Chemical Engineering - Chemical Engineering Basics

21. 

__________ is not used as a material of construction in thermocouples.

A. Alumel
B. Rhodium
C. Constantan
D. Duralumin

Answer: Option D

Explanation:

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22. 

Coarse grained steels have

A. low toughness
B. no tendency to distort
C. high density
D. very high toughness

Answer: Option B

Explanation:

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23. 

Steel balls are manufactured by cold heading. After cold forming, they are subjected to

A. tempering
B. normalising
C. stress-relieving
D. artificial ageing

Answer: Option C

Explanation:

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24. 

Free oxygen is removed from boiler feed water, because it

A. reduces heat transfer co-efficient.
B. is corrosive.
C. causes explosion.
D. none of these.

Answer: Option B

Explanation:

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25. 

Out of the following, the materials having maximum magnetic permeability is

A. silicon steel (Si = 4%)
B. cast iron
C. wrought iron
D. mild steel

Answer: Option A

Explanation:

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