Bubble cap plate column is___________________?

Related Mcqs:

1. Pick out the wrong statement about the design of sieve plate column and the bubble cap column ?

   A. The downcomer design and the residence time in the downcomer is almost same for sieve
   plate and bubble cap columns
   B. Weir length for a bubble cap plate is the same as that for the sieve plate
   C. Weir height for a bubble cap plate column is the same as that for a sieve plate column
   D. Weir height in case of a bubble cap plate ranges from 50 to 150 mm and is higher than the
   sieve plate

2. 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

3. A high vapour velocity is required for high plate efficiency in a sieve plate column. The satisfactory value of operating vapor velocity for design purpose in sieve plate column is about _______________ percent of the flooding velocity?

   A. 45
   B. 60
   C. 80
   D. 95

4. Typical static submergence for bubble cap plate column operating at atmospheric pressure may be around _________________?

   A. 2.5″
   B. 0.5″
   C. 5″
   D. 50% of the plate spacing

5. 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.

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. Bubble cap diameter used for the distillation column having diameter ranging from 1.5 to 4.5 metres is about ______________ mm?

   A. 10
   B. 50
   C. 100
   D. 200

8. Pick out the wrong statement pertaining to the use of valve tray, seive tray and bubble cap trays in continuous distillation column ?

   A. Bubble cap trays though most expensive are the best in situations, where low vapour rates is to be handled and a positive liquid seal is essential at all flow rates
   B. Murphree efficiency of all the three trays are nearly equal, however the peak efficiency is generally higher for sieve and valve trays than the bubble cap
   C. Maintenance cost for valve and sieve trays are comparatively more than bubble cap tray due to their relatively complicated construction features
   D. Valve trays have the highest turn down ratio (i.e. the ratio of the highest to the lowest vapour flow rates) and thus provide the maximum flexible operating range

9. In common bubble cap distillation column design practice, riser area is approximately equal to (where, Aa = Annular passage area, and Sa = Slot area) ?

   A. Aa = Sa
   B. 1.2 Aa = 1.2 Sa
   C. Sa = 1.5 Aa
   D. Aa = 1.5 Sa

10. 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