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Heat and Mass Transfer

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

Physical nature
All of these
Temperature
Wave length

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

0.7
0.1
1.7
0.3

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Heat and Mass Transfer
Fourier's law of heat conduction is valid for

Three dimensional cases only
Regular surfaces having non-uniform temperature gradients
Two dimensional cases only
One dimensional cases only

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

Counter flow type
Parallel flow type
Cross flow type
Regenerator type

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Heat and Mass Transfer
Thermal conductivity of water _________ with rise in temperature.

Increases
Decreases
May increase or decrease depending upon temperature
Remain same

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Heat and Mass Transfer
The ratio of surface convection resistance to the internal conduction resistance is known as

Stanton number
Biot number
Grashoff number
Prandtl number

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