Manufacturing Science: Previous Years’ Objective Questions

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26. In atomic hydrogen, welding hydrogen acts as-

A. a lubricant to increase the flow characteristics of weld material

B. a heating agent

C. one of the gases to generate the flame

D. an effective shielding gas protecting the weld

Click for Answer/Explanation

Correct Answer is A

H2 dissociates into two H+ atoms on passing through an electron arc. Now being highly reactive the atomic hydrogen is able to break the oxides on the base metal and hence allowing to form a clean weld.

27. A small amount of carbonaceous material sprinkled on the inner surface of mould cavity is called-

Read More- Theory of Machines: Simple Mechanisms-2

A. Green sand

B. Dry sand

C. Facing sand

D. Backing sand

Click for Answer/Explanation

Correct Answer is C

Carbonaceous materials like pitch, graphite, etc.

28. What is the number of jaws in self-centered chuck?

A. 3

B. 6

C. 9

D. 8

Click for Answer/Explanation

Correct Answer is A

29. USM has a good machining performance for-

A. Al

B. Steel

C. Refractory material

D. Superalloys

Click for Answer/Explanation

Correct Answer is C

USM – Ultrasonic Machining – for Armature winding

We will soon upload more Manufacturing Science Objective Questions.

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