MCQs on Bolt of Uniform Strength & Locking devices
1 - Question
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
View Answer
Answer: a
Explanation: It is the definition of resilience.
2 - Question
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
View Answer
Answer: b
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 - Question
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
View Answer
Answer: d
Explanation: Shock absorbing capacity can be increased by decreasing the shank diameter or increasing the length of shank.
4 - Question
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
View Answer
Answer: a
Explanation: Strain energy absorbed by shank is linearly proportional to its length.
5 - Question
Answer: a Explanation: Strain energy absorbed by shank is linearly proportional to its length.
a) Creating supplementary friction
b) Using special locking devices like split pins
c) By plastic deformation
d) All of the listed
View Answer
Answer: d
Explanation: All the methods can be employed to lock the screw.
6 - Question
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
View Answer
Answer: b
Explanation: As there is engagement in the threads, chances of leakage are reduced.
7 - Question
The static load carrying capacity of fine threads is greater than that of coarse threads.
a) True
b) False
View Answer
Answer: b
Explanation: Coarse threads have a higher load carrying capacity.
8 - Question
Coarse threads have helix angle _____ fine threads.
a) Equal to
b) Greater than
c) Lesser than
d) There is no relation
View Answer
Answer: c
Explanation: Finer threads have lower helix angle.
9 - Question
Which threads have greater resistance to unscrewing?
a) Coarse
b) Fine
c) They have equal resistance
d) Cannot be determined
View Answer
Answer: b
Explanation: Fine threads have greater resistance to unscrewing as a result of lower helix angle.
10 - Question
Which type of threads is recommended for fluctuating loads?
a) Fine threads
b) Coarse Threads
c) Either of fine or coarse
d) None of the listed