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Heat and Mass Transfer

Heat and Mass Transfer
Emissivity of a white polished body in comparison to a black body is

Same
Lower
Depends upon the shape of body
Higher

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Heat and Mass Transfer
Which of the following property of air does not increase with rise in temperature?

Thermal conductivity
Thermal diffusivity
Dynamic viscosity
Density

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Heat and Mass Transfer
In regenerator type heat exchanger, heat transfer takes place by

A complete separation between hot and cold fluids
Generation of heat again and again
Flow of hot and cold fluids alternately over a surface
Direct mixing of hot and cold fluids

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Heat and Mass Transfer
Total emissivity of polished silver compared to black body is

Very much lower
Higher
More or less same
Same

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Heat and Mass Transfer
The value of Prandtl number for air is about

1.7
0.1
0.3
0.7

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Heat and Mass Transfer
The ratio of the emissive power and absorptive power of all bodies is the same and is equal to the emissive power of a perfectly black body. This statement is known as

Stefan's law
Kirchhoff's law
Wien's law
Planck's law

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