Heat Transfer
Heat transfer by conduction results due to the transfer of free electrons, kinetic energy & vibrational energy from one molecule to another. Conduction heat transfer can not take place

Between two bodies not in physical contact with each other
From one part of a body to the another part of the same body
Between two bodies in physical contact with each other
Both B & C

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Heat Transfer
In a shell and tube heat exchanger,

There is no relationship between temperature drop and resistance
The relationship is not generalised
The temperature drop is inversely proportional to the resistance across which the drop occurs
The temperature drops in the two fluids and the wall are proportional to individual resistances

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