# Separation Processes Questions and Answers – Multicomponent Flash, Bubble Point and Dew Point Calculations

This set of Separation Processes Assessment Questions and Answers focuses on “Multicomponent Flash, Bubble Point and Dew Point Calculations”.

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

Explanation: A flash is a single-equilibrium stage distillation where the feed is partially vaporized to give a vapor feed rich in more volatile components.

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

Explanation: Unless the relative volatility is high, flashing is not a replacement for distillation.

3. What is the condition for phase equilibrium?
a) Pv=PL
b) TV=TL
c) yi=kixi
d) Fzi=Vyi + Lxi

Explanation: The correct equation for phase equilibrium isyi=kixi.

4. What is the condition for thermal equilibrium?
a) Pv=PL
b) TV=TL
c) yi=kixi
d) Fzi=Vyi + Lxi

Explanation: The correct equation for thermal equilibrium is TV=TL.

5. What is the condition for mechanical equilibrium?
a) Pv=PL
b) TV=TL
c) yi=kixi
d) Fzi=Vyi + Lxi

Explanation: The correct equation for mechanical equilibrium is Pv=PL.
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6. What is the equation for component material balance?
a) Pv=PL
b) TV=TL
c) yi=kixi
d) Fzi=Vyi + Lxi

Explanation: The correct equation for component material balance isFzi=Vyi + Lxii.

7. What is the equation for total energy balance?
a) Pv=PL
b) F=V + L
c) yi=kixi
d) Fzi=Vyi + Lxi

Explanation: The correct equation for total energy balance is F= V + L.

8. What is the dew point quation?
a) ∑ ziki=0
b) ∑ zi/ki=0
c) ∑ ziki=1
d) ∑ zi/ki=1

Explanation: The dew point equation is∑ zi/ki=1.

9. What is the bubble point equation?
a) ∑ ziki=0
b) ∑ zi/ki=0
c) ∑ ziki=1
d) ∑ zi/ki=1

Explanation: The dew point equation is∑ zi/ki=1.

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

Explanation: Whenever there is a vapor-liquid equilibrium, the vapor is at its dew point and the liquid is at its bubble point.

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