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Heat and Mass Transfer

Heat and Mass Transfer
The radiation emitted by a black body is known as

Full radiation
Total radiation
Black radiation
All of these

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Heat and Mass Transfer
Emissivity of a white polished body in comparison to a black body is

Higher
Same
Lower
Depends upon the shape of body

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

May increase or decrease depending on temperature
Remain constant
Decreases
Increases

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Heat and Mass Transfer
The heat is transferred by conduction, convection and radiation in

Melting of ice
Condensation of steam in condenser
Boiler furnaces
None of these

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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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Heat and Mass Transfer
Thermal conductivity of wood depends on

All of these
Moisture
Temperature
Density

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