In packed absorption tower, onset of flooding usually occurs at a pressure drop of about __________ mm of water column per metre height of packing.

Process Equipment and Plant Design
In packed absorption tower, onset of flooding usually occurs at a pressure drop of about __________ mm of water column per metre height of packing.

50-75

750-1000

200-250

25-50

50-75

750-1000

200-250

25-50

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Process Equipment and Plant Design
Generally, as the length of the liquid path on a tray is increased beyond 5 ft, the overall column efficiency

Remains same

Decreases

May increase or decrease depending upon the plate spacing

Increases

Remains same

Decreases

May increase or decrease depending upon the plate spacing

Increases

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Process Equipment and Plant Design
Pick out the wrong statement about the design of seive plate column and the bubble cap column.

Weir height for a bubble cap plate column is the same as that for a seive plate column

Weir height in case of a bubble cap plate ranges from 50 to 150 mm and is higher than the seive plate

Weir length for a bubble cap plate is the same as that for the seive plate

The downcomer design and the residence time in the downcomer is almost same for seive plate and bubble cap columns

Weir height for a bubble cap plate column is the same as that for a seive plate column

Weir height in case of a bubble cap plate ranges from 50 to 150 mm and is higher than the seive plate

Weir length for a bubble cap plate is the same as that for the seive plate

The downcomer design and the residence time in the downcomer is almost same for seive plate and bubble cap columns

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Process Equipment and Plant Design
Pick out the wrong statement pertaining to the design of the bubble cap tray of a distillation column to give stable operation and even vapour distribution.

The pressure drop due to the caps & slots and the static submergence should be as high as practicable for reasonable operation

The dimensionless ratio of liquid gradient to pressure drop head caused by the bubble cap assembly should be less than 0.4

Tendency towards stable operation is increased by increasing the skirt clearance of the caps, lowering the rate of liquid flow per unit plate width or increasing the spacing between the caps

None of these

The pressure drop due to the caps & slots and the static submergence should be as high as practicable for reasonable operation

The dimensionless ratio of liquid gradient to pressure drop head caused by the bubble cap assembly should be less than 0.4

Tendency towards stable operation is increased by increasing the skirt clearance of the caps, lowering the rate of liquid flow per unit plate width or increasing the spacing between the caps

None of these

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Process Equipment and Plant Design
In common bubble cap distillation column design practice, riser area is approximately equal to (where, Aa = Annular passage area, and Sa = Slot area)

Aa = 1.5 Sa

1.2 Aa = 1.2 Sa

Aa = Sa

Sa = 1.5 Aa

Aa = 1.5 Sa

1.2 Aa = 1.2 Sa

Aa = Sa

Sa = 1.5 Aa

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Process Equipment and Plant Design
For storing hazardous chemicals in large storage tanks, the minimum safe distance between the two tanks should range between __________ times the tank diameter.

4 to 5

1 to 1.5

2.5 to 3.5

6 to 8

4 to 5

1 to 1.5

2.5 to 3.5

6 to 8

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Process Equipment and Plant Design

Process Equipment and Plant Design In packed absorption tower, onset of flooding usually occurs at a pressure drop of about __________ mm of water column per metre height of packing.

Process Equipment and Plant Design Generally, as the length of the liquid path on a tray is increased beyond 5 ft, the overall column efficiency

Process Equipment and Plant Design Pick out the wrong statement about the design of seive plate column and the bubble cap column.

Process Equipment and Plant Design Pick out the wrong statement pertaining to the design of the bubble cap tray of a distillation column to give stable operation and even vapour distribution.

Process Equipment and Plant Design In common bubble cap distillation column design practice, riser area is approximately equal to (where, Aa = Annular passage area, and Sa = Slot area)

Process Equipment and Plant Design For storing hazardous chemicals in large storage tanks, the minimum safe distance between the two tanks should range between __________ times the tank diameter.

Process Equipment and Plant Design
In packed absorption tower, onset of flooding usually occurs at a pressure drop of about __________ mm of water column per metre height of packing.

Process Equipment and Plant Design
Generally, as the length of the liquid path on a tray is increased beyond 5 ft, the overall column efficiency

Process Equipment and Plant Design
Pick out the wrong statement about the design of seive plate column and the bubble cap column.

Process Equipment and Plant Design
Pick out the wrong statement pertaining to the design of the bubble cap tray of a distillation column to give stable operation and even vapour distribution.

Process Equipment and Plant Design
In common bubble cap distillation column design practice, riser area is approximately equal to (where, Aa = Annular passage area, and Sa = Slot area)

Process Equipment and Plant Design
For storing hazardous chemicals in large storage tanks, the minimum safe distance between the two tanks should range between __________ times the tank diameter.