Heat and Mass Transfer
Conduction is a process of heat transfer

From a hot body to a cold body, in a straight line, without affecting the intervening medium
None of these
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

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Heat and Mass Transfer
According of Kirchhoff's law

Emissive power and absorptivity are constant for all bodies
Emissive power depends on temperature
Ratio of emissive power to absorptive power for all bodies is same and is equal to the emissive power of a perfectly black body
Radiant heat is proportional to fourth power of absolute temperature

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Heat and Mass Transfer
A steam pipe is to be lined with two layers of insulating materials of different thermal conductivities. For the minimum heat transfer,

One should take into account the steam temperature before deciding as to which insulation is put where
The better insulation must be put inside
One could place either insulation on either side
The better insulation must be put outside

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