Heat Transfer MCQ Questions & Answers

1

If the thermal conductivity of a wall material is independent of temperature, the steady state temperature distribution in the very large thin plane wall having steady, uniform surface tempeature follows __________ law.

A) Parabolic B) Hyperbolic C) Linear D) Logarithmic

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Answer & Solution

Answer: Option A

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2

In a single effect evaporator, the economy is

A) 1 B) < 1 C) > 1 D) None of these

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Answer & Solution

Answer: Option B

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3

Fruit juice (a heat sensitive material) can be concentrated in a __________ evaporator.

A) Long tube B) Falling film C) High pressure D) None of these

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Answer & Solution

Answer: Option B

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4

Film condensation is promoted on a/an __________ surface.

A) Oily B) Coated C) Clean & smooth D) Dirty

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Answer & Solution

Answer: Option C

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5

Dropwise condensation is promoted on a/an __________ surface.

A) Glazed B) Oily C) Coated D) Smooth

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Answer & Solution

Answer: Option B

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6

In a backward feed multiple effect evaporator

A) Feed is introduced in the first effect B) Feed flows from low pressure to high pressure C) No pumps are required between successive effects D) None of these

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Answer & Solution

Answer: Option B

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7

Which type of heat exchanger is preferred for heavy heat loads?

A) Double pipe B) Plate fine C) Series and parallel set of shell and tube D) None of these

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Answer & Solution

Answer: Option C

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8

A steel sphere of radius 0.1 m at 400°K is immersed in an oil at 300°K. If the centre of the sphere reaches 350°K in 20 minutes, how long will it take for a 0.05 m radius steel sphere to reach the same temperature (at the centre) under identical conditions ? Assume that the conductive heat transfer co-efficient is infinitely large.

A) 5 minutes B) 10 minutes C) 20 minutes D) 40 minutes

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Answer & Solution

Answer: Option A

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9

Boiling point elevation of an ideal solution

A) Increases rapidly with temperature rise B) Decreases rapidly with temperature rise C) In independent of pressure D) Both B and C

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Answer & Solution

Answer: Option A

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10

The ratio of velocity head to tube side return loss in case of a multipass shell and tube heat exchanger is

A) 2 B) $$\frac{1}{2}$$ C) 4 D) $$\frac{1}{4}$$

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Answer & Solution

Answer: Option D

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Heat Transfer MCQ Questions & Answers | Chemical Engineering