Mechanical Engineering - Machine Design

31. 

Which of the following material has the maximum ductility?

A. Mild steel
B. Copper
C. Zinc
D. Aluminium

Answer: Option A

Explanation:

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32. 

When a bolt is subjected to shock loading, the resilience of the bolt should be considered in order to prevent breakage at the

A. head
B. shank
C. thread
D. middle

Answer: Option C

Explanation:

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33. 

In order to obtain the bolts of uniform strength, an axial hole is drilled through the head as far as the threaded portion such that the area of shank becomes equal to the root area of the thread.

A. True
B. False

Answer: Option A

Explanation:

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34. 

An open belt drive is used when

A. shafts are arranged parallel and rotate in the opposite directions
B. shafts are arranged parallel and rotate in the same directions
C. shafts are arranged at right angles and rotate in one definite direction
D. driven shaft is to be started or stopped whenever desired without interferring with the driving shaft

Answer: Option B

Explanation:

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35. 

In unilateral system of tolerance, the tolerance is allowed on

A. one side of the actual size
B. one side of the nominal size
C. both sides of the actual size
D. both sides of the nominal size

Answer: Option B

Explanation:

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