Chemical Engineering - Chemical Engineering Basics

41. 

A good abrasive

A. should be friable.
B. should have low refractoriness.
C. is made up of large size of crystals.
D. should be soft.

Answer: Option A

Explanation:

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42. 

Out of the following, __________ pipe is the least corrosion resistant.

A. mild steel
B. copper
C. wrought iron
D. stainless steel

Answer: Option C

Explanation:

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43. 

In order to protect the aquatic creatures, the dissolved oxygen content in fresh water stream should never be less than __________ PPm.

A. 0.5
B. 1
C. 5
D. 20

Answer: Option C

Explanation:

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44. 

For which pair of the fuel gases, calorific value (C.V.) of one fuel is almost double that of the other on volume basis (i.e., kcal/Nm3) while the C.V. is same on weight basis (i.e., kcal/kg) ?

A. Propane and acetylene
B. Propane and LPG
C. Sewage gas and gobar gas
D. B.F gas and coke oven gas

Answer: Option D

Explanation:

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45. 

Sheardising process is used for

A. surface coating.
B. heat treatment of high speed steel.
C. cold working on metals.
D. none of these.

Answer: Option A

Explanation:

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