Mass Transfer
In the layout plan for a vacuum distillation unit, operating at 60 mm Hg, supported by a barometric condenser, the appropriate place for the location of vacuum drum for collecting the distillate will be

10 metres above ground
5 metres above ground
2 metres above the ground
At ground level

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Mass Transfer
Flights in a rotary dryer are provided to

Reduce the residence time of solid
None of these
Increase the residence time of the solid
Lift and shower the solids thus exposing it thoroughly to the drying action of the gas

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