In the layout plan for a vacuum distillation unit, operating at 60 mm Hg, supported by a barometric condenser, the appropriate place for the location of vacuum drum for collecting the distillate will be___________________?

Related Mcqs:

1. In the layout plan for a vacuum distillation unit, operating at 60 mm Hg, supported by a barometric condenser, the appropriate place for the location of vacuum drum for collecting the distillate will be_____________________?

   A. At ground level
   B. 2 metres above the ground
   C. 5 metres above ground
   D. 10 metres above ground

2. The amount of steam required per unit quantity of distillate in case of steam distillation will be reduced by __________________?

   A. Raising the temperature
   B. Lowering the total pressure
   C. Both A. and B.
   D. Neither A. nor B.

3. A distillation column separates 10000 kg/hr of a benzene-toluene mixture as shown in the figure below: In the figure xF, xD and xW represent the weight fraction of benzene in the feed, distillate and residue respectively. The reflux ratio is_______________ ?

   A. 0.5
   B. 0.6
   C. 1.0
   D. 2.0

4. In case of steam distillation, the steam leaving the liquid is not completely saturated with distillate vapour, because_______________?

   A. Temperature is less
   B. Total pressure is less
   C. Mixing of steam with the material being vaporised is not so intimate as to result in equilibrium
   condition
   D. Saturated steam is used for steam distillation

5. In most of the vacuum crystalliser, vacuum is generally produced by means of a_____________________?

   A. Suction pump
   B. Compressed air jet
   C. Steam jet ejector with a barometric condenser
   D. None of these

6. 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)

7. For ethanol-water system, the lowering of distillate quality from 95% to 92% will cause ______________ plate requirement?

   A. No change in theoretical
   B. Marginal decrease in the number of
   C. Major decrease in the number of
   D. None of these

8. For ethanol-water system, the lowering of distillate quality from 95% to 92% will cause ____________________ plate requirement?

   A. No change in theoretical
   B. Marginal decrease in the number of
   C. Major decrease in the number of
   D. None of these

9. 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

10. H2S is being absorbed in a gas absorber unit. The height of the transfer unit based on the overall mass transfer coefficient on the gas side is 0.4 m. The equilibrium data is given by, y = 1.5 x. The bulk concentration of H2S has to be reduced from 0.05 to 0.001 mole fraction in the gas side. The height of the tower (in meters) corresponding to an operating line given by, y = 5x + 0.001 is ______________________?

    A. 2.0
    B. 1.56
    C. 1.0
    D. 0.56