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Heat and Mass Transfer

Heat and Mass Transfer
In heat transfer, conductance equals conductivity (kcal/hr/sq.m/°C/cm) divided by

°C (temperature)
Hr (time)
Sq. m (area)
K.cal (heat)

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

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

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Heat and Mass Transfer
Radiation is the process of heat transfer in which heat flows from a ________, in a straight line, without affecting the intervening medium.

Larger body to smaller body
Hot body to cold body
Cold body to hot body
Smaller body to larger body

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Heat and Mass Transfer
The critical temperature is the temperature

Above which a gas will never liquefied
Below which a gas does not obey gas laws
Below which a gas is always liquefied
Above which a gas may explode

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

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

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Heat and Mass Transfer
The heat of sun reaches to us according to

None of these
Convection
Conduction
Radiation

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