Learn Heat Transfer MCQ Questions with answers and solutions.

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Q. When vaporisation takes place through a blanketting film of gas, the phenomenon is termed as __________ boiling.

(A) Pool
(B) Nucleate
(C) Transition
(D) Film

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Q. Resistance to heat flow by conduction is proportional to (where, t & ρ are thickness & density of the material respectively and A = area normal to the direction of heat flow.)

(A) t
(B) 1/ρ
(C) 1/A
(D) All of the above

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Q. For the same heat transfer area and the terminal conditions, the ratio of the capacities of a single effect evaporator to a triple effect evaporator is

(A) 0.33
(B) 1
(C) 1.33
(D) 3

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Q. Evaporation of 1kg of water from a solution in a single effect evaporator requires about __________ kg of steam.

(A) 0.4 - 0.6
(B) 1 - 1.3
(C) 1.8 - 2
(D) 2 - 2.4

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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)

(A) t⁴
(B) T⁴
(C) 1/t⁴
(D) 1/T⁴

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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

(A) 2
(B) 2^0.8
(C) 2^0.2
(D) 2^0.5

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Q. The film co-efficient between condensing vapour and metal wall increases with

(A) Increasing temperature of the vapour
(B) Increasing viscosity of the film of condensate
(C) Decreasing temperature of the vapour
(D) Increasing temperature drop

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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

(A) 1/2
(B) 1
(C) 2
(D) 4

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Q. Temperature profile in steady state heat transfer is

(A) Asymptotic
(B) Hyperbolic
(C) Parabolic
(D) Linear

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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

(A) 165.4
(B) 167.5
(C) 172.5
(D) 175

Heat Transfer MCQs with answers Page - 3

Q. When vaporisation takes place through a blanketting film of gas, the phenomenon is termed as __________ boiling.

Q. Resistance to heat flow by conduction is proportional to (where, t & ρ are thickness & density of the material respectively and A = area normal to the direction of heat flow.)

Q. For the same heat transfer area and the terminal conditions, the ratio of the capacities of a single effect evaporator to a triple effect evaporator is

Q. Evaporation of 1kg of water from a solution in a single effect evaporator requires about __________ kg of steam.

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)

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

Q. The film co-efficient between condensing vapour and metal wall increases with

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

Q. Temperature profile in steady state heat transfer is

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