6

Question 1

Which of the following device is used for
transmitting energy in CNC machine tools?
A. Gears
B. Pulley and belt
C. Recirculating ball screw and nut assembly
D. Screw and nut assembly

Answer 1

C

Question 2

In a chain drive design for large speed
reduction, it is preferable to use a double reduction or compound type of transmission instead of single two
sprockets transmission. Drives should type be so designed
that the angle between two tight chain strands does not
exceed _____ degrees.
A. 45 C. 55
B. 60 D. 90

Answer 2

A

Question 3

Pitch diameter less the diameter of the
roller is equal to:
A. Addendum C. Face overlap
B. Bottom diameter D. Top land

Answer 3

B

Question 4

The recommended center distance of
sprockets should not be less than ____ times the diameter
of bigger sprocket.
A. 1.75 C. 1.5
B. 2 D. 2.25

Answer 4

C

Question 5

For large speed ratio and large sprocket
utilized it is recommended cast material since the large
sprocket teeth are having fewer engagement.
A. Alloy steel C. Iron
B. Heat treated steel D. Malleable iron

Answer 5

C

Question 6

In roller chain drive, longer distance can
cause catenary tension in the operation; the ideal distance
is about:
A. 80 pitches C. 100 pitches
B. 90 pitches D. 120 pitches

Answer 6

A

Question 7

As a rule, the center-to-center distance
between sprocket should not be less than ____ times the
distance bigger sprocket and not less than 30 times the
pitch nor more than about 50 times the pitch.
A. 2.0 C. 3.0
B. 2.5 D. 1.5

Answer 7

D

Question 8

The minimum number of teeth
recommended in the design of the small sprocket in any
application.
A. 5 to 11 C. 12 to 16
B. 18 to 24 D. 25 to 30

Answer 8

B

Question 9

The ideal limit of teeth that sprockets
can have in an operation is ___/___ (min/max).
A. 17/127 C. 20/130
B. 12/80 D. 10/15

Answer 9

A

Question 10

Rigid link is a setup of _______ chain.
A. Drive/driven hydraulic ram
B. Drive/driven pulleys with conveyor
C. Drive/driven sprockets wi

Answer 10

C

Question 11

Maximum number of teeth in a large or
driven sprocket.
A. 143 C. 127
B. 130 D. 132

Answer 11

C

Question 12

As a rule, the center-to-center
distance between sprocket should not be less than ____
times the distance bigger sprocket and not less than 30
times the pitch nor more than about 50 times the pitch.
C. 2.0 C. 3.0
D. 2.5 D. 1.5

Answer 12

D

Question 13

It is recommended for high-speed
application that the minimum number of teeth in small
sprocket should be:
A. 12 to 20 C. 16 to 32
B. 18 to 24 D. 14 to 28

Answer 13

B

Question 14

Type D sprocket has _______ hub.
A. Left side C. No
B. Two sides D. One side

Answer 14

B

Question 15

Type A sprocket has _______ hub.
A. Left side C. No
B. Two sides D. one side

Answer 15

C

Question 16

) The recommended lubricant for chain
drive operation is:
A. Heavy grease C. Petroleum oil
B. Moly slip D. SAE 40W

Answer 16

C

Question 17

Consider the
maximum center distance of sprockets should be __ pitches.
Very long center distance cause catenary tension in the
chain.
A. 50 C. 70
B. 60 D. 80

Answer 17

D

Question 18

It is recommended not to have a direct drive
between driven and drive sprockets if the ratio of their teeth
exceeds _______, use 2 or more step combination.
A. 5 times C. 8 times
B. 6 times D. 10 times

Answer 18

C

Question 19

The maximum recommended ideal number
of teeth to use for bigger sprocket is:
A. 120 C. 132
B. 127 D. 145

Answer 19

A

Question 20

t is ideal for maximum quietness in sprocket
drive operation to choose ____ or more teeth.
A. 21 C. 25
B. 23 D. 27

Answer 20

D

Question 21

Which of the type of chain is used in
motorcycle?
A. Bush roller C. Pintle
B. Long D. Silent chain

Answer 21

A

Question 22

The working load P for a chain for crane
applications is expressed in terms of diameter of link “d” in
cm as follows
A. P = 15d2 C. P = 250d2
B. P = 25d2 D. P = 500d2

Answer 22

D

Question 23

It is a lubrication for roller chains wherein the
lubricant is supplied by a circulating pump capable of
supplying the chain drive with a continuous flow of oil inside
the chain loop evenly across the chain width and directly at
the slack strand.
A. Bath lubrication C. Oil stream lubrication
B. Drip lubrication D. Recirculated lubrication

Answer 23

C

Question 24

The chain operates above oil level, while a disk is submerged
into the lower oil level.
A. Oil bath lubrication C. Oil-ring lubrication
B. Force-feed lubrication D. Drip lubrication

Answer 24

C

Question 25

The proper amount of chain sag on the slack side of an installation is 1/4 in. for every _________ inches between sprocket centers. A. 10 C. 15 B. 12 D. 20

Answer 25

B

Question 26

Roller chains include the following parts: A. Roller links and pin links C. Bushings B. Rollers D. All of these

Answer 26

D

Question 27

A chain sprocket with a hub on both sides is a Type _____ sprocket; a sprocket with a hub on only one side is a Type _____ sprocket. A. A, B C. A, C B. C, B D. D, B

Answer 27

B

Question 28

What is the minimum number of teeth on a smaller sprocket very slow speed? A. 12 C. 21 B. 17 D. 23

Answer 28

A

Question 29

What is the minimum number of teeth on a smaller sprocket for low speed? A. 12 C. 21 B. 17 D. 23

