Heat and Mass Transfer
According to Prevost theory of heat exchange

Heat transfer by radiation requires no medium
It is impossible to transfer heat from low temperature source to t high temperature source
Heat transfer in most of the cases takes place by combination of conduction, convection and radiation
All bodies above absolute zero emit radiation

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Heat and Mass Transfer
Conduction is a process of heat transfer

None of these
From a hot body to a cold body, in a straight line, without affecting the intervening medium
From one particle of the body to another without the actual motion of the particles
From one particle of the body to another by the actual motion of the heated particles

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Heat and Mass Transfer
A steam pipe is to be insulated by two insulating materials put over each other. For best results

Inferior insulation should be put over pipe and better one over it
Both may be put in any order
Better insulation should be put over pipe and better one over it
Whether to put inferior OIL over pipe or the better one would depend on steam temperature

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