Related Questions

Typical static submergence for bubble cap plate column operating at atmospheric pressure may be around
A 2.5"
B 0.5"
C 5"
D 50% of the plate spacing
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 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
With decrease in the throughput (compared with the design capacity) for a bubble cap distillation column, its efficiency
A Increases
B Decreases
C Remains same
D May increase or decrease ; depends on individual design
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
A minimum clearance of about __________ mm is maintained between the distillation column wall and the bubble cap.
A 19
B 38
C 76
D 95
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
Even though bubble cap towers are very effective for humidification operation, they are not used commonly in industries, because of the
A High evaporation losses of water
B High pressure drop of the gas
C Difficulty in its fabrication
D None of these
In actual operation of a bubble cap distillation tower, the __________ at the bottom of the tower is more than that at the top of the tower.
A Molal flow rate of vapour
B Vapour molecular weight
C Pressure and temperature
D All of the above
Maximum allowable vapour velocity in a bubble cap tower is determined by the
A Entrainment considerations
B Vapour density
C Diameter of the column
D None of these

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