Separation Processes Questions and Answers – Stage Efficiency and Column Height for Trayed Columns

This set of Separation Processes test focuses on “Stage Efficiency and Column Height for Trayed Columns”.

1. When it is not assumed that the vapor and liquid leaving a stage are not at same temperature?
a) When pressure changes from stage to stage
b) When temperature changes from stage to stage
c) When concentration of solute changes from stage to stage
d) When concentration of vapor changes from stage to stage
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2. To determine the actual number of required plates for a trayed column, what must be used?
a) K values
b) Process efficiency
c) Stage efficiency
d) Equilibrium between vapor and liquid
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3. What is the formula for overall stage efficiency given by lewis?
a) E _o = N_t /N _a
b) E_o = N_t N _a
c) E_o = N_t -N _a
d) E_o = N_t +N _a
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4. The overall stage efficiency is not a complex function of which of the following?
a) Geometry and design of contacting trays
b) Flow rates and flow paths for liquid and vapor phases
c) Compositions and properties of vapor and liquid phases
d) Material of the tray used
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5. What is the height added above the top tray to remove the entrained liquid?
a) 2ft
b) 4ft
c) 6ft
d) 8ft
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6. What is the height added below the bottom tray for bottom surge capacity?
a) 4ft
b) 6ft
c) 8ft
d) 10ft
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7. When are the columns in series preferred?
a) If the estimated height is above 100ft
b) If the estimated height Is above 150ft
c) If the estimated height is above 250ft
d) If the number of trays are less
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8. What is the tallest column in the world?
a) 240ft
b) 248ft
c) 300ft
d) 338ft
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9. What are the actual numbers of required plates when the overall stage efficiency is 0.8 and the calculated equilibrium stages are 4?
a) 2
b) 3
c) 5
d) 7
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10. What are the actual numbers of required plates when the overall stage efficiency is 0.9 and the calculated equilibrium stages are 9?
a) 12
b) 11
c) 5
d) 10
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11. What are the actual numbers of required plates when the overall stage efficiency is 0.7 and the calculated equilibrium stages are 2.8?
a) 2
b) 4
c) 5
d) 7
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12. What are the actual numbers of required plates when the overall stage efficiency is 0.6 and the calculated equilibrium stages are 4.8?
a) 8
b) 3
c) 5
d) 7
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13. What is the overall stage efficiency if the calculated equilibrium stages are 8 and the actual plates required are 12?
a) 0.75
b) 0.6
c) 0.56
d) 0.12
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14. What is the overall stage efficiency if the calculated equilibrium stages are 9 and the actual plates required are 11?
a) 0.75
b) 0.82
c) 0.56
d) 0.12
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15. What is the overall stage efficiency if the calculated equilibrium stages are 7 and the actual plates required are 13?
a) 0.75
b) 0.6
c) 0.54
d) 0.12
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Sanfoundry Global Education & Learning Series – Separation Processes.

To practice all areas of Separation Processes for tests, here is complete set of 1000+ Multiple Choice Questions and Answers.

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