Heat Transfer
In a shell and tube heat exchanger,

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

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Heat Transfer
Air is to be heated by condensing steam. Two heat exchangers are available (i) a shell and tube heat exchanger and (ii) a finned tube heat exchanger. Tube side heat transfer area are equal in both the cases. The recommended arrangement is

Shell and tube heat exchanger with air inside tubes and steam on shell side
Finned tube heat exchanger with air outside and steam inside
Shell and tube heat exchanger with air on shell side and steam inside tubes
Finned tube heat exchanger with air inside and steam outside

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