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Heat and Mass Transfer

Heat and Mass Transfer
If the temperature of a solid surface changes form 27°C to 627°C, then its emissive power changes in the ratio of

81
270
9
3

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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
Shorter wavelength
Longer wavelength
Remain same at all wavelengths

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Heat and Mass Transfer
The insulation ability of an insulator with the presence of moisture would

Increase
Decrease
Remain unaffected
May increase/decrease depending on temperature and thickness of insulation

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

Air
Water
Plastic
Glass

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Heat and Mass Transfer
Upto the critical radius of insulation,

Added insulation will increase heat loss
Heat flux will decrease
Convective heat loss will be less than conductive heat loss
Added insulation will decrease heat loss

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Heat and Mass Transfer
Which of the following is the case of heat transfer by radiation?

Blast furnace
Cooling of parts in furnace
Heat received by a person from fireplace
Heating of building

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