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Heat Transfer MCQ Questions & Answers | Chemical Engineering

Learn Heat Transfer MCQ questions & answers are available for a Chemical Engineering students to clear GATE exams, various technical interview, competitive examination, and another entrance exam. Heat Transfer MCQ question is the important chapter for a Chemical Engineering and GATE students. Page-4 section-3

Each section contains 100 MCQs on Heat Transfer .
31
The actual temperature drop across the heating surface of an evaporator depends on the
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Answer: Option D
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32
In Biot number, the characteristic length used is the ratio of the __________ of the solid.
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Answer: Option A
Solution:
The Biot number (Bi) is a dimensionless quantity used in heat transfer.

It represents the ratio of the internal thermal resistance within a solid to the external thermal resistance between the solid and its surrounding fluid.

In the Biot number calculation, the characteristic length is defined as the ratio of the volume of the solid to its surface area.

This characteristic length helps determine whether temperature gradients within the solid are significant compared to those at the surface.
33
Steam consumption in kg/hr in case of an evaporator is given by (where, C & E are capacity the economy of the evaporator respectively)
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Answer: Option A
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34
Steam condensate is recovered by steam traps and recycled for use as boiler feed water, because of its low
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Answer: Option D
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35
All analogy equations connecting friction factor and heat transfer co-efficient apply only to
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Answer: Option A
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36
The unit of heat transfer co-efficient in SI unit is
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Answer: Option B
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37
The main purpose of providing fins on heat transfer surface is to increase the
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Answer: Option C
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38
Hot water (0.01 m3/min) enters the tube side of a counter current shell and tube heat exchanger at 80°C and leaves at 50°C. Cold oil (0.05 m3/min) of density 800 kg/m3 and specific heat of 2 kJ/kg.K enters at 20°C. The log mean temperature difference in °C is approximately
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Answer: Option A
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39
The rate of heat transfer is a product of overall heat transfer co-efficient, the difference in temperature and the
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Answer: Option B
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40
Multiple effect evaporation accounts for
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Answer: Option A
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