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

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

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Process Equipment and Plant Design
Bubble cap tray is the most commonly used tray in large distillation column, because

Of its flexibility and nearly constant efficiency under varying conditions of operation
None of these
It incurs less pressure drop as compared to any other try designed for the same duty
It eliminates the foaming and entrain-ment tendency during operation

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