A. Using higher reflux ratio
B. Use of increased tray spacing
C. Increasing the liquid flow rate
D. Increasing the vapour flow rate
Related Mcqs:
- In a moderately sized packed absorption tower, channelling (which is most severe with stacked packings) can be minimised by taking the ratio of tower diameter to packing diameter ?
A. > 4 :1
B. < 8 : 1
C. > 8:1
D. < 6:1 - For the same system, if the same liquid used in an absorber is decreased, the tower height will__________________?
A. Increase
B. Decrease
C. Remain unaffected
D. Decrease or increase; depends on the type of liquid - A natural draft cooling tower is filled with wooden grids, which covers about _________________ percent of the tower height?
A. 10-15
B. 30-40
C. 70-80
D. 90-100 - Pressure drop through plate tower as compared to that through packed tower, for the same duty will be___________________?
A. Less
B. More
C. Equal
D. Either A. or B.; depends on the packing height - 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 - A packed tower compared to a plate tower for a particular mass transfer operation__________________?
A. Incurs smaller pressure drop
B. Allows installation of cooling coils
C. Is less costly when built in large sizes/diameters
D. Is more suitable, if suspended solids are present in fluid streams - Diameter of raschig rings used in packed tower in industry is normally around _____________________ inches?
A. 2
B. 8
C. 12
D. 18 - If the path of liquid across the plate is very long as in case of large diameter tower, Murphree efficiency can be _______________ percent?
A. 100
B. > 100
C. < 100
D. None of these - The wetted wall tower is used to determine_________________________?
A. Individual mass transfer co-efficient (M.T.C.) in gaseous system
B. M.T.C. of individual components in a liquid-liquid system
C. M.T.C. of liquid in liquid-gas system
D. The overall M.T.C. of the system - The term “cooling range” in a cooling tower refers to the difference in the temperature of____________________?
A. Cold water leaving the tower and the wet bulb temperature of the surrounding air
B. Hot water entering the tower and the wet bulb temperature of the surrounding air
C. Hot water entering the tower and the cooled water leaving the tower
D. None of these
