Heat and Mass Transfer
A grey body is one whose absorptivity

Varies with wavelength of the incident ray
Does not vary with temperature and. wavelength of the incident ray
Is equal to its emissivity
Varies with temperature

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Heat and Mass Transfer
Film coefficient is defined as the ratio of

Thickness of film of fluid to the temperature drop through the films of fluids
Thickness of film of fluid to the thermal conductivity
Temperature drop through the films of fluids to the thickness of film of fluids
Thermal conductivity to the equivalent thickness of the film of fluid

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