Reboiler is considered as one theoretical plate, because_____________________?

Related Mcqs:

1. An aqueous solution of methanol is to be distilled in a tray column. High pressure steam is available as a source of heat. For a given reflux ratio and overhead composition, two options are being explored; (i) a reboiler is used and (ii) no reboiler is used but steam is fed directly to the bottom of the column. As compared to option (i), in option (ii) ____________________?

   A. Less number of trays are required
   B. Composition of the residue remains unchanged
   C. More number of trays are required but the residue composition remains unchanged
   D. More number of trays are required and the residue composition is more dilute in methanol

2. In a distillation operation, what is the effect of the temperature of the reflux stream (given below) on the condenser and reboiler loads? Reflux conditions: (i) Reflux stream is completely liquid and is at its bubble point. (ii) Reflux stream is below its bubble point ?

   A. Condenser and reboiler loads are the same in both the cases
   B. Reboiler load is the same in both the cases but condenser load is higher in case (ii)
   C. Condenser load is the same in both the cases but reboiler load is higher in case (ii)
   D. Both condenser and reboiler loads are higher in case (ii) as compared to case (i)

3. In a packed tower, the value of HETP equals HTUOG, when the equilibrium and the operating lines are (where, HETP = height equivalent to a theoretical plate HTUOG = overall gas phase height of a transfer unit) ?

   A. Straight
   B. Parallel
   C. Both A. & B.
   D. Neither A. nor B.

4. In McCabe-Thiele method of theoretical plate calculation for a distillation column, the operating lines of stripping and rectifying sections coincide with the diagonal at ________________ reflux ?

   A. Total
   B. Minimum
   C. Operating
   D. Maximum permissible

5. The efficiency of a plate column will be maximum, when the flow is ideal __________________ the plate?

   A. Across
   B. Above
   C. Both A. & B.
   D. Neither A. nor B.

6. Which of the following is considered equivalent to one theoretical stage in Mc-Cabe Thiele’s method ?

   A. Partial condenser
   B. Total condenser
   C. Reboiler
   D. Both B. and C

7. Fenske equation for determining the minimum number of theoretical stages in distillation column holds good, when the_________________?

   A. Relative volatility is reasonably constant
   B. Mixture (to be separated) shows negative deviation from ideality
   C. Mixture (to be separated) shows positive deviation from ideality
   D. Multi-component distillation is involved

8. At what value of reflux ratio, number of theoretical plates in a distillation column is minimum ?

   A. 0
   B. 1
   C. ∞
   D. < 1

9. Fenske-Underwood equation used for calculating the minimum number of theoretical plates in distillation column is valid for_________________?

   A. Constant molal overflow
   B. Total reflux
   C. Constant relative volatility
   D. All A., B. and C.

10. The minimum number of theoretical plates is required for achieving a given separation in distillation column with_________________?

    A. No reflux
    B. Total reflux
    C. Zero reflux ratio
    D. Minimum reflux ratio