One mole feed of a binary mixture of a given composition is flash vaporised at a fixed P and T. If Raoult's law is obeyed, then changing the feed composition would effect

A The product composition but not the fraction vaporised
B The product composition as well as the fraction vaporised
C The fraction vaporised but not the product composition
D Neither the product composition nor the fraction vaporised

Correct Answer: The fraction vaporised but not the product composition

Bissoy MCQ
#Chemical Engineering #Mass Transfer

Related Questions

কক্ষ তাপমাত্রায় 1.0 mole এসিটিক এসিড এবং 1.0 mole ইথানলকে মিশ্রিত করা হলো। সাম্যবস্থায় 0.667 mole এসিটিক এসিড ক্রিয়ায় অংশগ্রহণ করলে তার ke এর মান 4.00 হয়। কত মোল এষ্টার উৎপাদিত হবে যদি একই তাপমাত্রায় 4.0 mole এসিড এবং 2.0 mole ইথানাল নেয়া হয়।
A 0.333
B 0.667
C 6.0
D 2.0
The number of kg vaporised per kg of steam fed to the evaporator is defined as
A Capacity
B Rate of evaporation
C Economy
D Rate of vaporisation
Henry's law is closely obeyed by a gas, when its __________ is extremely high.
A Pressure
B Solubility
C Temperature
D None of these
Roult's law is obeyed by a __________ solution.
A Saturated
B Molar
C Normal
D None of these
On moving the feed line (q-line) from saturated liquid feed (vertical position) to saturated vapor feed (horizontal feed), if the slope of both the operating lines are to be increased, then it will result in
A Greater degree of separation with a fixed number of trays
B Increased reboiler load
C Increased reflux ratio
D None of these
The effect of changing the evaporator temperature on COP as compared to that of changing the condenser temperature (in vapour compression refrigeration system) is
A Less pronounced
B More pronounced
C Equal
D Data insufficient, can't be predicted
A jar contains a mixture of oil and water in the ratio 22 :3 . 50 litres of the mixture was taken out and 25 litres of water was added to it. If water was 34% in the resultant mixture, what was the initial quantity of the mixture (in litres ) in the jar?
A 175
B 150
C 75
D 125
A mixture contains 2/5 of element A and 3/5 of element B. When 5ml of A is added to the mixture, the proportion of B in the mixture changes to 1/5. What amount of A was originally present in the mixture before the addition was made ?
A 1ml
B 1.5ml
C 2.5ml
D 6ml
A backward feed multiple effect evaporator is better than forward feed for concentrating cold feed, because it provides
A Higher economy
B Lower capacity
C Both A & B
D Lower economy
If f = moles of vapour present per mole of feed, then the slope of feed line is (Mcabe-Thiele method)
A $$\frac{{1 - {\text{f}}}}{{\text{f}}}$$
B $$ - \frac{{{\text{f}} - 1}}{{\text{f}}}$$
C $$ - \frac{1}{{\text{f}}}$$
D $$ - \frac{{\text{f}}}{{1 - {\text{f}}}}$$

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