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

Related Mcqs:

1. 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.

2. 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

3. Reboiler is considered as one theoretical plate, because_____________________?

   A. Of the assumption that vapour and liquid leaving the reboiler are in equilibrium
   B. Vapour is recycled to the column
   C. Reboiler itself contains one plate
   D. None of these

4. At __________________ reflux, theoretical number of plates in a distillation coloumn is calculated using Fenske-Underwood equation?

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

5. 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

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

   A. 0
   B. 1
   C. ∞
   D. < 1

7. 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.

8. 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

9. In a single stage extraction process, 10 kg of pure solvent S (containing no solute A) is mixed with 30 kg of feed F containing A at a mass fraction xf = 0.2. The mixture splits into an extract phase E and a raffinate phase R containing A at xB = 0.5 and xR = 0.05 respectively. The total mass of the extract phase is (in Kg) ?

   A. 6.89
   B. 8.89
   C. 10
   D. 8.25

10. Polar organic compounds are normally used as separating agents for the azeotropic and extractive distillation. Which of the following is the most important factor to be considered for the choice of the separating agent for extractive distillation ?

    A. Cost
    B. Availability
    C. Toxicity
    D. Selectivity