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Heat and Mass Transfer

Heat and Mass Transfer
All radiations in a black body are

Transmitted
Reflected
Refracted
Absorbed

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Heat and Mass Transfer
Thermal diffusivity is

Function of temperature
Used as mathematical model
A physical property of the material
A dimensionless parameter

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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 conductivity
None of these
Thermal resistance
Thermal coefficient

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Heat and Mass Transfer
The energy distribution of an ideal reflector at higher temperatures is largely in the range of

Wavelength has nothing to do with it
Longer wavelength
Shorter wavelength
Remain same at all wavelengths

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

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

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

Convection
Conduction
None of these
Radiation

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