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
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
Bracket supports are used for horizontal shell, while saddle support is used for vertical shell

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Process Equipment and Plant Design
Pick out the wrong statement pertaining to the design of the distillation column.

The purpose of the slot is to disperse the gas into the liquid in the form of small bubbles
If sufficient slot area is not provided, the gas may pass through the skirt clearance
Generally, a skirt clerance of 0.5" to 1.5' is recommended to prevent plugging of the slots by residue build up
None of these

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Process Equipment and Plant Design
Mc Cable Thiele method used for finding theoretical stages in a distillation column assumes that the

Sensible heat differences are small, because the temperature changes from tray to tray is small
Liquid/vapor loading across the column remains constant
Trouton's rule is applicable
All of these

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Process Equipment and Plant Design
Number of evaporators which can be used in service in a multiple effect evaporation system is limited by the

Economic limit reached, when the plant cost exceeds the saving of steam
Practical limit reached, due to low heat transfer rate because of inadequate temperature difference
Both A & B
Neither A nor B

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