Chemical Engineering - Chemical Engineering Basics

36. 

In cold working of metal as compared to its hot working

A. cracks and blow holes are eliminated.
B. ductility and impact strength improves.
C. appreciable strain hardening is produced.
D. yield stress, hardness and fatigue strength is not at all affected.

Answer: Option D

Explanation:

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37. 

__________ is the process used for setting up compressive stresses in the surface of a metal to improve its fatigue strength.

A. Lancing
B. Shot peening
C. Slugging
D. Spinning

Answer: Option B

Explanation:

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38. 

Mho's scale of hardness, which consists of 10 standard minerals is used for the measurement of __________ hardness.

A. scratch
B. indentation
C. dynamic
D. rebound

Answer: Option A

Explanation:

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39. 

Which of the following is a weak acid ?

A. HF
B. HCl
C. HI
D. HBr

Answer: Option A

Explanation:

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40. 

Pig iron is a product of

A. electric arc furnace
B. cupola
C. blast furnace
D. open hearth furnace

Answer: Option C

Explanation:

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