Process Equipment and Plant Design
The most common standard size of bubble caps used in industrial operation is

4" dia cap with 8" dia riser
8" dia cap with 1" dia riser
1" dia cap with 0.5" dia riser
6" dia cap with 4" dia riser

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

Flash distillation, differential distillation & steam distillation are all continuous distillation processes
Distillation under vacuum is a substitute for steam distillation
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

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