A. Reduce the overall pressure drop
B. Avoid channelling
C. Reduce liquid hold-up
D. Avoid flooding
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 - The main reason for dividing a tall packed tower into series of small towers is to________________________?
A. Minimise the overall pressure drop
B. Avoid flooding
C. Reduce liquid hold up
D. Avoid channelling - Plate towers are preferred to packed towers, when large temperature changes are involved, because of the reason that the____________________?
A. Packing may be crushed due to thermal expansion/contraction of the components of the
equipments
B. Pressure drop in the equipment will be very high
C. Viscosity variation of the fluids may cause channelling/flooding
D. None of these - Use of raschig rings in place of crushed stones as packing in packed beds (other things being same) ?
A. Increases pressure drop, increases surface area
B. Increases pressure drop, decreases surface area
C. Decreases pressure drop, increases surface area
D. Decreases pressure drop, decreases surface area - 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 - 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 - Water entrained by circulating air in cooling towers is termed as________________?
A. Drift
B. Blow down
C. Vapor load
D. None of these - Pick out the wrong statement pertaining to the cooling towers ?
A. In case of induced draft cooling tower, the fan is placed at the top of the tower
B. Effectiveness of forced draft cooling tower is reduced by the recirculation of the humid and
hot discharged air
C. A natural draft cooling tower is recommended to be used, when the air humidity is low and air
temperature is also low
D. Effectiveness of a mechanical draft cooling tower is reduced with increase in air wet-bulb
temperature - Pick out the wrong statement pertaining to the cooling towers ?
A. In case of induced draft cooling tower, the fan is placed at the top of the tower
B. Effectiveness of forced draft cooling tower is reduced by the recirculation of the humid and
hot discharged air
C. A natural draft cooling tower is recommended to be used, when the air humidity is low and air
temperature is also low
D. Effectiveness of a mechanical draft cooling tower is reduced with increase in air wet-bulb
temperature
