Heat Transfer MCQ Questions & Answers

1

Minimum recommended baffle spacing in a shell and tube heat exchanger is about (where, D = shell diameter)

A) 0.2 D B) 0.5 D C) 0.66 D D) 0.80 D

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Answer & Solution

Answer: Option A

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2

LMTD can't be used as such without a correction factor for the

A) Multipass heat exchanger B) Baffled heat exchanger C) Condensation of mixed vapour in a condenser D) All of the above

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Answer & Solution

Answer: Option D

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3

Economy of an evaporator is influenced by the

A) Steam pressure B) Feed temperature C) Number of effect D) Both B & C

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Answer & Solution

Answer: Option D

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4

In regenerative air preheater (as practised in heating of coke ovens), the heat is transferred

A) Through a metallic wall B) By direct contact of hot flue gas with air C) By heating an intermediate material (like chequor bricks) and then heating the air from this hot material D) None of these

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Answer & Solution

Answer: Option C

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5

The advantage of backward feed multiple effect evaporators over forward feed units is that

A) Heat sensitive material can be handled B) There is no additional cost of pumping C) Most concentrated liquid is at highest temperature D) Equal heat transfer co-efficients exist in various effects

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Answer & Solution

Answer: Option C

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6

The ratio of momentum diffusivity to thermal diffusivity is the __________ number.

A) Prandtl B) Nusselt C) Stanton D) Grashoff

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Answer & Solution

Answer: Option A

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7

The Nusselt number for fully developed (both thermally and hydrodynamically) laminar flow through a circular pipe, where the wall heat flux is constant, is

A) 2.36 B) 4.36 C) 120.36 D) Dependent on N_Re only

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Answer & Solution

Answer: Option B

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8

Water always boils when its

A) Temperature reaches 100° C B) Vapour pressure equals 76 cm of Hg C) Saturated vapour pressure equals the external pressure on its surface D) Saturated vapour pressure is less than the atmospheric pressure

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Answer & Solution

Answer: Option C

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9

Which one gives the monochromatic emissive power for black body radiation?

A) Planck's law B) Kirchhoffs law C) Wien's law D) Stefan-Boltzman law

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Answer & Solution

Answer: Option A

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10

If heat transfer rate varies with the time, it is termed as

A) Forced convection B) Steady state conduction C) Monochromatic radiation D) None of these

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Answer & Solution

Answer: Option D

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Heat Transfer MCQ Questions & Answers | Chemical Engineering