Chemical Process Calculation Questions and Answers – Vaporization

This set of Chemical Process Calculation Multiple Choice Questions & Answers (MCQs) focuses on “Vaporization”.

1. In a vaporization process __________ changes to _________
a) Vapor, liquid
b) Vapor, solid
c) Solid, Vapor
d) Liquid, Vapor
View Answer

Answer: d
Explanation: In vaporization process liquid changes to vapor.

2. Vaporization starts at __________ point.
a) Dew point
b) Bubble point
c) Triple point
d) None of the mentioned
View Answer

Answer: b
Explanation: At Bubble point liquid starts evaporating which is the point at which vaporization starts.

3. Heating a liquid at constant pressure can definitely cause____________
a) Vaporization
b) Condensation
c) Boiling
d) None of the mentioned
View Answer

Answer: a
Explanation: Heating a liquid at constant pressure can definitely cause Vaporization.
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4. Vaporization temperature of water at standard conditions is _______________ Degree Celsius.
a) 100
b) 200
c) 300
d) 400
View Answer

Answer: a
Explanation: Vaporization temperature of water at standard conditions is 100 Degree Celsius.

5. Amount of water vapor in the air increases as the dew point temperature ______________
a) Increases
b) Decreases
c) Remains same
d) None of the mentioned
View Answer

Answer: a
Explanation: Amount of water vapor in the air increases as the dew point temperature increases.
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6. When the air temperature rises, the saturation vapor pressure
a) Increases
b) Decreases
c) Remains same
d) None of the mentioned
View Answer

Answer: a
Explanation: When the air temperature rises, the saturation vapor pressure increases.

7. When the air temperature rises the saturation mixing ratio
a) Increases
b) Decreases
c) Remains same
d) None of the mentioned
View Answer

Answer: a
Explanation: When the air temperature rises the saturation mixing ratio increases.
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8. Most heat energy is required in the following process?
a) Sublimation
b) Evaporation
c) Condensation
d) None of the mentioned
View Answer

Answer: a
Explanation: Sublimation needs more energy than evaporation and condensation.

9. The fraction of water vapor at 300 K and 8 atm is 0.8. Calculate the fraction of water vapor at the same temperature and 1 atm pressure?
a) 0.1
b) 0.2
c) 0.3
d) 0.4
View Answer

Answer: a
Explanation: Fraction of water vapor at 300 K and 1 atm pressure is 0.8/8 = 1.
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10. What is the fraction of water vapor at 300 K and 1 atm, if the fraction of water vapor at the same pressure is 0.8 and temperature is 400 K?
a) 0.2
b) 0.4
c) 0.6
d) 0.8
View Answer

Answer: c
Explanation: Fraction of water vapor at 127oC and 1 atm = 0.8*300/400 = 0.6.

Sanfoundry Global Education & Learning Series – Chemical Process Calculation.
To practice all areas of Chemical Process Calculation, 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]

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Manish Bhojasia - Founder & CTO at Sanfoundry
Manish Bhojasia, a technology veteran with 20+ years @ Cisco & Wipro, is Founder and CTO at Sanfoundry. He lives in Bangalore, and focuses on development of Linux Kernel, SAN Technologies, Advanced C, Data Structures & Alogrithms. Stay connected with him at LinkedIn.

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