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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
Depends upon the shape of body
Lower
Same

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Heat and Mass Transfer
Absorptivity of a body will be equal to its emissivity

At all temperatures
When system is under thermal equilibrium
At critical temperature
At one particular temperature

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Heat and Mass Transfer
In counter current flow heat exchanger, the logarithmic temperature difference between the fluids is ________ as compared to parallel flow heat exchanger.

Less
Greater
Same
None of these

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Heat and Mass Transfer
According to Stefan Boltzmann law, ideal radiators emit radiant energy at a rate proportional to

Square of temperature
Fourth power of absolute temperature
Fourth power of temperature
Absolute temperature

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Heat and Mass Transfer
If the energy radiated per second per sq. cm. of the surface for wave lengths lying between λ, and λ + dλ is represented by (eλ.dλ), then eλ is called

Absorptive power
Emissivity
Emissive power
None of these

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Heat and Mass Transfer
All radiations in a black body are

Absorbed
Reflected
Refracted
Transmitted

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