Process Equipment and Plant Design
In a multipass shell and tube heat exchanger, the problem of differential expansion between the shell and tube passes is taken care of by using a

U-bend
Either A or B
Neither A nor B
Floating head tube sheet

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Process Equipment and Plant Design
In a vertical short tube evaporator (Calendria type), the

All of these
Area of central downtake is equal to 40 to 100% of total cross-sectional area of the surrounding tube
Liquor is inside the tube while the steam is outside the tube
Tube dia of 2.5-7.5 cms, tube length of 75-200 cms and cylinderical drum dia of 1-6 metres are normally used

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Process Equipment and Plant Design
A forced circulation long tube vertical evaporator as compared to the natural circulation evaporator

Both B & C
Is economical in operation
Employs high velocity, high heat transfer rate and less heating surface requirement
Employs a centrifugal pump placed between external downtake from vapor drum and inlet to tube bundle

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Process Equipment and Plant Design
In a bag filter, the pressure drop increases directly as the

Density of the gas, but is independent of the viscosity of the gas
Density of the gas and inversely as viscosity of the gas
None of these
Viscosity of the gas and inversely as density of the gas

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