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

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

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

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
Presence of a non-condensible gas decreases the condensing film co-efficient
All of these
Gases under high pressure are routed through the tube side, because high pressure gases are corrosive in nature

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