One mole feed of a binary mixture of a given composition is flash vaporised at a fixed P and T. If Raoult’s law is obeyed, then changing the feed composition would effect ?

Related Mcqs:

1. On moving the feed line (q-line) from saturated liquid feed (vertical position) to saturated vapor feed (horizontal feed), if the slope of both the operating lines are to be increased, then it will result in______________________?

   A. Greater degree of separation with a fixed number of trays
   B. Increased reboiler load
   C. Increased reflux ratio
   D. None of these

2. In a binary distillation column, if the feed contains 40 mole % vapour, the q line will have a slope of_________________?

   A. 1.5
   B. -0.6
   C. -1.5
   D. 0.6

3. The relative volatility of a binary mixture at the Azeotropic composition is _______________________?

   A. 1
   B. > 1
   C. 0
   D. ∞

4. If f = moles of vapour present per mole of feed, then the slope of feed line is (McCabe- Thiele method) ________________________?

   A. (1 – f)/f
   B. – (f – 1)/f
   C. -1/f
   D. -f/(1 – f)

5. Flash distillation is suitable for separating the constituents of a binary system, which _____________________?

   A. Form minimum boiling azeotrope
   B. Have very wide boiling points
   C. Have very close boiling points
   D. Form constant boiling azeotrope

6. For a binary mixture distillation process, the degree of freedom is 2. However, if the pressure is fixed in this process, the number of independent variables in this process will be ___________________?

   A. 1
   B. 0
   C. 2
   D. 3

7. Experiments were conducted to determine the flux of a species A in a stagnant medium across a gas-liquid interface. The overall mass transfer co-efficient based on the liquid side for dilute systems for the above was estimated to be 4 × 10-3 kg mole/m2.s. The equilibrium data for the system is given as y = 2x. The flux across the interface (in kg mole/m2 .s) for bulk concentrations of A in gas phase and liquid phase as y = 0.4 and x = 0.01 respectively is _________________________?

   A. 5.6 × 10-4
   B. 8.5 × 10-4
   C. 5.6 × 10-3
   D. 8.5 × 10-3

8. The equilibrium liquid composition compared to the vapor composition in case of________________?

   Azeotropic mixture is
   A. More
   B. Less
   C. Same
   D. Either more or less; depends on the system

9. The diffusivity D. in a binary gas mixture is related to the pressure (P) as___________________?

   A. D ∝ P0.5
   B. D ∝ 1/P0.5
   C. D ∝ 1/P
   D. D ∝ 1/P1.5

10. Components, having widely different boiling point in a binary mixture, can be separated using ________________ distillation?

    A. Molecular
    B. Extractive
    C. Steam
    D. Simple