Heat Transfer
In a shell and tube heat exchanger, square pitch compared to triangular pitch

Gives a higher shell side pressure drop
Can pack more surface area into a shell of given diameter
None of these
Gives a lower shell side pressure drop

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Heat Transfer
In a shell and tube heat exchanger,

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
There is no relationship between temperature drop and resistance
The relationship is not generalised

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