Heat Transfer MCQ Questions & Answers

31

The unit of heat transfer co-efficient is

A) BTU/hr.ft²°F B) BTU/hr.°F.ft C) BTU/hr.°F D) BTU/hr.ft

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Answer & Solution

Answer: Option A

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32

If average heat transfer co-efficient is $${{\text{h}}_{\text{a}}}$$ and the local coefficient at the end of the plate is $${{\text{h}}_l}$$ then in case of heat transfer to a fluid flowing over a flat plate, heated over its entire length

A) $${{\text{h}}_{\text{a}}} = {{\text{h}}_l}$$ B) $${{\text{h}}_{\text{a}}} = 2{{\text{h}}_l}$$ C) $${{\text{h}}_{\text{a}}} = 0.5{{\text{h}}_l}$$ D) $${{\text{h}}_{\text{a}}} = 0.75{{\text{h}}_l}$$

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Answer & Solution

Answer: Option B

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33

At Pr > 1, conduction in an ordinary fluid flowing through a heated pipe is limited to the

A) Buffer zone B) Turbulent core C) Both A and B D) Viscous sub-layer

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Answer & Solution

Answer: Option D

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34

When vaporisation takes place directly at the heating surface, it is called

A) Film boiling B) Nucleate boiling C) Vapour binding D) None of these

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Answer & Solution

Answer: Option B

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35

Which is the most suitable for the con-certration of highly concentrated solution?

A) Open pan evaporation B) Long tube vertical evaporator C) Agitated film evaporator D) None of these

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Answer & Solution

Answer: Option A

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36

View factor is important in heat transfer by

A) Steady state conduction B) Natural convection C) Forced convection D) Radiation

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Answer & Solution

Answer: Option D

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37

Thermal diffusivity is the most important in heat transfer by

A) Conduction B) Radiation C) Condensation D) Natural convection

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Answer & Solution

Answer: Option A

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38

Tube expansion allowances exist in __________ heat exchanger.

A) Multipass fixed tube sheet B) U-tube C) Single pass fixed tube sheet D) None of these

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Answer & Solution

Answer: Option B

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39

In case of a shell and tube heat exchanger, the minimum and maximum baffle spacing is respectively (where, D = inside diameter of the shell)

A) $$\frac{{\text{D}}}{5}$$ and D B) $$\frac{{\text{D}}}{2}$$ and 2D C) $$\frac{{\text{D}}}{4}$$ and 2D D) D and 2D

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Answer & Solution

Answer: Option A

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40

Mode of heat transfer involved in the cooling of air cooled internal combustion engine is

A) Conduction B) Natural convection C) Forced convection D) None of these

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Answer & Solution

Answer: Option B

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Heat Transfer MCQ Questions & Answers | Chemical Engineering