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
Related Mcqs:
- Diameter of raschig rings used in packed tower in industry is normally around _____________________ inches?
A. 2
B. 8
C. 12
D. 18 - Very tall packed towers are divided into series of beds to___________________?
A. Reduce the overall pressure drop
B. Avoid channelling
C. Reduce liquid hold-up
D. Avoid flooding - In an absorption column, the flooding velocity for random packing is ___________________ that for stacked/regular packing?
A. Greater than
B. Smaller than
C. Equal to
D. Either A., or B.; depends on the type of packing - The most common packing used in industrial operations is _______________ rings?
A. Raschig
B. Lessing
C. Cross-partition
D. Single spiral - 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 - 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 - 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 - Raschig ring made of porcelain cannot be used for treating concentrated___________________?
A. Hydrochloric acid
B. Nitric acid
C. Alkalis
D. Sulphuric acid - Diameter to height ratio for a raschig ring is_____________________?
A. 1
B. 0.5
C. 2
D. 8 - 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
