Q.1
Which of the following is a process/method to enhance the amount of pure distillate?
  • a) Rectification
  • b) Stripping
  • c) Re-fluxing
  • d) All of the mentioned
Q.2
In re-fluxing, the re-flux ratio needs to a minimum.
  • a) True
  • b) False
Q.3
The feed line tells us that a particular feed A is at a sub-cooled liquid. Which of the following explains the above statement?
  • a) The liquid is at its boiling point
  • b) None of the mentioned
  • c) A liquid below its boiling temperature
  • d) The liquid is a mixture of boiling and some vapors
Q.4
StatementBubble point means the feed is at saturated vapor.
  • a) True, False
  • b) True, True
  • c) False, False
  • d) False, True
Q.5
When q=(Heat required to convert one mole of feed to saturated vapor)/(Molar heat of vaporization of feed)
  • a) True, False
  • b) True, True
  • c) False, False
  • d) False, True
Q.6
When q=(Heat required to convert one mole of feed to saturated vapor)/(Molar heat of vaporization of feed)
  • a) True, False
  • b) True, True
  • c) False, False
  • d) False, True
Q.7
With respect to ammonia-water system –
  • a) Operating line will meet Equilibrium curve, false
  • b) Equilibrium curve will meet Equilibrium line, true
  • c) Operating line will meet Equilibrium line, true
  • d) All of the mentioned
Q.8
∫y0ybdy/(y-y*) gives you _____
  • a) Height of one transfer unit
  • b) Height of the entire column
  • c) Number of transfer units in the column
  • d) None of the mentioned
Q.9
StatementHydrogenation of fats involves liquid-gas phases only.
  • a) True, False
  • b) True, True
  • c) False, False
  • d) False, True
Q.10
StatementVapour-liquid-Equilibria is related to by a simple expression of Raoult’s law.
  • a) True, False
  • b) True, True
  • c) False, False
  • d) False, True
Q.11
Raoult’s law is when mole fraction approaches zero and Henry’s law is applicable when concentration approaches zero.
  • a) True
  • b) False
Q.12
Ethanol-water mixture is a popular example of a mixture exhibiting the typical VLE curve.
  • a) True
  • b) False
Q.13
StatementBoiling point concentration diagram plots y against x. (Mole fraction in gas and liquid phase respectively).
  • a) True, False
  • b) True, True
  • c) False, False
  • d) False, True
Q.14
StatementBatch distillation is used for small capacity operations.
  • a) True, False
  • b) True, True
  • c) False, False
  • d) False, True
Q.15
When a system doesn’t obey Raoult’s law, the relative volatility is the ratio of the Henry’s constants for the two systems.
  • a) True
  • b) False
0 h : 0 m : 1 s