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Heat and Mass Transfer

Heat and Mass Transfer
The concept of overall coefficient of heat transfer is used in heat transfer problems of

Conduction and convection
Convection
Conduction
Radiation

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Heat and Mass Transfer
Heat transfer takes place as per

Second law of the thermodynamics
Zeroth law of thermodynamics
Kirchoff's law
First law of thermodynamic

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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
Stefan's law
First law of thermodynamics

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Heat and Mass Transfer
Two long parallel surfaces each of emissivity 0.7 are maintained at different temperatures and accordingly have radiation heat exchange between them. It is desired to reduce 75% of the radiant heat transfer by inserting thin parallel shields of emissivity 1 on both sides. The number of shields should be

Four
Two
Three
One

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Heat and Mass Transfer
Thermal diffusivity of a substance is

Inversely proportional to density of substance
Inversely proportional to specific heat
All of these
Directly proportional to the thermal conductivity

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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
Forced convection
Conduction
Radiation

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