250+ TOP MCQs on Transmission Shafts and Answers

Machine Design Multiple Choice Questions on “Transmission Shafts”.

1. The shaft is always stepped with ________ diameter at the middle portion and __________ diameter at the shaft ends.
a) Minimum, maximum
b) Maximum, minimum
c) Minimum, minimum
d) Zero, infinity
Answer: b
Clarification: Maximum diameter is in the middle portion while it is minimum at the ends.

2. ______ is used for a shaft that supports rotating elements like wheels, drums or rope sleaves.
a) Spindle
b) Axle
c) Shaf
d) None of the listed
Answer: a
Clarification: That is axle and not a spindle.

3. Axle is frequently used in torque transmission.
a) True
b) False
Answer: b
Clarification: Axle is a shaft supporting rotating elements.

4. Is it necessary for an axle to be ______ with respect to rotating element?
a) Stationary
b) Moving
c) Moving or stationary
d) None of the listed
Answer: c
Clarification: The axle may be stationary or rotate with the element.

5. Counter shaft is a secondary shaft.
a) True
b) False
Answer: a
Clarification: It is a secondary shaft used to counter the direction of main shaft.

6. Hot rolling produces a stronger shaft then cold rolling.
a) True
b) False
Answer: b
Clarification: Cold rolling produces stronger shaft as grain structure isn’t deformed in cold working.

7. Shafts are subjected to ______ forces.
a) Compressive
b) Tensile
c) Shear
d) None of the listed
Answer: b
Clarification: Shafts are subjected to tensile forces.

8. Which of the following act on shafts?
a) Torsional moment
b) Bending Moment
c) Both torsional and bending
d) None of the mentioned
Answer: c
Clarification: Shaft is subjected to torsional moment as well as bending moment.

9. When the shaft is subjected to pure bending moment, the bending stress is given by?
a) None of the listed
b) 32M/πdᵌ
c) 16M/πdᵌ
d) 8M/πdᵌ
Answer: b
Clarification: Stress =My/I where y=d/2 and I=πd⁴/64.

10. When the shaft is subjected to pure torsional moment, the torsional stress is given by?
a) None of the listed
b) 32M/πdᵌ
c) 16M/πdᵌ
d) 8M/πdᵌ
Answer: c
Clarification: Stress=Mr/J where r=d/2 and J=πd⁴/64.