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IKING 2 > MOD 5.1 > Flashcards

MOD 5.1 Flashcards

1
Q

Flat belt that is too tight will induce
undue strain on the bearing and the belt:
A. Life will be decreased C. Suffers
B. Life will be increased D. Will be sheared

A

A

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2
Q

Type of leather belt being applied with
a water proof cement.
A. Mineral tanned C. Oak-mineral tanned
B. Oak tanned D. All of these

A

B

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3
Q

Test showed that steel pulleys have less
slippage than that of cast iron pulleys in range of:
A. 1.8 - 3.6 C. 2.35 - 2.70
B. 1.6 - 2.8 D. 2.00 - 2.80

A

C

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4
Q

It is advised that in rubber belts
application/mounting, it should have an initial tension of:
A. 18 to 24 lb/in-ply C. 12 to 15 lb/in-ply
B. 15 to 20 lb/in-ply D. 10 to 14 lb/in-ply

A

C

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5
Q

The movement of belt upon the face of rim
or outer surface of the driver and the driven pulleys within
the area of arc of contact.
A. Creep C. Interference
B. Crowning D. Slip

A

A

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6
Q

What is the recommended speed for leather
belts?
A. 4500 to 5600 fpm C. 6000 to 7000 fpm
B. 5000 to 6000 fpm D. 7000 to 8000 fpm .

A

D

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7
Q

Which of the following is the approximate
density of the leather belt?
A. 0.025 lb/in3 C. 0.0135 lb/in3
B. 0.035 lb/in3 D. 0.0465 lb/in

A

B

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8
Q

Which of the following is the approximate
density of the rubber belt?
C. 0.025 lb/in3 C. 0.045 lb/in3
D. 0.035 lb/in3 D. 0.065 lb/in3

A

C

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9
Q

t is advised that in rubber belts application
mounting, it should have an initial tension of _____ lb per
inch-ply.
A. 15 to 20 C. 25 to 30
B. 20 to 25 D. 30 to 40

A

A

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10
Q

The breaking strength of oak-tanned beltings
varies from 3 to more than:
A. 5 ksi C. 7 ksi
B. 6 ksi D. 9 ksi

A

B

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11
Q

The tension in the belt due to centrifugal
force increasing rapidly above about:
A. 1500 fpm C. 3000 fpm
B. 2500 fpm D. 3500 fpm

A

B

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12
Q

Initial tension should range from ______ for
leather belts and 10 to 12 lb/ply per inch of width of rubber
belts.
A. 200 to 240 psi C. 280 to 330 psi
B. 220 to 260 psi D. 300 to 350 psi

A

A

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13
Q

What is the recommended speed for fabric
belts?
A. 2000 to 3000 fpm C. 4000 to 5000 fpm
B. 3000 to 4000 fpm D. 5000 to 6000 fpm

A

C

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14
Q

For fabric belts recommended speed is:
A. 2000 fpm or more C. 4000 rpm or more
B. 3000 fpm or more D. 5000 rpm or more

A

A

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15
Q

In shear pin or breaking pin design, we may
use the data experienced by link-belt for 1/8 inch to 1 inch
pins and the breaking stress is ____ ksi.
A. 36 C. 66
B. 50 D. 80

A

B

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16
Q

) On high speed centrifugal blowers, it has
been observed that the arc of contact reduced from 180° at
rest to _____ in motion.
A. 110° C. 150°
B. 120° D. 160°

A

A

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17
Q

Too much ____ in a flat belt operation tends
to cause excessive wear and slippage and may burn the belt.
A. Ply C. Stiffness
B. Slack D. Tightness

A

B

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18
Q

Belt slip may take place because of:
A. Loose load C. Driving pulley too small
B. Heavy belt D. All of the above

A

D

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19
Q

Flat-belt that is too tight will induce strain
on the bearing and belt:
A. Life will be shortened C. Uneconomical operation
B. Suffer or shafter D. Will be sheared/cut

A

A

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20
Q

In case of flat belt drive the length of belt in
case of:
A. Cross belts depends on the difference of the diameters
of pulleys
B. Cross belts depends on the sum of the diameters of
pulleys
C. Open belt depends on sum of the diameters of pulleys
D. Open belts depends on difference of the diameters of
pulleys

A

B

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21
Q

The use of flat belt pulley is limited to:
A. 4500 fpm C. 6000 fpm
B. 5200 fpm D. 8500 fpm

A

C

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22
Q

What belt speeds requires dynamics
balancing?
A. More than 1,800 fpm C. More than 5,000 fpm
B. More than 3,000 fpm D. More than 6,000 fpm

