Machine Design Questions and Answers – Bolt of Uniform Strength & Locking devices

This set of Machine Design Multiple Choice Questions & Answers (MCQs) focuses on “Bolts of Uniform Strength & Locking Devices”.

1. Resilience is defined as the property of material to absorb energy when deformed _________ and to release this energy when unloaded.
a) Elastically
b) Plastically
c) Up to fracture point
d) None of the listed

Explanation: It is the definition of resilience.

2. The shock absorbing capacity of bolt can be increased by making the shank diameter ________ the root diameter.
a) Lesser than
b) Equal to
c) Greater than
d) No effect

Explanation: If shank diameter is equal to the thread diameter than, the shank is subjected to higher stress and thus absorbs a great portion of strain energy and relieves the thread portion of high stress.

3. The shock absorbing capacity of bolts can be increased by
a) Increasing the shank diameter
b) Decreasing the length of shank portion of bolt
c) Increase the shank diameter and decreasing the length of shank
d) None of the listed

Explanation: Shock absorbing capacity can be increased by decreasing the shank diameter or increasing the length of shank.

4. If the length of the shank is doubled, then strain energy absorbed by shank
a) Doubles
b) Remains same
c) Increases 4 time
d) Become half

Explanation: Strain energy absorbed by shank is linearly proportional to its length.

5. Which of the following help in accomplishing the locking?
a) Creating supplementary friction
b) Using special locking devices like split pins
c) By plastic deformation
d) All of the listed

Explanation: All the methods can be employed to lock the screw.
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6. Crests and roots of the threads may lead to leakage in fluid tight threads if flattened or rounded to a circular arc.
a) True
b) False

Explanation: As there is engagement in the threads, chances of leakage are reduced.

a) True
b) False

a) Equal to
b) Greater than
c) Lesser than
d) There is no relation

Explanation: Finer threads have lower helix angle.

9. Which threads have greater resistance to unscrewing?
a) Coarse
b) Fine
c) They have equal resistance
d) Cannot be determined

Explanation: Fine threads have greater resistance to unscrewing as a result of lower helix angle.

c) Either of fine or coarse
d) None of the listed

Explanation: Fine threads have lesser helix angle and hence greater resistance for unscrewing and thus are recommended for fluctuating loads.

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