Process Equipment and Plant Design
Le/D for a Tee (used as elbow, entering branch) would be

More than that for Tee (used as elbow, entering run)
Around 90
Less than that for Tee (used as elbow, entering run)
Both B and C

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Process Equipment and Plant Design
The function of manholes provided in the shell of a distillation column is to

Guard against foaming & entrainment by dumping antifoaming agent through it
All of these
Keep a check on the liquid gradient over the plate by direct visual observation
Give access to the individual trays for cleaning, maintenance and installation

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

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

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