Heat Transfer MCQs | Heat Transfer Multiple Choice Questions with Answers

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Questions
61 Total emissivity of polished silver compared to black body is
A Same
B Higher
C More Or Less Same
D Very Much Lower

Answer: Very Much Lower
62 Stefan Boltzmann law is applicable for heat transfer by
A conduction
B convection
C radiation
D conduction and radiation combined

Answer: radiation
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63 The thermal diffusivities for solids are generally
A less than those for gases
B jess than those for liquids
C more than those for liquids and gases
D more or less same as for liquids and gases

Answer: more than those for liquids and gases
64 According to Stefan’s law, the total radiation from a black body per second per unit area is proportional to
A absolute temperature
B T2
C T5
D t

Answer: t
65 The total emissivity power is .defined as the total amount of radiation emitted by a black body per unit
A Temperature
B Thickness
C Area
D Time

Answer: Time
66 The ratio of the energy absorbed by the body to total energy falling on it is called
A Absorptive Power
B Emissive Power
C Absorptivity
D Emissivity

Answer: Absorptive Power
67 The amount of radiation mainly depends on
A nature of body
B temperature of body
C type of surface of body
D All Of The Above

Answer: All Of The Above
68 The emissive power of a body depends upon its
A Temperature
B Wave Length
C Physical Nature
D All Of The Above

Answer: All Of The Above
69 In regenerator type heat exchanger, heat transfer takes place by
A direct mixing of hot and cold fluids
B a complete separation between hot and cold fluids
C flow of hot and cold fluids alternately over a surface
D generation of heat again and again

Answer: flow of hot and cold fluids alternately over a surface
70 If the temperature of a solid surface changes form 27°C to 627°C, then its emissive power changes in the ratio of
A 3
B 6
C 9
D 81

Answer: 81

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