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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

Lower
Depends upon the shape of body
Higher
Same

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Heat and Mass Transfer
Heat transfer by radiation mainly depends upon

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

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Heat and Mass Transfer
When heat is transferred from one particle of hot body to another by actual motion of the heated particles, it is referred to as heat transfer by

Conduction and convection
Convection
Radiation
Conduction

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Heat and Mass Transfer
The amount of heat flow through a body by conduction is

All of these
Directly proportional to the temperature difference on the two faces of the body
Dependent upon the material of the body
Directly proportional to the surface area of the body

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Heat and Mass Transfer
The ratio of the emissive power and absorptive power of all bodies is the same and is equal to the emissive power of a perfectly black body. This statement is known as

Planck's law
Kirchhoff's law
Stefan's law
Wien's law

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Heat and Mass Transfer
Two plates spaced 150 mm apart are maintained at 1000°C and 70°C. The heat transfer will take place mainly by

Forced convection
Free convection
Convection
Radiation

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MORE MCQ ON Heat and Mass Transfer

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