Q. Evaporation of 1kg of water from a solution in a single effect evaporator requires about __________ kg of steam.
✅ Correct Answer: (B)
1 - 1.3
Heat Transfer MCQs | Page - 4
Dear candidates you will find MCQ questions of Heat Transfer here. Learn these questions and prepare yourself for coming examinations and interviews. You can check the right answer of any question by clicking on any option or by clicking view answer button.
Q. Stefan-Boltzman law which describes the radiation heat transfer states that, it is proportional to (where, t = temperature in °C T = absolute temperature in °K)
✅ Correct Answer: (B)
T4
Q. A single pass air heater is connected to a two pass unit. For the air flow rate and other conditions remaining the same, the film heat transfer co-efficient for air will vary in the ratio of
✅ Correct Answer: (B)
20.8
Q. The film co-efficient between condensing vapour and metal wall increases with
✅ Correct Answer: (A)
Increasing temperature of the vapour
Q. If all the conditions and dimensions are same, then the ratio of velocity through the tubes of a double pass heat exchanger to that through the single pass heat exchanger is
✅ Correct Answer: (C)
2
Q. Temperature profile in steady state heat transfer is
✅ Correct Answer: (D)
Linear
Q. The inner wall of a furnace is at a temperature of 700°C. The composite wall is made of two substances, 10 and 20 cm thick with thermal conductivities of 0.05 and 0.1 W.m-1.°C-1 respectively. The ambient air is at 30°C and the heat transfer co-efficient between the outer surface of wall and air is 20 W.m-2.°C-1. The rate of heat loss from the outer surface in W.m-2 is
✅ Correct Answer: (A)
165.4
Q. In case of a multipass shell and tube heat exchanger, the temperature drop in the fluid
✅ Correct Answer: (B)
And the wall are proportional to individual resistances
Q. Three material A, B and C of equal thick-nes and of thermal conductivity of 20, 40 & 60 kcal/hr. m. °C respectively are joined together. The temperature outside of A and C are 30°C and 100°C respectively. The interface between B and C will be at a temperature of __________ °C.
✅ Correct Answer: (C)
70
Q. The main function of baffles provided in a shell and tube heat exchanger is to
✅ Correct Answer: (B)
Enhance turbulence
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