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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

Higher
Lower
Same
Depends upon the shape of body

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Heat and Mass Transfer
The transfer of heat by molecular collision is smallest in

None of these
Liquids
Solids
Gases

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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

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

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Heat and Mass Transfer
The use of heat exchangers is made in

Radiators in automobile
All of these
Condensers and boilers in steam plants
Condensers and evaporators in refrigeration and air conditioning units

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

Thermal diffusivity
Thermal conductivity
Density
Dynamic viscosity

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Heat and Mass Transfer
The amount of heat flow through a body by conduction is

Dependent upon the material of the body
Directly proportional to the surface area of the body
All of these
Directly proportional to the temperature difference on the two faces of the body

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