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

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

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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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