Belts, Chain, Gears test teacher Flashcards by kk kk

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”

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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

speed decrease

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.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

5/8” wide by 25” long

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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

effective tension

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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

weddgng action

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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

pulls of the same pitch

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

true

False

false

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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

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

8”

9”

10”

7”

9”

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chirping is caused by

dust

over-tightened belts

idler pulleys

cocky students

dust

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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

combination sheave

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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

cool and humid place

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variable speed sheaves are adjusted

slowly while stopped

while running

at rest

stopped and locked out

while running

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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

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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

outside near the driver

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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

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the pitch line of a v-belt is at the

insulation area

tensile member

cushion layer

cover

tensile member

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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

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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

break the pully

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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

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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

true

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

true

false

true

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cogged raw edged belts

are designated by an x at the end

have good flexibility

have a high coefficient of friction

all the above

all th above

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banded belts help stop belt turn-over

true

false

true

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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

1/3

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

change the sheave

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

belt was pried onto the sheave during installation

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

belt exposed to oil

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

1/16" per foot of belt span

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

replace the sheaves and belt

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

sheave run out

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

true

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

all the above

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

true

synchronous belts are timing belts true False

true

synchronous belts need _______ degrees of arc contact on the sprocket and _____ teeth engaged 120, 6 60, 8 60, 6 100, 8

60,6

if a belt is snaking from one sheave to the other while running indicates sheave runout sheave misalignment shaft runout all the above

all the above

standard belts are designed to run at a maximum of ____degrees Celsius 50 60 80 100

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

true

if you are using plastic sheaves, you are in a/an highly abrasive environment light duty installation a high temperature environment all the above

light duty installation

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

class

the minimum amount a roller chain can be shortened is 1 link 1 pitch 1/2 pitch 2 links

1 pitch

a modified leaf chain that forms a tooth pattern when assembled is a wrench chain silent chain vise chain oil field chain

silent chain

a type D sprocket is of a___________ design steel plate split hub hub 1 side hub both sides

split hub

a chain designated #120-2 has a pitch of 3/4" 1 1/4" 1" 1 1/2"

1,1/2

the recommended lubrication system for drives of moderate speed and load is manual bath pump with a stream flow drip

bath

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

top strand tight

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

increase the tension on the slack side of the chain

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

hubless face next to the bearing

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"

2.5" to 3.75"

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

double pitch chain with a 2" pitch

a chain drive with misalgnment would have noticable wear on the chain side plates (inside) pins rollers side plates (outside)

side plates (inside)

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"

101

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

use 2 odd numbered tooth sprockets

sintered bushing chain has what follwoing characteristics has 0-rings 10 % stronger than standard chain lasts 5 times longer than standard chain

lasts 5 times longer than standard chain

rollerless chain has a designation of ___ when chain is below a 1/2" pitch 1 5 0 25

when selecting a chain, you should find which of the following horse power driver and driven shaft speeds operating environment all the above

all the above

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

all the above

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

1 pitch offset link

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

both the 1st and 2nd answers are correct

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

true

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

true

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

false

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

true

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

false

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

true

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

all the above

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

true

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

fasle

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

true

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"

0.002" or less

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

true

a stiff chain is a sign of faulty lubrication rust or corrosion misalignment all the above

all the above

ideally, join the roller chain on the sprocket teeth true False

true

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

worn pins and bushings

align parallel shafts in a chain drive with a feeler bar true false

true

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

true

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

fALSE

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

true

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

gears with bearings on only one side

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

one that floats axially to find its centre

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

used on intersecting shafts cut out of blanks shaped like cones

hypoid gears are used in shafts crossing over can be straddle mounted need extreme pressure lubes all the above

all the above

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

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

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

have more engagement with each other (more depth)

.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

sun, carrier, ring and planet gears

with planetary gear systems, which cannot be held the ring the sun the carrier the planets

the planets

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

all of the above

in a gear reducer, lubrication is diverted to all areas needing lubrication by scrappers dams baffles all the above

all the above

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

both sides of the tooth at the pitch line

all gear tooth profiles are of the involute form true false

false

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

the sheave mounted as close to the bearing as possible

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

both the 1st and 3rd answers are correct

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

stop reverse rotation of the conveyor

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

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

the addendum is a greater length than the dedendum true false

false

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

false

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

false

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

true

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

set of v-belts and sheaves

what is the primary type of lubrication system used in worm and wheel reducers forced feed circulating pump splash dry sump

splash

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

true

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

false

which of the following shaft conditions will prevent a shaft mounted reducer from being properly installed out of round misaligned bent all the above

all the above

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

true

the space between the gear sets mating teeth at the root is called the backlash working depth clearance pressure angle

clearance

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 formed point at the tooth profile centre

which of the following gear type reduces the thrust simple helical miter double helical spiral bevel

double helical

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

th pitch circle diameter plus 2 addendums

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

true

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

8 teeth per inch of the gears pitch circle diameter

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

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

use a stainless steel chain for wet and corrosive conditions true false

true

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

all the above

a slip fit master link decreases the strength of the chain by ____% 10 20 30 40