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

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

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Process Equipment and Plant Design
Pick out the wrong statement pertaining to the use of valve tray, seive tray and bubble cap trays in continuous distillation column.

Valve trays have the highest turn down ratio (i.e. the ratio of the highest to the lowest vapour flow rates) and thus provides the maximum flexible operating range
Maintenance cost for valve and seive trays are comparatively more than bubble cap tray due to their relatively complicated construction features
Murphree efficiency of all the three trays are nearly equal, however the peak efficiency is generally higher for seive and valve trays than the bubble cap
Bubble cap trays though most expensive are the best in situations, where low vapour rates is to be handled and a positive liquid seal is essential at all flow rates

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Process Equipment and Plant Design
A head comprises of straight flange section, corner torus, section and central dished section. Crown radius and knuckle radius in a head is related respectively to the

Straight flange section and corner torus section
Corner torus section and central dished section
Central dished section and straight flange section
Central dished section and corner torus section

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