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40
Q

when ever possible, install horizontal chain so that it runs with the

top strand tight

bottom strand tight

top and bottom strand loose

idler loose

A

top strand tight

41
Q

idler sprockets should

always be placed inisde the chain

have at least 3 teeth engaged

have at least 5 teeth engaged

increase the tension on the slack side of the chain

A

increase the tension on the slack side of the chain

42
Q

a type B hub should be mounted with

the hub next to the bearing

hubless face next to the bearing

a clearnace of 0.008” from the end of the shaft

none of the above

A

hubless face next to the bearing

43
Q

what is the installed sag in the bottom strand for a 125” centre to centre distance and running at a high speed sag(in inches)= c to c distance x % of sag allowed

1” to 2”

1.5” to 2”

2.5” to 3.75”

4” to 5.75”

A

2.5” to 3.75”

44
Q

a # 2080 chain is a

double pitch chain with a 2” pitch

double strand chain with a 2” pitch

a double strand chain with a 1” pitch

a double pitch chain with a 1” pitch

A

double pitch chain with a 2” pitch

45
Q

a chain drive with misalgnment would have noticable wear on the chain

side plates (inside)

pins

rollers

side plates (outside)

A

side plates (inside)

46
Q

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

99”

101”

103”

89”

A

101

47
Q

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

use 2 even numbered tooth sprockets

use 1 even and 1 odd numbered tooth sprockets

use 2 odd numbered tooth sprockets

all of the above

A

use 2 odd numbered tooth sprockets

48
Q

sintered bushing chain has what follwoing characteristics

has 0-rings

10 % stronger than standard chain

lasts 5 times longer than standard chain

A

lasts 5 times longer than standard chain

48
Q

rollerless chain has a designation of ___ when chain is below a 1/2” pitch

1

5

0

25

A

5

49
Q

when selecting a chain, you should find which of the following

horse power

driver and driven shaft speeds

operating environment

all the above

A

all the above

50
Q

when ordering a sprocket, you need to know

the class of hub and size of chain

the pitch and number of teeth

if the teeth need to be hardened

all the above

A

all the above

51
Q

the weakest link in roller chain is the

2 pitch offset link

1 pitch offset link

the press fit master link

all are equally weak

A

1 pitch offset link

52
Q

multiple strand chain is used when ________ for a single chain

the speed is to high

the load is to great

the load is minimal

both the 1st and 2nd answers are correct

A

both the 1st and 2nd answers are correct

53
Q

0-ring chain keeps out contaminants, sealed for life and lasts about 10 times that of standard chain

true

false

A

true

54
Q

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

true

false

A

true

55
Q

the split on the master link spring clip should face the direction of travel

true

false

A

false

55
Q

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

true

false

A

true

56
Q

when lubricating roller chain, you must oil the chain with high grade petroleum oil with proper additives and add the oil between the side plates on the inside of the chain

true

false

A

false

57
Q

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

true

false

A

true

58
Q

if the teeth on a sprocket are hooked or thinned down (face and / or depth) and / or the chain has been exposed to excessive loading, you must

change the sprocket

change the chain

check for misalignment

all the above

A

all the above

58
Q

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

true

False

A

true

59
Q

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

true

false

A

fasle

60
Q

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

true

false

A

true

61
Q

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

0.010”

0.005”

0.002” or less

0.000”

A

0.002” or less

62
Q

broken roller chains or sprockets are a sign of shock or overload

true

false

A

true

63
Q

a stiff chain is a sign of

faulty lubrication

rust or corrosion

misalignment

all the above

A

all the above

63
Q

ideally, join the roller chain on the sprocket teeth

true

False

A

true

64
Q

if you pull on the chain on the back side of the sprocket and it pulls away from the sprocket, this is a sign of

worn side plates

worn locking devices

worn pins and bushings

wrong pitch

A

worn pins and bushings

65
Q

align parallel shafts in a chain drive with a feeler bar

true

false

A

true

66
Q

silent chain needs to be held on the sprockets with guide plates or a flanged sprocket

true

false

A

true

67
Q

on roller chain, the roller diameter is approximately 5/16 of the pitch of the chain

true

false

A

fALSE

68
Q

speed ratio can be high speed shaft rpm/low speed shaft rpm or # of teeth on driven sprocket/#of teeth on the drive sprocket. ( / = divide )

true

false

A

true

69
Q

a gear system that is exposed to over hung loads are

gears with bearings on both sides

gears with bearings on only one side

gears on parallel shafts

double helical gears

A

gears with bearings on only one side

70
Q

a floating gear or shaft is

one that floats axially to find its centre

one that floats radially to find its centre

one that has prelaod in the bearings that support it

either a worm or wheel gear

A

one that floats axially to find its centre

71
Q

bevel gears are

used on intersecting shafts

cut out of blanks shaped like cones

used at 90 degree angles only

both the first and 2nd answers are correct

A

used on intersecting shafts

cut out of blanks shaped like cones

72
Q

hypoid gears

are used in shafts crossing over

can be straddle mounted

need extreme pressure lubes

all the above

A

all the above

73
Q

when setting up a worm and wheel reducer for contact between the worm amd wheel, it should be

acrossl the face or the entire tooth

slightly off centre toward the leaving side of the worm whee;

contacting the top of the teeth only

contacting the bottom of the teeth only

A

slightly off centre toward the leaving side of the worm whee;

73
Q

worms and wheels that are double throated

have more contact because of the prelaod in the bearings

have adjustments for backlash

have more engagement with each other (more depth)

have less power transfer in the reducer than non-throated

A

have more engagement with each other (more depth)

