Related Questions

In a distillation column, bubble caps are located on trays with a pitch of __________ times the outside diameter of the caps.
A 1.3 to 2
B 1.6 to 2
C 2.5
D 1.5 to 3
Two-fifths of the caps in a box are red, one-fourth are blue and the rest are green. What is the ratio of the green caps to the blue caps?
A 5 : 8
B 5 : 7
C 7 : 8
D 8 : 7
In distillation columns, the number of bubble caps per tray primarily depends upon the
A Allowable liquid velocity
B Allowable gas velocity
C Allowable gas and liquid velocities
D Feed composition
In the allocated cap area, bubble caps are generally arranged on equilateral triangular pitch. Number of caps fixed on a plate is with a
A Clearance of 25-75 mm
B Cap pitch of 1.3-2 times the cap diameter
C Either A or B
D Neither A nor B
Diameter of bubble caps used in high pressure columns is __________ as compared to that used in identical vacuum columns.
A Less
B More
C Same
D Either A or B; no generalisation can be made
For a given design of bubble cap, the number of bubble caps to be used per tray is set by the
A Allowable gas velocity through the slots
B Plate spacing
C Diameter of the column
D All of the above
In a distillation column, minimum clearance to be maintained betweeen the overflow weir and the last row of the bubble caps is __________ cms.
A 2.5
B 7.5
C 15
D 20
In actual operation of distillation column, the vapour is not distributed uniformly among the bubble caps, primarily because of the
A Liquid gradient on the tray
B Lower skirt clearance
C Lower static submergence
D Small downcomer liquid seal
On selling 30 caps, a shopkeeper earns profit equal to the selling price of 3 caps. What is the profit percentage?
A 12.5
B 11.11
C 10
D 14.28
__________ is the determining factor for the number of bubble caps to be used per tray.
A Permissible slot velocity
B Tray diameter
C Liquid load
D Vapor load

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