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Heat and Mass Transfer

Heat and Mass Transfer
The amount of radiation mainly depends on

Temperature of body
All of these
Nature of body
Type of surface of body

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Heat and Mass Transfer
A designer chooses the values of fluid flow rates and specific heats in such a manner that the heat capacities of the two fluids are equal. A hot fluid enters the counter flow heat exchanger at 100°C and leaves at 60°C. A cold fluid enters the heat exchanger at 40°C. The mean temperature difference between the two fluids is

60°C
66.7°C
40°C
20°C

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Heat and Mass Transfer
According to Kirchoff's law, the ratio of emissive power to absorptivity for all bodies is equal to the emissive power of a

Brilliant white polished body
Red hot body
Black body
Grey body

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Heat and Mass Transfer
The total radiation from a black body per second per unit area is ________ fourth power of the absolute temperature. This statement is known as Stefan Boltzmann law.

Equal to
Directly proportional to
None of these
Inversely proportional to

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Heat and Mass Transfer
Heat transfer by radiation mainly depends upon

All of these
Nature of the body
Its temperature
Kind and extent of its surface

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Heat and Mass Transfer
The heat transfer takes place according to

Second law of thermodynamics
Kirchhoff's law
Zeroth law of thermodynamics
First law of thermodynamics

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MORE MCQ ON Heat and Mass Transfer

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