Typical static submergence for bubble cap plate column operating at atmospheric pressure may be around

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

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

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

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 compressor that takes suction at a pressure below atmospheric and discharge against atmospheric pressure is called a __________ pump.

A

Sump

B

Volute

C

Vacuum

D

Submerged

The coastline formed by the submergence of mountain ridges running parallel to the coast is known as ________

A

Dalmation coast

B

Ria coast

C

Fiord coast

D

Haff coast

Which of the following are known as coastlines of submergence?

A

Ria coasts

B

Uplifted lowland

C

Emergent upland

D

Concordant coasts

Typical static submergence for bubble cap plate column operating at atmospheric pressure may be around

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