Chemical Engineering - Heat Transfer

36. 

The unit of heat transfer co-efficient in SI unit is

A. J/M2°K
B. W/m2°K
C. W/m°K
D. J/m°K

Answer: Option B

Explanation:

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37. 

The number of kg vaporised per kg of steam fed to the evaporator is defined as

A. capacity
B. rate of evaporation
C. economy
D. rate of vaporisation

Answer: Option C

Explanation:

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38. 

Pick out the wrong statement.

A. In case of heat transfer by purely forced convection, GR/Re2 ≤ 1.
B. The equivalent diameter of heat transfer for a duct of square cross-section (having each side as 'x') is equal to 4x.
C. Distillation process is not the same as evaporation.
D. The effectiveness of nucleate boiling depends basically on the ease with which the bubbles are formed and detached from the heating surface.

Answer: Option B

Explanation:

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39. 

Economy of a multiple effect evaporator is not influenced much by the

A. boiling point elevations
B. temperature of the feed
C. rate of heat transfer
D. ratio of the weight of the thin liquor to thick liquor

Answer: Option A

Explanation:

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40. 

Increasing the liquor level in the evaporator results in the

A. decreased capacity.
B. increase in liquor film co-efficient.
C. decreased effect of hydrostatic head.
D. increased true temperature drop.

Answer: Option A

Explanation:

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