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Heat and Mass Transfer

Heat and Mass Transfer
Heat transfer by radiation mainly depends upon

Nature of the body
Kind and extent of its surface
Its temperature
All of these

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Heat and Mass Transfer
The rate of heat flow through a body is Q = [kA (T₁ - T₂)]/x. The term x/kA is known as

Thermal coefficient
Thermal resistance
None of these
Thermal conductivity

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Heat and Mass Transfer
Cork is a good insulator because it has

Atoms colliding frequency
Low density
Porous body
Free electrons

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Heat and Mass Transfer
A perfect black body is one which

Transmits all heat radiations
Is black in colour
Absorbs heat radiations of all wave lengths falling on it
Reflects all heat

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Heat and Mass Transfer
The critical temperature is the temperature

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

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

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

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