Mass Transfer
In McCabe-Thiele method of theoretical plate calculation for a distillation column, the operating lines of stripping and rectifying sections coincide with the diagonal at __________ reflux.

Total
Minimum
Maximum permissible
Operating

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Mass Transfer
Channelling is most severe

In dumped packing of regular units
In towers packed randomly with crushed solids
In towers packed with stacked packing
At very high liquid flow rate

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