In distillation, overhead product contains ______________________?

Related Mcqs:

1. The reflux to a distillation column is 100 moles/hr, when the overhead product rate is 50 moles/hr. The reflux ratio is____________________?

   A. 2
   B. 0.5
   C. 50
   D. 150

2. 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

3. According to the Fenske equation, what will be the minimum number of plates required in a distillation column to separate an equimolar binary mixture of components A and B into an overhead fraction containing 99 mol% A and a bottom fraction containing 98 mol% B ? Assume that relative volatility (αAB = 2) does not change appreciably in the column ?

   A. 5
   B. 9
   C. 12
   D. 28

4. With lapse of time, the overhead composition of light component in case of batch distillation with constant reflux__________________?

   A. Increases
   B. Decreases
   C. Remain same
   D. May increase or decrease; depends on system

5. Plate efficiency in a distillation column is reduced due to the ______________________ of liquid?

   A. Entrainment
   B. Foaming
   C. Weeping & dumping
   D. All A., B. & C.

6. In a distillation column, with increase in the reflux ratio, the heat removed in the cooler ______________________?

   A. Increases
   B. Decreases
   C. Remains unaffected
   D. And the heat required in reboiler decreases

7. Binary distillation involves the mass transfer by ______________________ at the gas-liquid interface?

   A. Unidirectional diffusion from liquid to gas phase
   B. Unidirectional diffusion from gas to liquid phase
   C. Either A. or B.
   D. A counter diffusion at an almost equal molar rate

8. 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

9. When the mixture to be distilled has a very high boiling point and the product material is heat sensitive, the separation technique to be used is _______________ distillation?

   A. Continuous
   B. Steam
   C. Azeotropic
   D. None of these

10. For a fixed number of ideal stages in a distillation column, as the reflux ratio is increased, the difference in composition between the top and bottom product streams__________________?

    A. Increases
    B. Decreases
    C. Remain unaffected
    D. Passes through a maximum