Process Equipment and Plant Design
For given number of passes, pitch & tube diameter, the maximum number of tubes that can be accommodated in a shell of tripled inside diameter will be __________ times.

Considerably less than 9
About 3
About 9
Considerably more than 9

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Process Equipment and Plant Design
Pick out the wrong statement pertaining to shell and tube heat exchanger.

Baffles are supported independently of the tubes by tie rods and positioned by spacers
Clearance between shell & baffles and between tube & baffles should be minimum to avoid by-passing of the fluid, but it should be enough to permit the removal of tube bundle
Bracket supports are used for horizontal shell, while saddle support is used for vertical shell
Tie rods are fixed at one end in the tube sheet by making blind holes and the minimum number of tie rods is 4 with at least 10 mm diameter

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

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

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