A

B

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23
Q

Which of the following material is not used
for flat belt pulleys?
A. Brass C. Paper
B. Cast iron D. Wood

A

A

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24
Q

A type of flat belt which is acid and
waterproof and cannot withstand temperature higher than
100 °C.
A. Balata belts C. Steel belts
B. Rubber belts D. Textile belts

A

A

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25
Q

Balata belt is about _____ stronger than
rubber.
A. 15 % C. 25 %
B. 20 % D. 30 %

A

c

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26
Q

What type of leather belting should be used
at an ambient temperature above 140 °F and possible acid
liquid coming in contact with the belt?
A. Mineral tanned C. Either A or B
B. Oak tanned D. Neither A nor B

A

d

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27
Q

The recommended net belt pull for rubber
belt is:
A. 10.75 lb/ply per inch of width
B. 13.75 lb/ply per inch of width
C. 16.75 lb/ply per inch of width
D. 20.75 lb/ply per inch of width

A

b

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28
Q

According to the Goodrich company, the
permissible net belt pull is ________ that it gives a simple
means of quick estimation.
A. 10.75 lb/ply per inch of width
B. 13.75 lb/ply per inch of width
C. 16.75 lb/ply per inch of width
D. 20.75 lb/ply per inch of width

A

b

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29
Q

The material suitable for the belts used in
agricultural equipment is:
A. Balata gum C. Leather
B. Cotton D. Rubber

A

D

30
Q

The maximum center distances of pulleys
should be about ______ times the pitch diameter of the
smaller pulley.
ANSWER:
A. 6 to 9 C. 15 to 20
B. 10 to 14 D. 21 to 27

A

C

31
Q

A type of flexible transmitting element that
offers long life, high efficiency, and low cost and low
maintenance.
A. Flat belt C. V-belt
B. Round belt D. V-flat belt

A

A

32
Q

In order to obtain good results with flat belts,
the maximum distance between the shafts should not
exceed 10 meters and the minimum should not be less than
____ times the diameter of the larger pulley.
A. 1.5 C. 3.5
B. 2.5 D. 4.5

A

C

33
Q

Round belts are used singly, as from _______
mm the minimum allowable ratio of the diameter of smaller
pulley to the belt diameter is about 20, the recommended
ratio is 30.
A. 2 to 6 C. 4 to 8
B. 4 to 10 D. 5 to 10

A

C

34
Q

These are made of cotton and are used for
rough and short service.
C. Balata belts C. Steel belts
D. Rubber belts D. Textile belts

A

D

35
Q

The amount of crowning a pulley varies from ____ of pulley
face to ¼-in/ft of pulley face.
A. 1/32-inch per ft C. 1/8-inch per ft
B. 1/16-inch per ft D. 3/16-inch per ft

A

B

36
Q

For most drive systems, a velocity ratio of 8:1 is the largest
that should be attempted with a single reduction drive, and
____ is a reasonable maximum.
A. 5:1 C. 7:1
B. 6:1 D. 8:1

A

B

37
Q

The minimum wrap angle of approximately _____, which is
generally sufficient for friction drives and will ensure that
positive drive belts do not jump teeth.
A. 110° C. 120°
B. 130° D. 140°

A

C

38
Q
  1. The layer of a belt is generally called:
    A. Ply C. Layer
    B. Segment D. Sediment
A

A

39
Q

The best leather has an ultimate strength of about:
A. 6,000 psi C. 4,000 psi
B. 5,000 psi D. 2,000 psi

A

C

40
Q

First-grade belts have a minimum strength of?
A. 2500 psi C. 3000 psi
B. 3500 psi D. 4000 psi

A

C

41
Q

The factor of safety of ____ is usually used with leather
belts?
A. 8 C. 9
B. 10 D. 11

A

B

42
Q

A two ply belt will have its capacity reduced by?
A. 70% C. 75%
B. 80% D. 85%

A

C

43
Q

A three ply flat belt will have its capacity reduced by?
A. 70% C. 75%

A

D

44
Q

The horsepower transmitted by any inclined belt should be
reduced from that of an equivalent horizontal belt by ____
for each degree of inclination exceeding 60 degrees.
A. 1% C. 2%
B. 3% D. 4%

A

A

45
Q

This type of flat belt is made from folded canvas duck with
layers of rubber between and surrounding the whole belt
structure.
A. Canvas C. Fabric
B. Rubber D. Leather

