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

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

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Process Equipment and Plant Design
In a vertical short tube evaporator (Calendria type), the

All of these
Area of central downtake is equal to 40 to 100% of total cross-sectional area of the surrounding tube
Liquor is inside the tube while the steam is outside the tube
Tube dia of 2.5-7.5 cms, tube length of 75-200 cms and cylinderical drum dia of 1-6 metres are normally used

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