A. Provides poorer contact between the fluids
B. Gives lower pressure drop
C. Both A. and B.
D. Gives higher pressure drop
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 - 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 - 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 - 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 - 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 - The most common packing used in industrial operations is _______________ rings?
A. Raschig
B. Lessing
C. Cross-partition
D. Single spiral - Absorption (liquid-gas system) with evolution of heat as compared to isothermal absorption results in_________________?
A. Decreased solute solubility
B. Large minimum liquid to gas (L/G) ratio
C. Large number of trays
D. All A., B. and C. - An aqueous solution of methanol is to be distilled in a tray column. High pressure steam is available as a source of heat. For a given reflux ratio and overhead composition, two options are being explored; (i) a reboiler is used and (ii) no reboiler is used but steam is fed directly to the bottom of the column. As compared to option (i), in option (ii) ____________________?
A. Less number of trays are required
B. Composition of the residue remains unchanged
C. More number of trays are required but the residue composition remains unchanged
D. More number of trays are required and the residue composition is more dilute in methanol
