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Heat and Mass Transfer

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

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

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Heat and Mass Transfer
Thermal conductivity of air at room temperature in kcal/m hr °C is of the order of

0.1
0.01
0.002
0.02

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Heat and Mass Transfer
In regenerator type heat exchanger, heat transfer takes place by

Flow of hot and cold fluids alternately over a surface
A complete separation between hot and cold fluids
Generation of heat again and again
Direct mixing of hot and cold fluids

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Heat and Mass Transfer
The product of Reynolds number and Prandtl number is known as

Stanton number
Grashoff number
Peclet number
Biot number

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Heat and Mass Transfer
Reynolds number is the ratio of

None of these
Energy transferred by convection to that by conduction
Kinematic viscosity to thermal diffusivity
Inertia force to viscous force

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Heat and Mass Transfer
Stefan Boltzmann law is applicable for heat transfer by

Radiation
Conduction and radiation combined
Conduction
Convection

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MORE MCQ ON Heat and Mass Transfer

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