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Heat and Mass Transfer

Heat and Mass Transfer
Heat transfer by radiation mainly depends upon

Kind and extent of its surface
Its temperature
Nature of the body
All of these

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Heat and Mass Transfer
Thermal conductivity of glass wool varies from sample to sample because of variation in

Composition
Porosity
All of these
Density

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Heat and Mass Transfer
The process of heat transfer from one particle of the body to another is called conduction, when the particles of the body

Does not affect the intervening medium
Affect the intervening medium
Do not move actually
Move actually

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Heat and Mass Transfer
The heat transfer from a hot body to a cold body is directly proportional to the surface area and difference of temperatures between the two bodies. This statement is called

Newton's law of cooling
Newton's law of heating
First law of thermodynamics
Stefan's law

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Heat and Mass Transfer
Free convection flow depends on

Density
Coefficient of viscosity
Gravitational force
All of these

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

J/m °K sec
J/m² sec
W/m °K
Option (B) and (C) above

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