Heat Transfer
Presence of a non-condensing gas in a condensing vapour

None of the listed here
is desirable to increase the film co-efficient
increases the rate of condensation
decreases thermal resistance

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Heat Transfer
In a shell and tube heat exchanger,

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

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