A

B

46
Q

Is made like rubber belt except that a type of gum is
substituted for rubber, and is not vulcanized?
A. Duck C. Balata
B. Paper D. Chromium

A

C

47
Q

It is cheaper than leather belt but is affected by light, heat,
and oil deteriorates with age even when in service?
A. Canvas C. Fabric
B. Rubber D. None of these

A

B

48
Q

First-grade belts of double-ply have an average strength of?
A. 3500 psi C. 3750 psi
B. 4000 psi D. 4250 psi

A

A

49
Q

First-grade belts of single-ply have an average strength of
A. 3000 psi C. 3250 psi
B. 3500 psi D. 3750 psi

A

D

50
Q

The arc of contact in belts should never be less than ______
degrees, and in practice it is found that the arcs less than
_____ degrees require high belt tension.
A. 150, 160 C. 155, 165
B. 160,170 D. 165,175

A

C

51
Q

In the selection of the proper belt, it is not considered good
practice to use single-ply belts, more than _____ wide.
A. 8 C. 12
B. 10 F. 15

A

A

52
Q

The density of a balata belt is:
A. 0.40 lb/in3 C. 0.45 lb/in3
B. 0.42 lb/in3 D. 0.48 lb/in3

A

B

53
Q

The suitable initial tension for leather belts is?
A. 150-175 psi C. 175-200 psi
B. 200-225 psi D. 225-250 psi

A

B

54
Q

The expression that can be used to estimate the effect of
initial tension Fo on the power tension is?
A. √F1 + √F2 = √Fo
C. √F1 + √F2 = 2√Fo
B. √F1 - √F2 = √Fo
D. √F1 - √F2 = 2√Fo

A

C

55
Q

Belt velocities used in practice for maximum power and
economy range from?
A. 2000-3000 fpm C. 3000-4000 fpm
B. 4000-5000 fpm D. 5000-6000 fpm

A

D

56
Q

The advantage of flat belting over other flexible transmitting
elements is:
A. It allows long distances between shafts
B. It can be used in dusty and abrasive environments
C. It can be used with high speed drives
D. All of the above

A

D

57
Q

The tension ratio (F1/F2) of flat belt that gives maximum
power is:
A. 2 C. 4
B. 3 D. 5

A

B

58
Q

If the pulley ratio is 9:1 or more, the reduction should be:
A. 25 % C. 60 %
B. 50 % D. 75 %

A

B

59
Q

Two shafts at right angles to each other may be connected
by the ______ arrangement.
A. Open belt C. Quarter turn
B. Cross belt D. Stepped

A

C

60
Q

A crossed belt wider than ___ inches should be avoided.
A. 4 C. 8
B. 6 D. 12

A

C

61
Q

If two intersecting shafts are to be belt connected, how
many guide pulley is/are used?
A. 1 C. 3
B. 2 D. 4

A

B

62
Q

If the ends of the leather belts are joined by wire, what is
usual joint efficiency?
A. 100 % C. 92 %
B. 96 % D. 88 %

A

D

63
Q

Based on experience, what is the most economical belt
speed of leather belts?
A. 3,000 to 4,000 fpm C. 5000 to 7000 fpm
B. 4,000 to 4,500 fpm D. 6000 to 7500 fpm

A

B

64
Q

Creep is the slight absolute motion of the belt as it passes
over the pulleyvi
.
A. It is absolute motion C. Yes
B. No, it is a relative motion D. None of these

A

B

65
Q

A _____ slip is satisfactory for leather (flat belts) on steel or
iron pulley.
A. 1.5 % C. 2.5 %
B. 2.0 % D. 4.0 %

A

B

66
Q

Slip in a belt occurs when the frictional grip between the
belt and pulley is:
A. Sufficient C. Adequate
B. Insufficient D. Satisfactory

A

B

67
Q

Synchronous belt drives are generally pre-tensioned to
operate dynamically at a _____ tension ratio in order to
provide the best possible performance.
A. 4:1 C. 6:1
B. 5:1 D. 7:1

A

B

68
Q

The life expectancy of belts selected in accordance with the
leather belts formula hp per inch should be:
A. 2-4 years C. 4-6 years
B. 3-5 years D. 5-7 years

A

D

69
Q

The net belt pull on flat belts is given by:
A. 1 + F1/F2 C. F1 – F2
B. F1 + F2 D. (F1 + F2)/2 + 1

A

C

70
Q

The bending force on flat belts is given by:
A. 1 + F1/F2
C. F1 – F2
B. F1 + F2
D. (F1 + F2)/2 + 1

A

B

IKING 2 (10 decks)

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