Answer 29

B

Question 30

What is the minimum number of teeth on a smaller sprocket for moderate speed? A. 12 C. 21 B. 17 D. 23

Answer 30

C

Question 31

What is the minimum number of teeth on a smaller sprocket for high speed? A. 12 C. 21 B. 17 D. 25

Answer 31

D

Question 32

A flexible coupling Consist of essentially of two chain sprockets connected with short continuous length of roller or silent chains. A. Chain Coupling C. Oldham Coupling B. Flanged Coupling D. Universal Joint

Answer 32

A

Question 33

Which of the following is also known as silent chain? A. Block chain C. Inverted tooth chain B. Double roller chain D. Roller chain

Answer 33

C

Question 34

When used to identify a chain sprocket, the letters A, B, and C describe the: A. Hub characteristics C. Plate characteristics B. Pin characteristics D. Roller characteristics

Answer 34

A

Question 35

The center distance for chain drives may of course be relatively short, but a minimum wrap of ____ is desirable; this condition is inevitably met when the velocity ratio is < 3. A. 120° C. 136° B. 128° D. 148°

Answer 35

A

Question 36

The center-to-center distance between sprockets, as a rule should not be less than ____ times the diameter of the larger sprocket. A. 1.25 C. 2.0 B. 1.5 D. 2.5

Answer 36

B

Question 37

The maximum number of teeth in any driven sprocket should not exceed: A. 100 C. 114 B. 108 D. 120

Answer 37

C

Question 38

The center-to-center distance between sprockets, as a rule, it should not be less than ______ times the pitch nor more than 50 times the pitch. A. 20 C. 30 B. 25 D. 40

Answer 38

C

Question 39

In certain cases, a center distance equivalent to ___ pitches may be considered an approved maximum. A. 60 C. 100 B. 80 D. 120

Answer 39

B

Question 40

The chain should extend around at least 120° of the pinion circumferences, and this minimum amount of contact is obtained for all center distances provided the ratio is less than: A. 2.0:1 C. 3.0:1 B. 2.5:1 D. 3.5:1

Answer 40

D

Question 41

The center distance should be adjustable in order to take care of the slack due to elongation from wear and this range of adjustments should be at least ____ pitches. A. 1.25 C. 1.5 B. 1.75 D. 2.0

Answer 41

C

Question 42

The total length of a roller chain should be given in multiples of ______ the pitch, because the ends must be connected with an outside and inside link. A. 2 times C. 4 times B. 3 times D. 5 times

Answer 42

A

Question 43

The tolerance for length of a new chain subjected to the standard measuring load are allowed an over-length of ___ inch per foot, but must not be under-length. A. 1/64 C. 1/84 B. 1/72 D. 1/96

Answer 43

C

Question 44

The number of links of the chain should be always ______ since the number of teeth are odd. A. Odd C. Either A or B B. Even D. None of the above

Answer 44

B

Question 45

Chain drives with more than _____ sprockets, idlers, composite duty cycles, or other unusual conditions often require special consideration. A. two C. three B. four D. five

Answer 45

A

Question 46

Big chain sprocket wheels are designed with spokes/arms are generally elliptical in cross section with major axis ___ times the minor axis. A. 1.5 C. 2.5 B. 2.0 D. 3.0

Answer 46

B

Question 47

. It is recommended not to have a direct drive between driven and drive sprockets if the ratio of their teeth exceeds: A. 10 times C. 6 times B. 8 times D. 4 time

Answer 47

A

Question 48

The preferred position for a drive is that where a line between shaft centers is horizontal or inclined not more than: A. 30° C. 60° B. 45° D. 75°

Answer 48

B

Question 49

Consider a maximum safe center distance of sprockets should be ____ pitches since very long center distance caused catenaries tension in the chain. A. 60 C. 80 B. 70 D. 90

Answer 49

C

Question 50

Roller chain drives are available for ratios up to ____ and to transmit up to 520 kw at 550 rpm. A. 9:1 C. 18:1 B. 15:1 D. 21:1

Answer 50

A

Question 51

A light-weight machinery chain is designated as _____ has 0.306-inch diameter rollers and 0.141-inch pin-diameter and minimum ultimate tensile strength of 1,500 pounds. A. RC 25 C. RC 40 B. RC 35 D. RC 41

Answer 51

D

Question 52

A simple formula for determining how much chain elongation a sprocket can accommodate is _____ expressed as a percentage where N is the number of teeth on the largest sprocket in the drive system. A. 160/N C. 220/N B. 200/N D. 250/N

Answer 52

B

Question 53

The maximum achievable efficiency of the chain drives is: A. 85-88% C. 93%-95% B. 89%-92% D. 96%-98%

Answer 53

D

Question 54

. The sum of number of links and number of teeth of the chain roller sprocket is: A. Odd C. Either odd or even B. Even D. None of these

Answer 54

A

Question 55

What is the profile of the silent chain sprocket teeth? A. Rectangular C. Trapezoidal B. Circular D. Hyperbolic

Answer 55

C

Question 56

The recommended minimum center distance is given by the formula ________ since this formula is to be used as a guide for the MINIMUM center distance only due to required clearance dimensions and allowance for the final chain length to be an even number of pitches. A. C ≦ (2N + n)/6 C. C ≦ (2N + n)/8 B. C ≦ (2N + n)/7 D. C ≦ (2N + n)/10

Answer 56

A

Question 57

The roller chain lubricant that operates on 38°C to 49°C. A. SAE 30 C. SAE 40 B. SAE SW 30 D. SAE 50

Answer 57

C