Related Questions

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
The reason for preferring packed towers over plate towers in distillation practice is that the packed tower operation gives
A Low pressure drop and high hold up
B High pressure drop and low hold up
C Low pressure drop and low hold up
D High pressure drop and high hold up
Plate towers are preferred to packed towers, when large temperature changes are involved, because of the reason that the
A Packing may be crushed due to thermal expansion/contraction of the components of the equipments
B Pressure drop in the equipment will be very high
C Viscosity variation of the fluids may cause channeling/flooding
D None of these
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
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
The equipment frequently used for adiabatic humidification-cooling operation with recirculating liquid is
A Natural draft cooling tower
B Induced draft cooling tower
C Spray chamber
D None of these
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 plate column is
A A finite stage contactor
B Used only for distillation, not for absorption
C A differential stage contactor
D A continuous contactor
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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