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Heat and Mass Transfer

Heat and Mass Transfer
The critical radius is the insulation radius at which the resistance to heat flow is

Maximum
None of these
Zero
Minimum

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Heat and Mass Transfer
In free convection heat transfer, Nusselt number is function of

Grashoff number and Prandtl number
Prandtl number and Reynold number
Grashoff number and Reynold number
Grashoff number, Prandtl number and Reynold number

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Heat and Mass Transfer
The rate of energy emission from unit surface area through unit solid angle, along a normal to the surface, is known as

Intensity of radiation
Reflectivity
Emissivity
Transmissivity

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Heat and Mass Transfer
Thermal conductivity of non-metallic amorphous solids with decrease in temperature

Decreases
May increase or decrease depending on temperature
Increases
Remain constant

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

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

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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

Forced convection
Radiation
Conduction
Free convection

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