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Heat and Mass Transfer

Heat and Mass Transfer
The radiation emitted by a black body is known as

Black radiation
All of these
Full radiation
Total radiation

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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

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

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Heat and Mass Transfer
Stefan Boltzmann law is applicable for heat transfer by

Convection
Radiation
Conduction and radiation combined
Conduction

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Heat and Mass Transfer
The ratio of the thickness of thermal boundary layer to the thickness of hydrodynamic boundary layer is equal to (Prandtl number) n, where n is equal to

1
=-1/3
=-2/3
-1

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Heat and Mass Transfer
The unit of overall coefficient of heat transfer is

kcal/hr °C
kcal/m² hr °C
kcal/m hr °C
kcal/m²

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

Depends upon the shape of body
Higher
Same
Lower

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