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Heat and Mass Transfer

Heat and Mass Transfer
Which of the following is a case of steady state heat transfer?

Heating of building in winter
I.C. engine
Air preheaters
None of these

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Heat and Mass Transfer
According to Stefan Boltzmann law, the total radiation from a black body per second per unit area is directly proportional to the

Fourth power of the absolute temperature
Square of the absolute temperature
Cube of the absolute temperature
Absolute temperature

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Heat and Mass Transfer
In a heat exchanger with one fluid evaporating or condensing, the surface area required is least in

All of these
Counter flow
Cross flow
Parallel flow

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Heat and Mass Transfer
Thermal conductivity of non-metallic amorphous solids with decrease in temperature

Decreases
Increases
Remain constant
May increase or decrease depending on temperature

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Heat and Mass Transfer
According to Kirchoff's law, the ratio of emissive power to absorptivity for all bodies is equal to the emissive power of a

Red hot body
Grey body
Black body
Brilliant white polished body

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Heat and Mass Transfer
A grey body is one whose absorptivity

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

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