Related Questions

A high vapour velocity is required for high plate efficiency in a seive plate coloumn. The satisfactory value of operating vapor velocity for design purpose in seive plate column is about __________ percent of the flooding velocity.
A 45
B 60
C 80
D 95
Bubble cap tray is the most commonly used tray in large distillation column, because
A Of its flexibility and nearly constant efficiency under varying conditions of operation
B It incurs less pressure drop as compared to any other try designed for the same duty
C It eliminates the foaming and entrain-ment tendency during operation
D None of these
Hole diameter of the seive trays in the distillation column ranges from __________ mm.
A 1 to 3
B 4 to 8
C 3 to 12.5
D 12.5 to 18.5
Flooding in a vapor-liquid contacting equipment occurs in a tray, when the pressure drop through a tray is __________ the liquid head available in the downcomer.
A Less than
B More than
C Same as
D Very much less
A rectangular sheet of paper, 10 cm long and 8 cm wide has squares of side 2 cm cut from each of its corner. The sheet is then folded to form a tray of depth 2cm. What is the volume of this tray?
A 32cm3
B 48cm3
C 49cm3
D 54cm3
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
Regeneration of molecular seive requires it to be heated to a temperature of about __________ °C.
A 80-120
B 200-300
C 600-800
D 1000-1100
An adequate clearance between the tray and the shell wall of a distillation column is provided to
A Drain the liquid from the tray when the unit is not in operation
B Allow for thermal expansion and facilitate installation
C Avoid back-trapping
D None of these
Overall tray efficiency of a distillation column is the ratio of the number of
A Overall gas transfer units to the number of ideal trays required
B Ideal trays required to the number of real trays required
C Real trays required to the number of ideal trays required
D None of these
Pressure drop per tray in the atmospheric distillation column is about __________ psi.
A 0.01 - 0.5
B 0.07 - 0.12
C 0.5 - 1.0
D 1 - 3

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