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Heat and Mass Transfer

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

K calm/hr °C
K cal/kg m² °C
K cal/hr m² °C
K cal m/hr m² °C

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

Radiation
Conduction
Convection
None of these

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Heat and Mass Transfer
Thermal diffusivity is a

Dimensionless parameter
Physical property of a substance
Function of temperature
All of these

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

May increase or decrease depending on temperature
Decreases
Increases
Remain constant

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Heat and Mass Transfer
In a heat exchanger with one fluid evaporating or condensing, the surface area required is least in

Parallel flow
All of these
Counter flow
Cross flow

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Heat and Mass Transfer
In heat transfer, conductance equals conductivity (kcal/hr/sq.m/°C/cm) divided by

Hr (time)
K.cal (heat)
°C (temperature)
Sq. m (area)

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