This set of Chemical Process Calculation Multiple Choice Questions & Answers (MCQs) focuses on “Saturation”.
1. Antoine equation is a relation between
a) Vapour pressure and partial pressure
b) Vapour pressure and Temperature
c) Vapour pressure and absolute pressure
d) None of the mentioned
View Answer
Explanation: Antoine equation is a relation between Vapour pressure and Temperature.
2. Correct representation of the Antoine equation is
a) ln(p*) = A-B/(C+T)
b) log(p*) = A-B/(C-T)
c) ln(p*) = A+B/(C+T)
d) log(p*) = A-B/(C+T)
Where: p* & T are Vapour pressure and Temperature respectively and A, B & C are constants.
View Answer
Explanation: ln(p*) = A-B/(C+T) is the correct representation of Antoine equation.
3. The temperature at which the vapour just start to condense at a specified pressure is
a) Critical temperature
b) Boiling point
c) Dew point
d) Triple point
View Answer
Explanation: The temperature at which the vapour just start to condense at a specified pressure is Dew point.
4. At dew point the partial pressure of the is equal to the partial pressure of the volatile liquid.
The above given statements is
a) Always correct
b) Incorrect
c) Depends on the properties of the liquid
d) None of the mentioned
View Answer
Explanation: At dew point the partial pressure of the is equal to the vapour pressure of the volatile liquid.
5-7. Assume water in air at 600 mm of Hg at 51 Degree Celsius. (Vapour pressure = 98 mm Hg)
5. What is the pressure of Air?
a) 502 mm Hg
b) 402 mm Hg
c) 302 mm Hg
d) 202 mm Hg
View Answer
Explanation: Pair = Ptotal – p*.
6. What is the composition of vapour?
a) 0.163
b) 0.183
c) 0.2837
d) 0.8367
View Answer
Explanation: yH2O = 98/600.
7. What is the composition of vapour?
a) 0.163
b) 0.183
c) 0.2837
d) 0.8367
View Answer
Explanation: yAir = 502/600.
8. Dew point of water at standard conditions is?
a) 100 K
b) 273 K
c) 373 K
d) 473 K
View Answer
Explanation: Dew point of water at standard condition = 100 Degree Celsius.
9-10. Water vapour of 5 KPa at 300 K is saturated with air in a system.
9. What is the mole fraction of air?
a) 0.952
b) 0852
c) 0.259
d) 0.291
View Answer
Explanation: Mole fraction of air = 101.3/(5 + 101.3) = 0.952.
10. What is the mole fraction of vapour?
a) 0.047
b) 0.057
c) 0.067
d) 0.077
View Answer
Explanation: Mole fraction of air = 5/(5 + 101.3) = 0.047.
Sanfoundry Global Education & Learning Series – Chemical Process Calculation.
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