Heat Transfer
Tubes are held between top and bottom tube sheets in Calenderia type evaporator by keeping

Both the tube sheets floating
The top tube sheet floating and bottom tube sheet fixed
The top tube sheet fixed and the bottom tube-sheet floating
Both the tube sheets fixed

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Heat Transfer
In a shell and tube heat exchanger,

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

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