Chemical Engineering - Chemical Engineering Basics

31. 

Thermit welding is categorised as the __________ welding.

A. forge
B. fusion
C. resistance
D. arc

Answer: Option B

Explanation:

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32. 

A gas having a negative Joule-Thompson co-efficient, when throttled, will

A. become hotter.
B. become cooler.
C. remain unchanged.
D. liquefy.

Answer: Option A

Explanation:

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33. 

Annealing of metal does not

A. precede its wire drawing.
B. induce softness and removes stresses & dissolved gases.
C. refine the crystalline structure & produce a definite microstructure.
D. alter toughness, ductility and magnetic & electrical or other physical properties.

Answer: Option A

Explanation:

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34. 

Which of the following is a common constituent of both paint and oil varnish ?

A. Extender
B. Pigment
C. Thinner
D. Drying oil

Answer: Option D

Explanation:

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35. 

Lithium is a useful alloying addition to aluminium, because it

A. is cheap.
B. imparts solid solution strengthening.
C. lowers density and contributes to age hardening.
D. improves the corrosion resistance of aluminium.

Answer: Option D

Explanation:

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