Liquid gradient over a tray can be minimised by

A Providing a higher skirt clearance or a higher weir
B Decreasing the number of rows of caps through which the liquid flows or by decreasing the velocity of liquid flow past the caps or by reducing the distance along the tray through which the liquid must flow
C Using split flow, radial flow or cascade flow for column diameter large than 4 ft
D All of the above

Correct Answer: All of the above

Bissoy MCQ
#Chemical Engineering #Process Equipment And Plant Design

Related Questions

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
Maximum acceptable total liquid gradient over a tray is about __________ mm.
A 5.5
B 12.5
C 30.5
D 45.5
Liquid gradient over the tray results due to the
A Resistance offered to flow of liquids by caps & risers and the flow of gas
B Low gas velocity
C Large plate spacing
D Large reflux ratio
The maximum liquid gradient over a tray must not exceed
A 0.5" -1.25"
B 2"-3.5"
C 5"
D Half the tray spacing
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 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
Excessive liquid gradient on a tray may result in the
A Maldistribution of gas
B Back trapping
C Gas blowing beneath cap skit
D All of the above
A special type of liquid transporting device is the diffuser pump, in which __________ are minimised.
A Bearing losses
B Disk friction
C Shock losses
D Cavitation
Stack heat losses can be minimised by
A Controlling the excess air
B Oxygen enrichment of combustion air
C Using low c.v. fuels
D Maintaining proper draft in the furnace
In a moderately sized packed absorption tower, channeling (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

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