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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Heat Transfer
Nusselt number is the ratio of the

Heat flux at the wall to that across the entire pipe
None of these
Temperature difference to the temperature gradient at the wall
Temperature gradient of the wall to that across the entire pipe

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