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Heat and Mass Transfer

Heat and Mass Transfer
Which of the following has least value of conductivity?

Glass
Water
Plastic
Air

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Heat and Mass Transfer
The rate of energy transferred by convection to that by conduction is called

Nusselt number
Stanton number
Peclet number
Biot number

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Heat and Mass Transfer
Unit of thermal diffusivity is

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

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

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

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

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

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Heat and Mass Transfer
In case of liquids and gases, the heat transfer takes place according to

Radiation
None of these
Conduction
Convection

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MORE MCQ ON Heat and Mass Transfer

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