Heat Transfer MCQ Questions & Answers

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Each section contains 100 MCQs on Heat Transfer .

The critical radius of insulation for a spherical shell is (where, K = thermal conductivity of insulating material h₀ = heat transfer coefficient at the outer surface)

A) $$\frac{{\text{K}}}{{{{\text{h}}_0}}}$$ B) $$\frac{{2{\text{K}}}}{{{{\text{h}}_0}}}$$ C) $$\frac{{{{\text{h}}_0}}}{{\text{K}}}$$ D) $$\frac{{{{\text{h}}_0}}}{{2{\text{K}}}}$$

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Answer & Solution

Answer: Option B

No explanation is given for this question. Let's Discuss on Board

Finned tube heat exchangers

A) Give larger area per tube B) Use metal fins of low thermal conductivity C) Facilitate very large temperature drop through tube wall D) Are used for smaller heat load

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Answer & Solution

Answer: Option A

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For an ideal black body

A) Absorptivity = 1 B) Reflectivity = 1 C) Emissivity = 0 D) Transmissivity = 1

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Answer & Solution

Answer: Option A

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The sum of reflectivity and absorptivity for an opaque body is equal to

A) 0.5 B) 1 C) 0 D) 2

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Answer & Solution

Answer: Option B

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Which of the following is not used as a medium for high temperature heating?

A) Dowtherm B) Mercury C) Liquid metal (e.g. molten sodium) D) Fused salts (e.g., an eutectic mixture of 53% KNO₃, 40% NaNO₂ and 7% NaNO₃)

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Answer & Solution

Answer: Option B

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Prandtl number for most of dry gases is about

A) 0.001 B) 0.72 C) 70 D) 150

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Answer & Solution

Answer: Option B

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Which of the following is the most widely used heat insulating material for pipelines carrying steam?

A) Tar dolomite bricks followed by asbestos B) Fireclay refractory followed by aluminium sheet C) Cotton followed by aluminium foil D) 85% magnesia cement and glass wool

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Answer & Solution

Answer: Option D

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Forced circulation evaporators are useful for the concentration of viscous, salting and scale forming liquors. Which of the following is a forced circulation evaporator?

A) Long vertical evaporator B) Horizontal tube evaporator C) Agitated film evaporator D) Calenderia vertical tube evaporator

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Answer & Solution

Answer: Option C

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Fouling factor

A) Is a dimensionless quantity B) Does not provide a safety factor for design C) Accounts for additional resistances to heat flow D) None of these

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Answer & Solution

Answer: Option C

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In SI units, fouling factor is expressed in

A) m²°K/W B) W/m²°K C) m²°K D) m°K/W

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Answer & Solution

Answer: Option A

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Heat Transfer MCQ Questions & Answers | Chemical Engineering