A. Allowable liquid velocity
B. Allowable gas velocity
C. Allowable gas and liquid velocities
D. Feed composition
Related Mcqs:
- In a distillation operation, what is the effect of the temperature of the reflux stream (given below) on the condenser and reboiler loads? Reflux conditions: (i) Reflux stream is completely liquid and is at its bubble point. (ii) Reflux stream is below its bubble point ?
A. Condenser and reboiler loads are the same in both the cases
B. Reboiler load is the same in both the cases but condenser load is higher in case (ii)
C. Condenser load is the same in both the cases but reboiler load is higher in case (ii)
D. Both condenser and reboiler loads are higher in case (ii) as compared to case (i) - 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 - For a distillation column operating at minimum reflux, the_______________________?
A. Concentration of liquid and vapour leaving a plate will be same
B. Reflux ratio will be maximum
C. Number of plates required will be maximum
D. None of these - In stripping section of continuous distillation column, the_______________________?
A. Liquid is stripped of high boiler
B. Liquid is enriched with high boiler
C. Vapour is stripped of low boiler
D. None of these - 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 - With decrease in the throughput (compared with the design capacity) for a bubble cap distillation column, its efficiency____________________?
A. Increases
B. Decreases
C. Remain same
D. May increase or decrease; depends on individual design - Inside the distillation columns, the ________________________?
A. Highest temperatures is near the feed plate
B. Driving force for the liquid flow is its weight
C. Vapors are not always at their dew points
D. All A., B. and C. - 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 - The interfacial area per unit volume of dispersion, in a gas-liquid contactor, for fractional hold up of gas = 0.1 and gas bubble diameter = 0.5 mm is given by (in m2/m3)_________________?
A. 500
B. 1200
C. 900
D. 800 - The interfacial area per unit volume of dispersion, in a gas-liquid contactor, for fractional hold up of gas = 0.1 and gas bubble diameter = 0.5 mm is given by (in m2/m3) ?
A. 500
B. 1200
C. 900
D. 800
