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Chemical Engineering - Heat Transfer

Exercise : Heat Transfer - Section 10
21.
In a gas-liquid shell and tube heat exchanger, the
presence of a non-condensible gas decreases the condensing film co-efficient.
gases under high pressure are routed through the tube side, because high pressure gases are corrosive in nature.
gases to be heated/cooled is normally routed through the shell side, because the corrosion caused by the cooling water or steam condensate remain localised to the tubes.
all 'a', 'b' & 'c'
Answer: Option
Explanation:
No answer description is available. Let's discuss.
22.
Which is the most suitable for the concentration of foamy & frothy liquors ?
Agitated film evaporator
Long tube vertical evaporator
Open pan evaporator
None of these
Answer: Option
Explanation:
No answer description is available. Let's discuss.
23.
Boiling point elevation of an ideal solution
increases rapidly with temperature rise.
decreases rapidly with temperature rise
in independent of pressure.
both (b) and (c).
Answer: Option
Explanation:
No answer description is available. Let's discuss.
24.
The rate of heat transfer is a product of overall heat transfer co-efficient, the difference in temperature and the
heating volume
heat transfer area
Nusselt number
none of these
Answer: Option
Explanation:
No answer description is available. Let's discuss.
25.
Which of the following has the lowest overall heat transfer co-efficient ?
Dowtherm
Molten sodium
Water
Air
Answer: Option
Explanation:
No answer description is available. Let's discuss.
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