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Heat and Mass Transfer

Heat and Mass Transfer
The amount of radiation mainly depends on

Nature of body
All of these
Type of surface of body
Temperature of body

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Heat and Mass Transfer
In heat transfer, conductance equals conductivity (kcal/hr/sq.m/°C/cm) divided by

Sq. m (area)
Hr (time)
°C (temperature)
K.cal (heat)

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Heat and Mass Transfer
The total radiation from a black body per second per unit area is ________ fourth power of the absolute temperature. This statement is known as Stefan Boltzmann law.

Inversely proportional to
None of these
Equal to
Directly proportional to

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Heat and Mass Transfer
Sensible heat is the heat required to

Convert water into steam and superheat it
Change liquid into vapour
Increase the temperature of a liquid of vapour
Change vapour into liquid

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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

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

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Heat and Mass Transfer
The heat of sun reaches to us according to

Conduction
Radiation
Convection
None of these

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