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Heat and Mass Transfer

Heat and Mass Transfer
The amount of radiation mainly depends on

Type of surface of body
Nature of body
Temperature of body
All of these

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Heat and Mass Transfer
According to Dalton's law of partial pressures, (where pb = Barometric pressure, pa = Partial pressure of dry air, and pv = Partial pressure of water vapour)

Pb = pa × pv
Pb = pa/pv
Pb = pa + pv
Pb = pa - pv

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Heat and Mass Transfer
A perfect black body is one which

Transmits all heat radiations
Is black in colour
Reflects all heat
Absorbs heat radiations of all wave lengths falling on it

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Heat and Mass Transfer
All radiations in a black body are

Reflected
Transmitted
Absorbed
Refracted

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Heat and Mass Transfer
Thermal conductivity of water _________ with rise in temperature.

Remain same
Decreases
May increase or decrease depending upon temperature
Increases

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

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

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