73
Q

.planetary gears have the following 4 main parts

sun, carrier, ring and bearings

sun, carrier, ring and planet gears

sun, carrier, moon , planet gears

sun, carrier, ring and bushings

A

sun, carrier, ring and planet gears

74
Q

with planetary gear systems, which cannot be held

the ring

the sun

the carrier

the planets

A

the planets

75
Q

if you see pitting on the gears of a drive unit, this would be caused by

wrong lubricant

heavy loads and low speeds

contaminated lubes

all the above

A

all of the above

75
Q

in a gear reducer, lubrication is diverted to all areas needing lubrication by

scrappers

dams

baffles

all the above

A

all the above

76
Q

when using lead wire to check backlash, you should measure the wire on

one side of the tooth and double it

both sides of the tooth at the outside diameter

both sides of the tooth at the pitch line

the back side and the top

A

both sides of the tooth at the pitch line

77
Q

all gear tooth profiles are of the involute form

true

false

A

false

77
Q

SM cycloid reducers must have

shims put between the housing haves to set the backlash

extreme pressure lubes

the sheave mounted as close to the bearing as possible

blueing to check gear contact

A

the sheave mounted as close to the bearing as possible

78
Q

when installing an idler between the 2 gears, you know that

the final gear will turn in the same direction as the first gear

the final gear will turn in the opposite direction as the first gear

the idler will not change speed ratio of the gear system

both the 1st and 3rd answers are correct

A

both the 1st and 3rd answers are correct

78
Q

backstops on inclined conveyors are used to

set up the sheave alignment

stop reverse rotation of the conveyor

protect the drive from damage

all the above

A

stop reverse rotation of the conveyor

79
Q

when adjusting for correct preload of the worm and wheel tapered roller bearings

add shims between the bearing caps and reduction unit housing to increase the preload

take out shims between the bearing caps and reduction unit housing to decrease the prelaod

take out shims between the bearing caps and reduction unit housing to increase the preload

add shims between the bearing caps and reduction unit housing to take out axial float

A

take out shims between the bearing caps and reduction unit housing to increase the preload

80
Q

the addendum is a greater length than the dedendum

true

false

A

false

81
Q

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

true

False

A

false

82
Q

when the revolutions of the driven gear increase, the torque of that gear increases

true

False

A

false

82
Q

correct meshed gears always have pitch circles that coincide at the pitch point

true

False

A

true

82
Q

when shaft mounted drives provide only part of the total reduction needed, the remainder will be furnished by a

geared coupling

mitre gear box

second reducer

set of v-belts and sheaves

A

set of v-belts and sheaves

83
Q

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

forced feed

circulating pump

splash

dry sump

A

splash

84
Q

rack and pinion gears have one gear with a striaght pitch line while the other has a circular pitch line

true

false

A

true

85
Q

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

true

false

A

false

85
Q

which of the following shaft conditions will prevent a shaft mounted reducer from being properly installed

out of round

misaligned

bent

all the above

A

all the above

86
Q

bevel gears develop both axial and radial thrust loads and need bearings that can accomadate both types of loads

true

False

A

true

87
Q

the space between the gear sets mating teeth at the root is called the

backlash

working depth

clearance

pressure angle

A

clearance

88
Q

double helical gears do not have what feature that herringbone gear teeth have

slight interference between gears

a helix angle close to 20 degrees

a formed point at the tooth profile centre

less clearance in the teeth

A

a formed point at the tooth profile centre

89
Q

which of the following gear type reduces the thrust

simple helical

miter

double helical

spiral bevel

A

double helical

90
Q

the outside diameter of a gear is equal to

the root circle diameter plus 2 dedendums

the pitch circle diameter plus 2 dedendums

th pitch circle diameter plus 2 addendums

the root circle diameter plus 2 working depths

A

th pitch circle diameter plus 2 addendums

91
Q

to ensure correct mesh pattern between a worm and wheel reduction unit, you must
1-assemble and install worm shaft and bearings with proper shim pack to get correct preload
2- add light coat of prussion blue to worm
3-mount worm wheel and bearings, use proper shim pack for bearing clearances
4-rotate worm in proper direction with applying resistance to the worm wheel
5-check contact pattern and adjust with shims moved from one side to the other to get a contact pattern slightly toward the leaving side of the worm wheel

true

false

A

true

92
Q

an 8 DP refers to a gear that has

8 teeth per inch of the gears outside diameter

8 teeth per inch of the gears root circle diameter

8 teeth per inch of the pitch circle circumference

8 teeth per inch of the gears pitch circle diameter

A

8 teeth per inch of the gears pitch circle diameter

93
Q

backlash can be checked within a helical gearbox by using the lead wire procedure which is

place the lead wire into the gears and bolt down cover to squeeze the lead wire

run lead wire between the mating teeth, then recover the wire and measure the thickness at the deformed regions at the pitch line

place the lead wire at the root of one gear and turn gears until a mating tooth deforms the wire than measure wire at deformed section

stretch the lead wire till it can fit between mating teeth. than measure wire thickness

A

run lead wire between the mating teeth, then recover the wire and measure the thickness at the deformed regions at the pitch line

94
Q

use a stainless steel chain for wet and corrosive conditions

true

false

A

true

95
Q

adding a jackshaft to a drive system will help

increase the arc of contact on the small sprocket

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

decrease chain and sprocket wear

all the above

A

all the above

96
Q

a slip fit master link decreases the strength of the chain by ____%

10

20

30

40

A

30

millwright level 2 test questions from teacher (6 decks)

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