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Heat and Mass Transfer

Heat and Mass Transfer
The total emissivity power is .defined as the total amount of radiation emitted by a black body per unit

Thickness
Time
Area
Temperature

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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

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

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Heat and Mass Transfer
The transfer of heat by molecular collision is known as

None of these
Radiation
Convection
Conduction

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Heat and Mass Transfer
The process of heat transfer from one particle of the fluid to another by the actual movement of the fluid particles caused by some mechanical means, is known as

Radiation
Conduction
Free convection
Forced convection

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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
40°C
20°C
66.7°C

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Heat and Mass Transfer
The heat is transferred by conduction, convection and radiation in

Boiler furnaces
Condensation of steam in condenser
None of these
Melting of ice

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