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Heat and Mass Transfer

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

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

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Heat and Mass Transfer
All radiations in a black body are

Refracted
Absorbed
Reflected
Transmitted

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Heat and Mass Transfer
Thermal conductivity of glass wool varies from sample to sample because of variation in

Composition
Porosity
Density
All of these

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Heat and Mass Transfer
The transfer of heat by molecular collision is known as

Radiation
Convection
None of these
Conduction

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Heat and Mass Transfer
Upto the critical radius of insulation,

Heat flux will decrease
Convective heat loss will be less than conductive heat loss
Added insulation will decrease heat loss
Added insulation will increase heat loss

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Heat and Mass Transfer
Moisture would find its way into insulation by vapour pressure unless it is prevented by

High thickness of insulation
High vapour pressure
A vapour seal
Less thermal conductivity insulator

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