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Heat and Mass Transfer

Heat and Mass Transfer
Emissivity of a white polished body in comparison to a black body is

Same
Depends upon the shape of body
Lower
Higher

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Heat and Mass Transfer
When heat is transferred from hot body to cold body, in a straight line, without affecting the intervening medium, it is referred as heat transfer by

Radiation
Convection
Conduction
Conduction and convection

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Heat and Mass Transfer
Thermal conductivity of wood depends on

Density
All of these
Temperature
Moisture

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Heat and Mass Transfer
The process of heat transfer from one particle of the fluid to another by the actual movement of the fluid particles due to difference of density caused by temperature of the particle is known as

Free convection
Conduction
Radiation
Forced convection

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

Stanton number
Biot number
Peclet number
Nusselt number

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Heat and Mass Transfer
A heat exchanger with heat transfer surface area A and overall heat transfer coefficient U handles two fluids of heat capacities Cmax and Cmin. The number of transfer units (NTU) used in the analysis of heat exchanger is specified as

U/Cmin
Cmin/U
U/A.Cmin
U.Cmin

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