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
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
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
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
The average of 17 results is 60. If the average of first 9 results is 57 and that of the last 9 results is 65, then what will be the value of 9th result?
A 39
B 78
C 117
D 156
For identical operating conditions, the pressure drop over __________ tray is the highest out of the following.
A Sieve
B Valve
C Counterflow
D Bubble cap
The property of a liquid which offers resistance to the movement of one layer of liquid over another adjacent layer of liquid, is called
A Surface tension
B Compressibility
C Capillarity
D Viscosity

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