Distillation-Differential Distillation (Rayleigh Equation) multiple choice questions

 Distillation-Differential Distillation (Rayleigh Equation)

1. For a ternary mixture, the number of cuts required is_________
a) 1
b) 2
c) 3
d) 4
Answer: 2
2. Estimate the feed rate, if the composition of the more volatile component in the feed is 50% and the residue is 10% and the equilibrium relation is given by y*= 1.975x. Also, the rate of residue is 60 mol/hr.
a) 213 mol/hr
b) 313 mol/hr
c) 413 mol/hr
d) 513 mol/hr
Answer: 313 mol/hr
3. The initial portion of the distillate will be a low volatile component.
a) True
b) False
Answer: False
4. Find the rate of distillate, if the composition of the more volatile component in the feed is 50% and the residue is 10% and the equilibrium relation is given by y*= 1.975x. Also the rate of residue is 60 mol/hr.
a) 153 mol/hr
b) 253 mol/hr
c) 353 mol/hr
d) 453 mol/hr
Answer: 253 mol/hr
5. After the separation by differential distillation, the high volatile and low volatile components are stored in _____________
a) Batch
b) Cuts
c) Distill
d) None of the mentioned
Answer: Cuts
5. The column used for differential distillation is_______________
a) Still
b) Differential column
c) Batch column
d) None of the mentioned
Answer: Still
6. Pre-cooling is required before passing the vapour to the condenser in a still.
a) True
b) False
Answer: False
7. Large number of flash distillation equals a differential distillation.
a) True
b) False
Answer: False
8. The equation applicable for batch distillation is _________
a) Frenske’s equation
b) Rayleigh equation
c) Wilke-chan equation
d) None of the mentioned
Answer: Rayleigh equation
9. The differential distillation in order to maintain the equilibrium the process should be slow.
a) True
b) False
Answer: True
10. Simple distillation is a___________ process.
a) Batch
b) Continuous
c) Adiabatic
d) None of the mentioned
Answer: Batch


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