A. Height < 6
B. Diameter < 0.6
C. Both A. & B.
D. Neither A. nor B.
Related Mcqs:
- The reason for preferring packed towers over plate towers in distillation practice is that the packed tower operation gives___________________?
A. Low pressure drop and high hold up
B. High pressure drop and low hold up
C. Low pressure drop and low hold up
D. High pressure drop and high hold up - Use of packed towers for distillation is generally limited to the__________________?
A. Small sizes
B. Multi-component distillation
C. High pressure operation
D. Vacuum distillation - Use of packed towers for distillation is generally limited to the____________________?
A. Small sizes
B. Multi-component distillation
C. High pressure operation
D. Vacuum distillation - 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 - 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 At some point of time, the operation is shifted to total reflux condition (i.e., no product and residue are being withdrawn and feed to the column is stopped).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 - At the same gas flow rate, the pressure drop in a packed tower being irrigated with liquid _______________ that in dry packed tower ?
A. Is greater than
B. Is lower than
C. Is same as
D. Cannot be predicted as data are insufficient - With increase in the liquid flow rate at a fixed gas velocity in a randomly packed counter current gas-liquid absorption column, the gas pressure drop___________________?
A. Decreases
B. Remains unchanged
C. Increases
D. Decreases exponentially - In a packed bed absorption column, the channelling will be noted by the ____________________?
A. Increase in flow rate
B. Sharp drop in pressure drop
C. Sharp rise in pressure drop
D. None of these - Minimum possible diameter of a packed column is decided mainly by the________________________?
A. Flooding
B. Gas viscosity
C. Liquid density
D. Liquid hold up - Tray spacing in a distillation column of dia 10-12 ft. used in petroleum refinery may be around _____________ inches?
A. 5
B. 30
C. 60
D. 100
