Chemical Engineering - Mechanical Operations

31. 

Which of the following mineral dressing operations is termed as 'comminution'?

A. Panning
B. Spiralling
C. Tabling
D. None of these

Answer: Option D

Explanation:

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32. 

The capacity of a pneumatic conveying system depends upon the

A. bulk density of materials.
B. pressure of the conveying air.
C. diameter of the conveying line.
D. all (a), (b) and (c).

Answer: Option D

Explanation:

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33. 

Pick out the wrong statement.

A. Close circuit grinding is more economical than open circuit grinding.
B. Cod oil, beef tallow or aluminium stearates are used as grinding aids in cement 'industries'.
C. The equipment used for the removal of traces of solids from a liquid is called a classifier.
D. Size enlargement is a mechanical operation exemplified by medicinal tablet making.

Answer: Option C

Explanation:

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34. 

Gravity settling process is not involved in the working of a

A. hydrocyclone
B. classifier
C. dorr-thickener
D. sedimentation tank

Answer: Option A

Explanation:

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35. 

Froth floatation is the most suitable for treating

A. iron ores
B. sulphide ores
C. quartzite
D. none of these

Answer: Option B

Explanation:

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