Process Equipment and Plant Design
The length of straight rectangular weir used on cross-flow trays is generally __________ the column diameter.

0.6-0.8 times
Twice
Equal to
2 ft irrespective of (for column > 3 ft diameter)

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Process Equipment and Plant Design
In the design of a shell and tube heat exchanger, the corrosion allowance

All of these
Need not be provided for non-pressure parts like tie rods, spacers, baffles, supports etc
For internal cover and tube sheet is provided on both the sides
For carbon steel and cast iron pressure parts is 1.5 mm (except for tubes) and for severe conditions it is 3 mm

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