Heat Transfer MCQ Questions & Answers

91

The purpose of providing bleed points in the evaporator is to

A) Admit the feed B) Remove the product C) Facilitate removal of non-condensable gases D) Create vacuum

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Answer & Solution

Answer: Option C

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92

Which of the following is unimportant in forced convection?

A) Reynolds number B) Prandtl number C) Grashhoff number D) None of these

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Answer & Solution

Answer: Option C

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93

Duhring rule is important in solving problems on

A) Distillation B) Crystallisation C) Evaporation D) Humidification

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Answer & Solution

Answer: Option C

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94

Fourier's law of heat conduction applies to __________ surfaces.

A) Isothermal B) Non-isothermal C) Both A and B D) Neither A and B

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Answer & Solution

Answer: Option C

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95

Fourier's law applies to the heat transfer by

A) Convection B) Radiation C) Conduction D) All of the above

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Answer & Solution

Answer: Option C

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96

Prandtl number is the ratio of

A) Momentum diffusivity to mass diffusivity B) Momentum diffusivity to thermal diffusivity C) Thermal diffusivity to mass diffusivity D) Thermal diffusivity to momentum diffusivity

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Answer & Solution

Answer: Option B

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97

Pick out the wrong statement.

A) Bubble size increases with the dynamic viscosity of the liquid in case of nucleate pool boiling B) Thermal conductivity of a dry material is more than that of the damp material C) Ratio of its capacity to economy equals the steam consumption in kg/hr in an evaporator D) Vaporisation of organic substances in evaporator mostly causes foam formation

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Answer & Solution

Answer: Option B

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98

Water is normally used as a coolant in the heat exchange equipments mainly because ofits

A) Abundance & high heat capacity B) Low density C) Low viscosity D) High fluidity

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Answer & Solution

Answer: Option A

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99

The overall heat transfer co-efficient for a shell and tube heat exchanger for clean surfaces is U₀ = 400 W/m².K. The fouling factor after one year of operation is found to be h_d0 = 2000 W/m².K. The overall heat transfer co-efficient at this time is

A) 1200 W/m².K B) 894 W/m².K C) 333 W/m².K D) 287 W/m².K

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Answer & Solution

Answer: Option C

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100

Forced circulation evaporators are normally used for concentrating liquids having

A) Scaling characteristics B) High viscosity C) Both A & B D) Neither A nor B

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Answer & Solution

Answer: Option C

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Heat Transfer MCQ Questions & Answers | Chemical Engineering