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Heat and Mass Transfer

Heat and Mass Transfer
Heat transfer by radiation mainly depends upon

Kind and extent of its surface
Its temperature
Nature of the body
All of these

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Heat and Mass Transfer
Planck’s law holds good for

all coloured bodies
polished bodies
black bodies
All of these

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Heat and Mass Transfer
Unit of thermal conductivity in S.I. units is

Option (B) and (C) above
J/m °K sec
J/m² sec
W/m °K

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Heat and Mass Transfer
Thermal conductivity of solid metals with rise in temperature normally

Remain constant
May increase or decrease depending on temperature
Increases
Decreases

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Heat and Mass Transfer
The concept of overall coefficient of heat transfer is used in heat transfer problems of

Convection
Conduction
Conduction and convection
Radiation

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Heat and Mass Transfer
The heat transfer takes place according to

First law of thermodynamics
Second law of thermodynamics
Zeroth law of thermodynamics
Kirchhoff's law

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