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IKING 2 > 6 > Flashcards

6 Flashcards

1
Q

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

A

C

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2
Q

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

A

A

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3
Q

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

A

B

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4
Q

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

A

C

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5
Q

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

A

C

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6
Q

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

A

A

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7
Q

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

A

D

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8
Q

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

A

B

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9
Q

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

A

A

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10
Q

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

A

C

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11
Q

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

A

C

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12
Q

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

A

D

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13
Q

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

A

B

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14
Q

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

A

B

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15
Q

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

A

C

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16
Q

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

A

C

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17
Q

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

A

D

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18
Q

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

A

C

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19
Q

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

A

A

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20
Q

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

A

D

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21
Q

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

A

A

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22
Q

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

A

D

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23
Q

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

A

C

24
Q

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

A

C

25
Q

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

A

B

26
Q

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

A

D

27
Q

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

A

B

28
Q

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

A

A

29
Q

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

A

B

30
Q

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

A

C

31
Q

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

A

D

32
Q

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

A

A

33
Q

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

A

C

34
Q

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

A

A

35
Q

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°

A

A

36
Q

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

A

B

37
Q

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

A

C

38
Q

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

A

C

39
Q

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

A

B

40
Q

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

A

D

41
Q

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

A

C

42
Q

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

A

A

43
Q

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

A

C

44
Q

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

A

B

45
Q

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

A

A

46
Q

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

A

B

47
Q

. 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

A

A

48
Q

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°

A

B

49
Q

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

A

C

50
Q

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

A

A

51
Q

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

A

D

52
Q

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

A

B

53
Q

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

A

D

54
Q

. 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

A

A

55
Q

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

A

C

56
Q

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

A

A

57
Q

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

A

C

IKING 2 (10 decks)

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