Heat and Mass Transfer
Conduction is a process of heat transfer

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

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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

Both may be put in any order
Inferior 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
Better insulation should be put over pipe and better one over it

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