Food Engineering Questions and Answers – Unit Operations – Equilibrium Stage Operations-2

This set of Food Engineering Multiple Choice Questions & Answers focuses on “Equilibrium Stage Operations-2”.

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
View Answer

2. In re-fluxing, the re-flux ratio needs to a minimum.
a) True
b) False
View Answer

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
View Answer

4. Statement 1: Bubble point means the feed is at saturated vapor.
Statement 2: Dew point means the feed is at boiling point.
a) True, False
b) True, True
c) False, False
d) False, True
View Answer

5. When q=(Heat required to convert one mole of feed to saturated vapor)/(Molar heat of vaporization of feed)
Statement 1: q<1 means the liquid is sub-cooled.
Statement 2: q<0 means the liquid is super heated vapor.
a) True, False
b) True, True
c) False, False
d) False, True
View Answer

6. When q=(Heat required to convert one mole of feed to saturated vapor)/(Molar heat of vaporization of feed)
Statement 1: q<1 means the slope is a horizontal line.
Statement 2: q<1 means the slope is a vertical line.
a) True, False
b) True, True
c) False, False
d) False, True
View Answer

7. With respect to ammonia-water system –
Statement 1: Limiting ratio is when the __(1)___ will meet __(2)__
Statement 2: When the flow rate of liquid is high, the distance between (1) and (2) decreases.
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
View Answer

8. ∫_y0^ybdy/(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
View Answer

9. Statement 1: Hydrogenation of fats involves liquid-gas phases only.
Statement 2: Hydrogenation of fats is known as slurry reactor system.
a) True, False
b) True, True
c) False, False
d) False, True
View Answer

10. Statement 1: Vapour-liquid-Equilibria is related to by a simple expression of Raoult’s law.
Statement 2: Raoult’s law is applicable to real gases.
a) True, False
b) True, True
c) False, False
d) False, True
View Answer

11. Raoult’s law is when mole fraction approaches zero and Henry’s law is applicable when concentration approaches zero.
a) True
b) False
View Answer

12. Ethanol-water mixture is a popular example of a mixture exhibiting the typical VLE curve.
a) True
b) False
View Answer

13. Statement 1: Boiling point concentration diagram plots y against x. (Mole fraction in gas and liquid phase respectively).
Statement 2: VLE curve plots y against x. (Mole fraction in gas and liquid phase respectively).
a) True, False
b) True, True
c) False, False
d) False, True
View Answer

14. Statement 1: Batch distillation is used for small capacity operations.
Statement 2: In food processing, batch distillation is used for desolventization.
a) True, False
b) True, True
c) False, False
d) False, True
View Answer

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
View Answer

Sanfoundry Global Education & Learning Series – Food Engineering.

To practice multiple choice questions in all areas of Food Engineering, here is complete set of 1000+ Multiple Choice Questions and Answers.

If you find a mistake in question / option / answer, kindly take a screenshot and email to [email protected]