Chemical Engineering - Chemical Engineering Basics

11. 

Which of the following is not an ore of zinc?

A. Cerrusite
B. Franklinite
C. Calamine
D. Troosite

Answer: Option A

Explanation:

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12. 

Pressure gauges are never connected directly to the live steam line; rather a loop or syphon is interposed as close as possible to the pressure gauge. This is done to

A. avoid the overheating of the tubes & bellows which operate them to minimise error and damage.
B. form a seal of water by steam condensate to fill the tube or bellows at the pressure being measured.
C. both 'a' & 'b'.
D. avoid the static head error introduced by steam entry.

Answer: Option C

Explanation:

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13. 

Phosphorous is added to copper melt to

A. remove hydrogen.
B. deoxidise the metal.
C. improve fluidity.
D. reduce shrinkage.

Answer: Option A

Explanation:

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14. 

Which of the following is not a suitable solid lubricant ?

A. Talc
B. Molybdenum disulphide
C. Graphite
D. None of these

Answer: Option D

Explanation:

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15. 

On an average __________ fast neutrons are produced by nuclear fission of each atom of uranium-235.

A. 1
B. 2.5
C. 3.5
D. 5

Answer: Option B

Explanation:

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