A. Increasing the air velocity and area of exposed wet surface
B. Reducing the barometric pressure
C. Reducing the humidity of the air
D. All A., B. and C.
Related Mcqs:
- The cooling effect in a cooling tower cannot be increased by_____________________?
A. Increasing the air velocity over the wet surfaces
B. Reducing the humidity of entering air
C. Lowering the barometric pressure
D. None of these - 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 - 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 - 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 - 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 - 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 - _______________ number indicates the ratio of the rates of the heat and mass transfer incase of a cooling tower?
A. Sherwood
B. Stanton
C. Lewis
D. Peclet - An ideal tower packing should not _______________________?
A. Have low weight per unit volume
B. Have large surface area per unit volume
C. Have large free cross-section
D. Hold up large amount of liquid in the packing - When the temperature and humidity of air is low, we usually use _______________ draft cooling tower?
A. Natural
B. Forced
C. Induced
D. None of these
