Related Mcqs:

1. Pressure drop per tray in the atmospheric distillation column is about ________________ psi?

   A. 0.01 – 0.5
   B. 0.07 – 0.12
   C. 0.5 – 1.0
   D. 1 – 3

2. Overall tray efficiency of a distillation column is the ratio of the number of ___________________?

   A. Overall gas transfer units to the number of ideal trays required
   B. Ideal trays required to the number of real trays required
   C. Real trays required to the number of ideal trays required
   D. None of these

3. 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 entrainment tendency during operation
   D. None of these

4. 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

5. What is the value of ‘q’ for saturated vapor feed to a distillation column? (where q = fraction of the feed stream that is liquid ?

   A. 0
   B. 1
   C. 1

6. What is the slope of the feed line, if the feed to a distillation column is a saturated liquid ?

   A. 0
   B. ∞
   C. > 1
   D. < 1

7. The slope of the feed line in distillation operation is given by (where, q = fraction of the feed stream that is liquid ?

   A. -q
   B. -q/(1-q)
   C. -q/(q-1)
   D. None of these

8. Generally, as the length of the liquid path on a tray is increased beyond 5 ft, the overall column efficiency___________________?

   A. Increases
   B. Decreases
   C. Remain same
   D. May increase or decrease depending upon the plate spacing

9. _____________________ tray arrangement is recommended for distillation column having diameter upto 4 ft ?

   A. Radial flow
   B. Cross flow
   C. Split flow
   D. Cascade

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