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Heat and Mass Transfer

Heat and Mass Transfer
Thermal conductivity of water at 20°C is of the order of

0.1
0.23
0.51
0.42

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Heat and Mass Transfer
Upto the critical radius of insulation,

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

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

Low density
Free electrons
Porous body
Atoms colliding frequency

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Heat and Mass Transfer
The unit of overall coefficient of heat transfer is

kcal/m²
kcal/m hr °C
kcal/hr °C
kcal/m² hr °C

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Heat and Mass Transfer
The process of heat transfer from one particle of the body to another by the actual motion of the heated particles, is called

Radiation
None of these
Convection
Conduction

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Heat and Mass Transfer
Thermal diffusivity is

Used as mathematical model
A dimensionless parameter
A physical property of the material
Function of temperature

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