Q.1
What is a flash?
  • a) It is a single-equilibrium stage distillation where the feed is partially vaporized to give a vapor feed rich in more volatile components.
  • b) It is a double-equilibrium stage distillation where the feed is partially vaporized to give a vapor feed rich in more volatile components
  • c) It is a single-equilibrium stage distillation where the feed is completely vaporized to give a vapor feed rich in more volatile components
  • d) It is a single-equilibrium stage distillation where the feed is partially vaporized to give a vapor feed rich in less volatile components
Q.2
When is flashing a replacement for distillation?
  • a) When the relative velocity is high
  • b) When the relative velocity is low
  • c) When the relative volatility is high
  • d) When the relative volatility is low
Q.3
What is the condition for phase equilibrium?
  • a) Pv=PL
  • b) TV=TL
  • c) yi=kixi
  • d) Fzi=Vyi + Lxi
Q.4
What is the condition for thermal equilibrium?
  • a) Pv=PL
  • b) TV=TL
  • c) yi=kixi
  • d) Fzi=Vyi + Lxi
Q.5
What is the condition for mechanical equilibrium?
  • a) Pv=PL
  • b) TV=TL
  • c) yi=kixi
  • d) Fzi=Vyi + Lxi
Q.6
What is the equation for component material balance?
  • a) Pv=PL
  • b) TV=TL
  • c) yi=kixi
  • d) Fzi=Vyi + Lxi
Q.7
What is the equation for total energy balance?
  • a) Pv=PL
  • b) F=V + L
  • c) yi=kixi
  • d) Fzi=Vyi + Lxi
Q.8
What is the dew point quation?
  • a) ∑ ziki=0
  • b) ∑ zi/ki=0
  • c) ∑ ziki=1
  • d) ∑ zi/ki=1
Q.9
What is the bubble point equation?
  • a) ∑ ziki=0
  • b) ∑ zi/ki=0
  • c) ∑ ziki=1
  • d) ∑ zi/ki=1
Q.10
What is true about vapor- liquid equilibrium?
  • a) Vapor is at its dew point and liquid at its bubble point
  • b) Vapor at its bubble point and liquid at its dew point
  • c) Both the liquid and vapor at dew point
  • d) Both the liquid and vapor at bubble point
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