Process Equipment and Plant Design
Which of the following is the most common type of baffle used in industrial shell and tube heat exchanger?

Disk and doughnut baffle
75% cut segmental baffle
Orifice baffle
25% cut segmental baffle

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

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Process Equipment and Plant Design
Ponchon Savarit method is based on the use of enthalpy concentration diagram, which contains the bubble point curve (saturated liquid curve), dew point curve (saturated vapour curve) and equilibrium tie lines. As compared to McCabe-Thiele's method, this method

Accounts for the enthalpy changes in the process
Is more accurate in finding the number of equilibrium stages
All of these
Facilitates direct calculation of heat load on reboiler & condenser from, the diagram used in this method

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

In differential (simple) distillation, the vapour is removed as soon as it is formed without appreciable condensation
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
Distillation under vacuum is a substitute for steam distillation

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