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Chemical Engineering - Heat Transfer

Exercise : Heat Transfer - Section 9
46.
__________ heat exchanger is used for chilling oil to be dewaxed.
U-tube
Double pipe
Fixed tube
Floating head
Answer: Option
Explanation:
No answer description is available. Let's discuss.
47.
It is not recommended to use a 1-2 shell and tube heat exchanger for a particular heat duty, whenever the LMTD correction factor is
> 0.75
< 0.75
< 0.50
< 0.25
Answer: Option
Explanation:
No answer description is available. Let's discuss.
48.
Pick out the wrong statement.
Economy of a multiple effect evaporator is not influenced by the boiling point elevation.
Two identical cubes of iron and copper will have the same heat content under the same conditions of temperature.
Double pipe heat exchangers are mostly used in the field of refrigeration.
Finned tube heat exchangers are suitable for heating air by steam.
Answer: Option
Explanation:
No answer description is available. Let's discuss.
49.
In sub-cooled boiling,
temperature of the heating surface is less than the boiling point of the liquid.
temperature of the heating surface is more than the boiling point of the liquid.
bubbles from heating surface are absorbed by the mass of the liquid.
very large vapour space is necessary.
Answer: Option
Explanation:
No answer description is available. Let's discuss.
50.
With increase in temperature, the thermal conductivity of a gas
increases.
decreases.
remains same.
may increase or decrease depending on the type of gas.
Answer: Option
Explanation:
No answer description is available. Let's discuss.
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