Heat Transfer MCQ Questions & Answers

1

Pick out the wrong statement.

A) In drying a solid containing moisture above the critical moisture content the number of degrees of freedom is 2 B) Sherwood number in mass transfer corresponds to Nusselt number in heat transfer and Schmidt number to Prandtl number C) Forced convection is relatively more effective in increasing the rate of mass transfer, if Schmidt number is larger D) Hot gases at moderate pressure are usually in the shell side of shell and tube heat exchangers. At higher pressure, however, it is customary to put gas in the tube side

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Answer & Solution

Answer: Option C

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2

Multipass heat exchangers are used

A) Because of simplicity of fabrication B) For low heat load C) To obtain higher heat transfer co-efficient and shorter tube D) To reduce the pressure drop

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Answer & Solution

Answer: Option C

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3

Steam economy in case of a triple effect evaporator will be

A) 1 B) < 1 C) > 1 D) Between 0 and 1

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Answer & Solution

Answer: Option C

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4

Kirchoff's law is applicable to

A) Monochromatic radiation only B) Total radiation only C) Both A and B D) Only volumes and not to surfaces

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Answer & Solution

Answer: Option C

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5

The local surface conductance for laminar film condensation on vertical surface is (where, t = film thickness)

A) ∝ t B) ∝ $$\frac{1}{{\text{t}}}$$ C) ∝ $$\sqrt {\text{t}} $$ D) Independent of 't'

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Answer & Solution

Answer: Option B

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6

The Grashoff number is defined as the ratio of the

A) Buoyancy to inertial forces B) Buoyancy to viscous forces C) Inertial to viscous forces D) Buoyancy to surface tension forces

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Answer & Solution

Answer: Option B

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7

A __________ surface has the maximum thermal emissivity out of the following.

A) Black & smooth B) Black & rough C) White & smooth D) White & rough

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Answer & Solution

Answer: Option B

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8

Which of the following has maximum thermal conductivity at the same temperature?

A) Steel B) Petrol C) Air D) All of the above

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Answer & Solution

Answer: Option A

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9

As per Kirchoffs law, the ratio of the total radiating power to the absorptivity of a body depends on the

A) Temperature of the body only B) Wavelength of monochromatic radiation C) Both A and B D) Nature of material of body

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Answer & Solution

Answer: Option A

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10

With increase in temperature, the thermal conductivity of fresh lubricating oil

A) Increases B) Decreases C) Remains unchanged D) May increase or decrease; depends on its composition

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Answer & Solution

Answer: Option B

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Heat Transfer MCQ Questions & Answers | Chemical Engineering