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Heat Transfer MCQs: 986 Questions & Answers in Engineering

986 Heat Transfer MCQs in Engineering with answers & explanations. Page 32. Practice objective questions for competitive exams, interviews & self-assessment… Use the answer toggle below to show or hide all solutions, tap an option to check one question, or open a question for its own page.

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Heat Transfer MCQs: 986 Questions & Answers in Engineering

Convective heat transfer, in which heat is transferred by movement of warmed matter is described by

For a cold dilute feed to produce thick viscous liquor, backward feeding as compared to forward feeding results in

Which of the following has the minimum absorptivity?

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

In a forward feed multiple effect, the pressure build up will be

Graetz number is given by

Thermal diffusivity is given by

The rate of heat transfer is a product of overall heat transfer co-efficient, the difference in temperature and the

Reynold's analogy states that

Which of the following has the minimum thermal conductivity?

In case of a vertical tube evaporator, with increase in the liquor level, the

Low thermal conductivity of heat insulating materials is due to its

For an ideal black body

In a liquid-liquid heat exchanger, for the same process temperature, the ratio of the LMTD in parallel flow to the LMTD in counter flow is always

For concentrating an aqueous solution of a material like anhydrous Na2SO4, whose solubility decreases with rise in temperature, the most suitable evaporator is a __________ evaporator.

Small scale evaporation is done in a

Heat waves

Leidenfrost point is a term concerned with the

Out of 100 kcal/second of incident radiant energy on the surface of a thermally transparent body, 300 kcal/second is reflected back. If the transmissivity of the body is 0.25, the emissivity of the surface will be

If air (a non-condensing gas) is present in a condensing vapor stream, it will __________ the condensation rate of vapor.

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