Chemical Engineering - Chemical Engineering Basics

36. 

Function of blow down valve in a boiler is to

A. maintain the drum level.
B. keep the drum pressure constant.
C. drain out the sludge from the drum.
D. empty the boiler during shutdown.

Answer: Option C

Explanation:

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37. 

Insulation of liquid surface can be achieved by __________ on top of its surface.

A. floating hollow polypropylene spheres
B. spraying alumina powder
C. putting cement
D. none of these

Answer: Option A

Explanation:

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38. 

Consider an ideal solution of components A and B. The entropy of mixing per mole of an alloy containing 50 wt% B is

A. R ln 2
B. -R ln 2
C. 3 R ln 2
D. -3R ln 2

Answer: Option A

Explanation:

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39. 

Out of the following, the lowest packing of atoms exists in __________ crystal lattice structure.

A. hexagonal close, packed (hcp)
B. face centred cubic (fcc)
C. body centred cubic (bcc)
D. simple cubic

Answer: Option D

Explanation:

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40. 

Cadmium in zinc leach liquor is removed by cementation using

A. zinc
B. iron
C. nickel
D. copper

Answer: Option A

Explanation:

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