Process Equipment and Plant Design
Overall tray efficiency of a distillation column is the ratio of the number of

None of these
Ideal trays required to the number of real trays required
Real trays required to the number of ideal trays required
Overall gas transfer units to the number of ideal trays required

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Process Equipment and Plant Design
Seamless pipe is made

From rolled strips formed into cylinders and seam-welded
By extrusion & casting into static and centrifugal molds
By forging a solid round, piercing it by simultaneously rotating & forcing it over a piercer point and further reducing it by rolling gas drawing
Both B and C

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