Mechanical Engineering - Workshop Technology

31. 

The purpose of a riser is to

A. deliver molten metal into the mould cavity
B. act as a reservoir for the molten metal
C. feed the molten metal to the casting in order to compensate for the shrinkage
D. deliver the molten metal from pouring basin to gate

Answer: Option C

Explanation:

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32. 

The blank diameter used in thread rolling will be

A. equal to minor diameter of the thread
B. equal to pitch diameter of the thread
C. a little larger than the minor diameter of the thread
D. a little larger than the pitch diameter of the thread

Answer: Option C

Explanation:

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33. 

The cross-section of a chisel is usually

A. rectangular
B. square
C. hexagonal
D. octagonal

Answer: Option D

Explanation:

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34. 

A plug gauge is used to check the diameter of shafts and studs.

A. Correct
B. Incorrect

Answer: Option B

Explanation:

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35. 

In back-hand welding, the angle between the welding torch and the work is kept as

A. 30°-40°
B. 40°-50°
C. 50°-60°
D. 60°-70°

Answer: Option B

Explanation:

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