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Food Engineering
Food Engineering Multiple Choice
Quiz 1
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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
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