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Heat and Mass Transfer

Heat and Mass Transfer
The ratio of the energy absorbed by the body to total energy falling on it is called

Emissivity
Emissive power
Absorptivity
Absorptive power

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Heat and Mass Transfer
The emissive power of a body depends upon its

Physical nature
Temperature
All of these
Wave length

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Heat and Mass Transfer
The automobile radiator is a heat exchanger of

Regenerator type
Counter flow type
Cross flow type
Parallel flow type

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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
Heat is transferred by all three modes of transfer, viz. conduction, convection and radiation in

Refrigerator condenser coils
Boiler
Electric heater
Steam condenser

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Heat and Mass Transfer
Two balls of same material and finish have their diameters in the ratio of 2: 1 and both are heated to same temperature and allowed to cool by radiation. Rate of cooling by big ball as compared to smaller one will be in the ratio of

0.16736111111111
0.043055555555556
0.084027777777778
0.042361111111111

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