Chemical Engineering - Chemical Engineering Basics

26. 

__________ welding will be the most suitable for butt welding two 20 cms thick boiler drum mild steel plates.

A. Electrical resistance
B. Electroslag
C. Plasma torch
D. Submerged arc

Answer: Option B

Explanation:

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27. 

Machinability of hard alloys & tool steels is improved by

A. spherodising
B. annealing
C. tempering
D. normalising

Answer: Option B

Explanation:

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28. 

LASER

A. stands for Light Amplification by Stimulated Emission of Radiation.
B. has the same intensity as visible light.
C. can't be used for cutting metals.
D. none of these.

Answer: Option A

Explanation:

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29. 

__________ forces do not act in case of fluids.

A. Vibratory
B. Centrifugal
C. Elastic
D. Tensile

Answer: Option D

Explanation:

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30. 

Which of the following is not a natural abrasive ?

A. Silicon carbide
B. Quartz
C. Corundum
D. Emery

Answer: Option A

Explanation:

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