# Machine Kinematics Questions and Answers – Advantages and Disadvantages of Chain Drive Over Belt or Rope Drive

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This set of Machine Kinematics Multiple Choice Questions & Answers (MCQs) focuses on “Advantages and Disadvantages of Chain Drive Over Belt or Rope Drive”.

1. The advantages of the V-belt drive over flat belt drive are
a) The V-belt drive gives compactness due to the small distance between the centres of pulleys.
b) The drive is positive, because the slip between the belt and the pulley groove is negligible.
c) Since the V-belts are made endless and there is no joint trouble, therefore the drive is smooth.
d) all of the mentioned

Explanation: Following are the advantages of the V-belt drive over flat belt drive:
a) The V-belt drive gives compactness due to the small distance between the centres of pulleys.
b) The drive is positive, because the slip between the belt and the pulley groove is negligible.
c) Since the V-belts are made endless and there is no joint trouble, therefore the drive is smooth.
d) It provides longer life, 3 to 5 years.
e) It can be easily installed and removed.
f) The operation of the belt and pulley is quiet.
g) The belts have the ability to cushion the shock when machines are started.
h) The high velocity ratio (maximum 10) may be obtained.
i) The wedging action of the belt in the groove gives high value of limiting ratio of tensions.

2. The disadvantages of the V-belt drive over flat belt drive are
a) The V-belt drive cannot be used with large centre distances.
b) The V-belts are not so durable as flat belts.
c) The construction of pulleys for V-belts is more complicated than pulleys for flat belts.
d) all of the mentioned

Explanation: Following are the disadvantages of the V-belt drive over flat belt drive :
a) The V-belt drive cannot be used with large centre distances.
b) The V-belts are not so durable as flat belts.
c) The construction of pulleys for V-belts is more complicated than pulleys for flat belts.
d) Since the V-belts are subjected to certain amount of creep, therefore these are not suitable for constant speed application such as synchronous machines, and timing devices.
e) The belt life is greatly influenced with temperature changes, improper belt tension and mismatching of belt lengths.
f) The centrifugal tension prevents the use of V-belts at speeds below 5 m/s and above 50m/s.

3. The advantages of the V-belt drive over flat belt drive are
a) It provides longer life, 3 to 5 years.
b) It can be easily installed and removed.
c) The operation of the belt and pulley is quiet.
d) all of the mentioned

Explanation: Following are the advantages of the V-belt drive over flat belt drive:
a) The V-belt drive gives compactness due to the small distance between the centres of pulleys.
b) The drive is positive, because the slip between the belt and the pulley groove is negligible.
c) Since the V-belts are made endless and there is no joint trouble, therefore the drive is smooth.
d) It provides longer life, 3 to 5 years.
e) It can be easily installed and removed.
f) The operation of the belt and pulley is quiet.
g) The belts have the ability to cushion the shock when machines are started.
h) The high velocity ratio (maximum 10) may be obtained.
i) The wedging action of the belt in the groove gives high value of limiting ratio of tensions.
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4. The disadvantages of the V-belt drive over flat belt drive are
a) Since the V-belts are subjected to certain amount of creep, therefore these are not suitable for constant speed application such as synchronous machines, and timing devices.
b) The belt life is greatly influenced with temperature changes, improper belt tension and mismatching of belt lengths.
c) The centrifugal tension prevents the use of V-belts at speeds below 5 m/s and above 50m/s.
d) all of the mentioned

Explanation: Following are the disadvantages of the V-belt drive over flat belt drive :
a) The V-belt drive cannot be used with large centre distances.
b) The V-belts are not so durable as flat belts.
c) The construction of pulleys for V-belts is more complicated than pulleys for flat belts.
d) Since the V-belts are subjected to certain amount of creep, therefore these are not suitable for constant speed application such as synchronous machines, and timing devices.
e) The belt life is greatly influenced with temperature changes, improper belt tension and mismatching of belt lengths.
f) The centrifugal tension prevents the use of V-belts at speeds below 5 m/s and above 50m/s.

5. The distance between the hinge centre of a link and the corresponding hinge centre of the adjacent link is called
a) pitch of the chain
b) bush roller chain
c) block chain
d) none of the mentioned

Explanation: A bush roller chain, consists of outer plates or pin link plates, inner plates or roller link plates, pins, bushes and rollers.
The distance between the hinge centre of a link and the corresponding hinge centre of the adjacent link is called pitch of the chain.

6. Industrial rotors will not have uniform diameter throughout their lengths.
a) True
b) False

Explanation: Industrial rotors are not uniform, because of fitment of pulleys, gears, belt etc.

a) True
b) False

Explanation: During multi-start thread cutting operation, speed is reduced to one-third to one-fourth of that in turning operation.

8. Which one of the following is a positive drive?
a) Crossed flat belt drive
b) Rope drive
c) V-belt drive
d) Chain drive

Explanation: The chains are mostly used to transmit motion and power from one shaft to another, when the centre distance between their shafts is short such as in bicycles, motor cycles, agricultural machinery, conveyors, rolling mills, road rollers etc.

9. The chain drive transmits ____________ power as compared to belt drive.
a) more
b) less
c) equal
d) none of the mentioned

Explanation: Following are the advantages and disadvantages of chain drive over belt or rope drive:
1. As no slip takes place during chain drive, hence perfect velocity ratio is obtained.
2. Since the chains are made of metal, therefore they occupy less space in width than a belt or rope drive.
3. It may be used for both long as well as short distances.
4. It gives a high transmission efficiency (upto 98 percent).
5. It gives less load on the shafts.
6. It has the ability to transmit motion to several shafts by one chain only.
7. It transmits more power than belts.
8. It permits high speed ratio of 8 to 10 in one step.
9. It can be operated under adverse temperature and atmospheric conditions.

10. The relation between the pitch of the chain (p) and pitch circle diameter of the sprocket (D) is given by
a) p = D sin(900/T)
b) p = D sin(1200/T)
c) p = D sin(1800/T)
d) p = D sin(3600/T)

Explanation: None.

11. In order to have smooth operation, the minimum number of teeth on the smaller sprocket, for moderate speeds, should be
a) 15
b) 17
c) 21
d) 25

Explanation: In order to have smooth operation, the minimum number of teeth on the smaller sprocket or pinion may be taken as 17 for moderate speeds and 21 for high speeds.

12. The speed of the sprocket reduces as the chain pitch _____________ for a given number of teeth.
a) increases
b) decreases
c) remains same
d) none of the mentioned

Explanation: The r.p.m. of the sprocket reduces as the chain pitch increases for a given number of teeth.

13. The greater angle of articulation will increase the life of the chain.
a) True
b) False