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Chemical Engineering - Heat Transfer

Exercise : Heat Transfer - Section 4
41.
Film boiling occurs at __________ pressure.
atmospheric
sub-atmospheric
negative
very high
Answer: Option
Explanation:
No answer description is available. Let's discuss.
42.
Heat flux through several resistances in series in analogous to the current flowing through several
resistances in parallel.
capacitors in series.
resistances in series.
none of these.
Answer: Option
Explanation:
No answer description is available. Let's discuss.
43.
Extended heat transfer surface like fins are used to increase the heat transfer rate. Fin efficiency is defined as the ratio of heat transferred across the fin surface to the theoretical heat transfer across an equal area held at the
surrounding temperature.
average temperature of the fin.
temperature of the fin end.
constant temperature equal to that of the base
Answer: Option
Explanation:
No answer description is available. Let's discuss.
44.
Vacuum is generally maintained in the vapour space of an evaporator mainly to
get economical temperature difference by using moderate pressure steam.
facilitate forward feeding in multiple effect evaporation.
concentrate heat sensitive materials.
achieve very high concentration of the final product.
Answer: Option
Explanation:
No answer description is available. Let's discuss.
45.
Double pipe heat exchangers are used
when heat transfer area required is very high.
when heat transfer area required is very low, i.e (100-200 ft2).
because it occupies less floor area.
because it is less costly.
Answer: Option
Explanation:
No answer description is available. Let's discuss.
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