This set of Basic Chemical Engineering Multiple Choice Questions & Answers (MCQs) focuses on “Partial Saturation Terminology”.
1. Which of the following is defined as the ratio of partial pressure and vapor pressure?
a) Relative Humidity
b) Molal Humidity
c) Humidity
d) None of the mentioned
View answer
Explanation: Partial pressure divided by vapor pressure is called relative humidity.
2. What is the relative saturation of a gas with partial pressure 10 mm Hg and vapor pressure 5 mm Hg?
a) 0.5
b) 1
c) 2
d) 4
View answer
Explanation: Relative saturation = 10/5 = 2.
3. What is the relative humidity of a gas with a partial pressure of water vapor is 5 mm Hg and vapor pressure 8 mm Hg?
a) 25%
b) 32.5%
c) 45%
d) 62.5%
View answer
Explanation: Relative humidity = 5/8*100 = 62.5%.
4. What is the relative saturation of a gas with partial pressure 38 mm Hg and vapor pressure 1 torr?
a) 0.05
b) 0.5
c) 2
d) 38
View answer
Explanation: 1 torr = 1 mm Hg, => relative saturation = 38/1 = 38.
5. What is the relative humidity of a gas with a partial pressure of water vapor 360 Pa and vapor pressure 1 atm?
a) 100%
b) 225.1%
c) 355.4%
d) 405.9%
View answer
Explanation: Relative humidity = 360/101.3*100 = 355.4%.
6. What is called the ratio of partial pressure of vapor and partial pressure of the dry gas?
a) Humidity
b) Relative humidity
c) Molal humidity
d) None of the mentioned
View answer
Explanation: Partial pressure of vapor divided by the partial pressure of vapor free gas is called molal humidity.
7. What is the molal humidity of a gas with pressure of gas vapor 10 mm Hg and pressure of vapor free gas 20 mm Hg?
a) 25%
b) 50%
c) 100%
d) 200%
View answer
Explanation: Molal humidity = 10/20*100 = 50%.
8. What is the molal saturation of a gas with 10 moles of gas vapor and 25 moles of dry gas?
a) 0.2
b) 0.4
c) 0.8
d) 1
View answer
Explanation: Molal saturation = 10/25 = 0.4.
9. What is the molal saturation of a gas with 10 Pa partial pressure without vapor and 0.5 atm partial pressure with vapor?
a) 0.5
b) 1
c) 5
d) 101.3
View answer
Explanation: Molal saturation = 0.5*101.3/10 = 5.
10. What is the molal humidity of a gas with partial pressure with vapor 1 mm Hg and partial pressure without vapor 1 atm?
a) 90%
b) 131%
c) 214%
d) 288%
View answer
Explanation: Molal humidity = 133.3/101.3*100 = 131%.
11. Which of the following is equal to the product of humidity and mass of dry gas?
a) Moles of water vapor
b) Mass of water vapor
c) Mass of gas vapor
d) None of the mentioned
View answer
Explanation: Humidity = (mass of water vapor)/(mass of dry gas).
12. What is the humidity, if the mass of dry gas is 10 Kg and mass of water vapor is 5 Kg?
a) 25%
b) 50%
c) 100%
d) 200%
View answer
Explanation: Humidity = 5/10*100 = 50%.
13. What is the mass of water vapor, if the mass of dry gas is 10 lb and humidity 10%?
a) 254 g
b) 453 g
c) 746 g
d) 1 Kg
View answer
Explanation: Mass of water vapor = 10*0.1 = 1 lb = 453 g.
14. What is the humidity if the moles of dry gas is 25 and mole of water vapor are 15?
a) 60%
b) 90%
c) 150%
d) 200%
View answer
Explanation: Humidity = 15/25*100 = 60%.
15. What are moles of dry gas if the moles of water vapor is 14 at 25% humidity?
a) 3.5
b) 7
c) 14
d) 56
View answer
Explanation: Moles of dry gas = 14/0.25 = 56.
Sanfoundry Global Education & Learning Series – Basic Chemical Engineering.
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