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Chemical Engineering - Heat Transfer

Exercise : Heat Transfer - Section 1
36.
The unit of heat transfer co-efficient in SI unit is
J/M2°K
W/m2°K
W/m°K
J/m°K
Answer: Option
Explanation:
No answer description is available. Let's discuss.
37.
The number of kg vaporised per kg of steam fed to the evaporator is defined as
capacity
rate of evaporation
economy
rate of vaporisation
Answer: Option
Explanation:
No answer description is available. Let's discuss.
38.
Pick out the wrong statement.
In case of heat transfer by purely forced convection, GR/Re2 ≤ 1.
The equivalent diameter of heat transfer for a duct of square cross-section (having each side as 'x') is equal to 4x.
Distillation process is not the same as evaporation.
The effectiveness of nucleate boiling depends basically on the ease with which the bubbles are formed and detached from the heating surface.
Answer: Option
Explanation:
No answer description is available. Let's discuss.
39.
Economy of a multiple effect evaporator is not influenced much by the
boiling point elevations
temperature of the feed
rate of heat transfer
ratio of the weight of the thin liquor to thick liquor
Answer: Option
Explanation:
No answer description is available. Let's discuss.
40.
Increasing the liquor level in the evaporator results in the
decreased capacity.
increase in liquor film co-efficient.
decreased effect of hydrostatic head.
increased true temperature drop.
Answer: Option
Explanation:
No answer description is available. Let's discuss.
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