Process Equipment and Plant Design
A pipe is generally made of circular cross-section, because a circular cross-section has the

None of these
Higher structural strength
Lowest surface area requirement for a given volume
Both A & B

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Process Equipment and Plant Design
Triangular pitch tube layout as compared to square pitch in a shell and tube heat exchanger

Permits the use of more tubes in a given shell diameter
Both B and C
Permits the use of less tubes in a given shell diameter
Facilitates comparatively easier external cleaning because of large clearance

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Process Equipment and Plant Design
Pick out the wrong statement about distillation operation

Distillation under vacuum is a substitute for steam distillation
In flash (equilibrium) distillation, a definite fraction of liquid is vaporised in such a way that the evolved vapour & residual liquids are in equilibrium with each other
Flash distillation, differential distillation & steam distillation are all continuous distillation processes
In differential (simple) distillation, the vapour is removed as soon as it is formed without appreciable condensation

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