Heat Transfer
With the increase of temperature, the Col-burn jH factor

May increase or decrease ; depending on temperature
Decreases
Increases
Remains unchanged

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Heat Transfer
In a shell and tube heat exchanger,

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

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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

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

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