A. Raschig
B. Lessing
C. Cross-partition
D. Single spiral
Related Mcqs:
- 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 - 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 - Most important factor to be considered in the selection of packings for absorbers is the ______________ of packing?
A. Size
B. Durability
C. Porosity
D. Cost - Most important factor to be considered in the selection of packings for absorbers is the ______________ of packing?
A. Size
B. Durability
C. Porosity
D. Cost - Which of the following is an undesirable property in a tower packing ?
A. Large surface per unit volume
B. Large free cross-section
C. Low weight per unit volume
D. Large weight of liquid retained - 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 - Stacked packing compared to dumped packing_________________?
A. Provides poorer contact between the fluids
B. Gives lower pressure drop
C. Both A. and B.
D. Gives higher pressure drop - 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 - Diameter of raschig rings used in packed tower in industry is normally around _____________________ inches?
A. 2
B. 8
C. 12
D. 18 - For which of the following unit operations, Lewis number is of significance ?
A. Adsorption
B. Binary distillation
C. Gas absorption
D. Humidification
