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Heat and Mass Transfer

Heat and Mass Transfer
The total emissivity power is .defined as the total amount of radiation emitted by a black body per unit

Area
Thickness
Temperature
Time

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Heat and Mass Transfer
The amount of heat flow through a body by conduction is

Dependent upon the material of the body
Directly proportional to the surface area of the body
Directly proportional to the temperature difference on the two faces of the body
All of these

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

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

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Heat and Mass Transfer
The unit of overall coefficient of heat transfer is

kcal/m² hr °C
kcal/hr °C
kcal/m hr °C
kcal/m²

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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
T
Absolute temperature
T2

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Heat and Mass Transfer
Which of the following has least value of conductivity?

Water
Plastic
Air
Glass

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