Heat Transfer
In a gas-liquid shell and tube heat exchanger, the

Gases under high pressure are routed through the tube side, because high pressure gases are corrosive in nature
All of these
Presence of a non-condensible gas decreases the condensing film co-efficient
Gases to be heated/cooled is normally routed through the shell side, because the corrosion caused by the cooling water or steam condensate remain localised to the tubes

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Heat Transfer
In a shell and tube heat exchanger,

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
The relationship is not generalised

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