Chemical Engineering - Chemical Engineering Basics

41. 

Preheating prior to welding is done for the purpose of

A. decreasing cooling rate.
B. facilitating fusion of high melting metals.
C. preventing hot cracking.
D. ensuring full penetration.

Answer: Option A

Explanation:

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42. 

Presence of sulphur in steel reduces the

A. hardness.
B. grain size.
C. tensile strength.
D. toughness & transverse ductility.

Answer: Option D

Explanation:

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43. 

Frother is added in the froth floatation cell used in ore beneficiation to stabilise the air bubbles (i.e., froth), which will hold the ore particles, but it does not affect the floatability of minerals. Which of the following is not used as a frother?

A. Cresylic acid
B. Xanthaies
C. Pine oil
D. all 'a' 'b' & 'c'

Answer: Option B

Explanation:

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44. 

Otto cycle used in spark ignition petrol engines is also known as the constant __________ cycle.

A. volume
B. pressure
C. heat
D. none of these

Answer: Option A

Explanation:

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45. 

Fire on fuel oil lines can be extinguished by

A. foam
B. steam
C. water
D. carbon dioxide

Answer: Option A

Explanation:

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