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

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Heat Transfer
In the equation Q = UAΔt; Δt is

Geometric mean temperature difference
Logarithmic mean temperature difference
Arithmetic mean temperature difference
The difference of average bulk temperatures of hot and cold fluids

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