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Chemical Engineering - Heat Transfer

Exercise : Heat Transfer - Section 9
6.
A single pass air heater is connected to a two pass unit. For the air flow rate and other conditions remaining the same, the film heat transfer co-efficient for air will vary in the ratio of
2
20.8
20.2
20.5
Answer: Option
Explanation:
No answer description is available. Let's discuss.
7.
Heat sensitive materials can be concentrated in an evaporator employing
vacuum
high pressure
high residence time
none of these
Answer: Option
Explanation:
No answer description is available. Let's discuss.
8.
A concentric double pipe heat exchanger as compared to the shell and tube heat exchanger for the same heat load requires
less heating surface.
more space.
lower maintenance cost.
none of these.
Answer: Option
Explanation:
No answer description is available. Let's discuss.
9.
In a shell and tube heat exchanger, floating head is used for
large temperature differentials.
high heat transfer co-efficient.
low pressure drop.
less corrosion of tubes.
Answer: Option
Explanation:
No answer description is available. Let's discuss.
10.
Steam trap is used to
condense the steam flowing in the pipeline.
remove water resulting from partial condensation of steam.
stop the supply of steam.
none of these.
Answer: Option
Explanation:
No answer description is available. Let's discuss.
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