Process Equipment and Plant Design
Optimum reflux ratio in a continuous distillation column is determined by the

Flooding limit of the column
Maximum permissible vapour velocity
None of these
Total cost consideration (fixed cost of the column plus the cooling water & steam cost)

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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

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

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