# Machine Design Questions and Answers – Belt Drives

This set of Machine Design Multiple Choice Questions & Answers (MCQs) focuses on “Belt Drives”.

1. Belt, chain and rope are called rigid drives.
a) True
b) Belt is a flexible drive only
c) All three are flexible drives
d) None of the listed

Explanation: They all are flexible drive examples.

2. In flexible drives, rotary motion of driving shaft is directly converted to rotary motion of driven shafts
a) Yes
b) No, translator motion is involved
c) No, Cylindrical motion is involved
d) No, Parabolic motion is involved

Explanation: It is first converted into translator and then into rotary.

3. Flexible drive can absorb shock loads and damp vibrations.
a) True
b) No
c) Depends on the load applied
d) Doesn’t damp vibrations

Explanation: Intermediate link is long and flexible.

4. Velocity ratio in both flexible and rigid drive is constant.
a) True
b) False

Explanation: In flexible drive, velocity ratio is not constant.

5. Is there any worry for overloading conditions in flexible belt drives?
a) Yes
b) No
c) Only after a particular threshold limit
d) Depends on external factrors

Explanation: In case of overloading, belt slips over the pulley and hence protect it from the overload.
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6. V belts have v shaped cross section.
a) No, rectangular
b) No, trapezium
c) No, circular
d) No, spherical

Explanation: They have trapezoidal cross section.

7. The force of friction between belt and V grooved pulley is high.
a) Yes, supported by wedge action
b) No
c) There is no wedge action involved
d) None of the listed

Explanation: Due to wedge action, force of friction is high.

8. V belts result in smooth and quite operation even at high speeds.
a) Yes
b) No they are very noisy
c) They are not endless and hence not smooth motion
d) None of the listed

Explanation: V belts are endless.

9. The efficiency of flat belt drive is 35%. If all the parameters are same and flat belt is replaced by V belt, than the efficiency of V belt will be?
a) <35%
b) >35%
c) =35%
d) Cant be determined

Explanation: The efficiency of flat belt drive is more that V belt drive.

10. There is problem of bending stress in the V belt drive.
a) True
b) False

Explanation: The ratio of cross sectional height to pulley diameter is high.

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