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Heat and Mass Transfer

Heat and Mass Transfer
All radiations in a black body are

Refracted
Transmitted
Reflected
Absorbed

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Heat and Mass Transfer
Thermal conductivity of air with rise in temperature

Decreases
Increases
May increase or decrease depending on temperature
Remain constant

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Heat and Mass Transfer
According to Stefan's law, the total radiation from a black body per second per unit area is proportional to

T5
Absolute temperature
T
T2

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Heat and Mass Transfer
Heat is closely related with

Liquids
Temperature
Energy
Entropy

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Heat and Mass Transfer
The ratio of the emissive power and absorptive power of all bodies is the same and is equal to the emissive power of a perfectly black body. This statement is known as

Wien's law
Planck's law
Stefan's law
Kirchhoff's law

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Heat and Mass Transfer
In heat exchangers, degree of approach is defined as the difference between temperatures of

Hot medium outlet and cold water inlet
Hot medium outlet and cold water outlet
Cold water inlet and outlet
Hot medium inlet and outlet

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MORE MCQ ON Heat and Mass Transfer

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