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Heat and Mass Transfer

Heat and Mass Transfer
All radiations in a black body are

Absorbed
Transmitted
Refracted
Reflected

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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

Counter flow
Parallel flow
All of these
Cross flow

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Heat and Mass Transfer
Two plates spaced 150 mm apart are maintained at 1000°C and 70°C. The heat transfer will take place mainly by

Forced convection
Convection
Radiation
Free convection

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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

Grey body
Brilliant white polished body
Black body
Red hot body

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Heat and Mass Transfer
Thermal conductivity of air with rise in temperature

Remain constant
May increase or decrease depending on temperature
Decreases
Increases

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Heat and Mass Transfer
Cork is a good insulator because it has

Atoms colliding frequency
Porous body
Free electrons
Low density

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