Process Equipment and Plant Design
Number of evaporators which can be used in service in a multiple effect evaporation system is limited by the

Both A & B
Economic limit reached, when the plant cost exceeds the saving of steam
Neither A nor B
Practical limit reached, due to low heat transfer rate because of inadequate temperature difference

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

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

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Process Equipment and Plant Design
Mc Cable Thiele method used for finding theoretical stages in a distillation column assumes that the

Liquid/vapor loading across the column remains constant
All of these
Sensible heat differences are small, because the temperature changes from tray to tray is small
Trouton's rule is applicable

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