In a distillation column, minimum clearance to be maintained between the overflow weir and the last row of the bubble caps is ______________ cms?

Related Mcqs:

1. A minimum clearance of about _______________ mm is maintained between the distillation column wall and the bubble cap?

   A. 19
   B. 38
   C. 67
   D. 95

2. In a distillation column, bubble caps are located on trays with a pitch of ______________ times the outside diameter of the caps?

   A. 1.3 to 2
   B. 1.6 to 2
   C. 2.5
   D. 1.5 to 3

3. The ideal size of round bubble caps to be used in industrial distillation column having a diameter of 3-6 metres is ________________ cms?

   A. 5
   B. 15
   C. 7.5
   D. 50

4. In actual operation of distillation column, the vapour is not distributed uniformly among the bubble caps, primarily because of the_______________?

   A. Liquid gradient on the tray
   B. Lower skirt clearance
   C. Lower static submergence
   D. Small downcomer liquid seal

5. In case of bubble cap distillation column of diameter greater than 1.2 metres, the cap diameter is roughly about _______________ cms?

   A. 10
   B. 20
   C. 30
   D. 35

6. 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.

7. 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 A., B. and C.

8. In distillation columns, bubble caps are held in place over trays by ________________?

   A. Rivets
   B. A hold down bar
   C. Bolts
   D. Both B. and C.

9. The distance between the top of the slots and the liquid surface when the static liquid is just ready to flow over the overflow weir is called____________________?

   A. Downcomer liquid seal
   B. Static submergence
   C. Skirt clearance
   D. None of these

10. An adequate clearance between the tray and the shell wall of a distillation column is provided to_____________________?

    A. Drain the liquid from the tray when the unit is not in operation
    B. Allow for thermal expansion and facilitate installation
    C. Avoid back-trapping
    D. None of these