A. Increase in Murphree plate efficiency
B. Decrease in pressure drop
C. Decrease in liquid hold up in the column
D. Increase in pressure drop
Related Mcqs:
- In an absorption column, the flooding velocity for random packing is ___________________ that for stacked/regular packing?
A. Greater than
B. Smaller than
C. Equal to
D. Either A., or B.; depends on the type of packing - Flooding in a column results due to___________________?
A. High pressure drop
B. Low pressure drop
C. Low velocity of the liquid
D. High temperature - According to the Fenske equation, what will be the minimum number of plates required in a distillation column to separate an equimolar binary mixture of components A and B into an overhead fraction containing 99 mol% A and a bottom fraction containing 98 mol% B ? Assume that relative volatility (αAB = 2) does not change appreciably in the column ?
A. 5
B. 9
C. 12
D. 28 - Packed column distillation is limited to the column _____________ metres?
A. Height < 6
B. Diameter < 0.6
C. Both A. & B.
D. Neither A. nor B. - A distillation column with N plates is being operated under normal conditions. At some point of time, the operation is shifted to total reflux condition (i.e., no product and residue are being withdrawn and feed to the column is stopped). At the new steady state ?
A. Composition of vapors and that of liquid do not vary throughout the column
B. Reboiler load and condenser load are minimum
C. The top and bottom compositions are unchanged with and without total reflux
D. The top and bottom compositions correspond to the maximum enrichment available - Polar organic compounds are normally used as separating agents for the azeotropic and extractive distillation. Which of the following is the most important factor to be considered for the choice of the separating agent for extractive distillation ?
A. Cost
B. Availability
C. Toxicity
D. Selectivity - Operating velocity in a packed tower is usually __________________ the flooding velocity ?
A. Half
B. Twice
C. Equal to
D. More than - Flooding in a vapor-liquid contacting equipment occurs in a tray, when the pressure drop through a tray is _______________ the liquid head available in the downcomer?
A. Less than
B. More than
C. Same as
D. Very much less - Under conditions of flooding in packed tower, the gas pressure drop___________________?
A. Decreases rapidly
B. Increases rapidly
C. Remain constant
D. Is maximum - When the feed to a distillation column is a saturated liquid, slope of the feed line is_____________________?
A. Zero
B. Unity
C. Infinity
D. None of these
