Chemical Process Calculation Questions and Ans

Question 1
Marks : +2 | -2
Pass Ratio : 100%
Amount of water vapor in the air increases as the dew point temperature ______________
Increases
Decreases
Remains same
None of the mentioned
Explanation:
Amount of water vapor in the air increases as the dew point temperature increases.
Question 2
Marks : +2 | -2
Pass Ratio : 100%
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?
0.1
0.2
0.3
0.4
Explanation:
Fraction of water vapor at 300 K and 1 atm pressure is 0.8/8 = 1.
Question 3
Marks : +2 | -2
Pass Ratio : 100%
________ is the change of vapour in a non-condensable gas.
Saturation
Vaporization
Condensation
None of the mentioned
Explanation:
Condensation is the change of vapour in a non-condensable gas.
Question 4
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Pass Ratio : 100%
In a vaporization process __________ changes to _________
Vapor, liquid
Vapor, solid
Solid, Vapor
Liquid, Vapor
Explanation:
In vaporization process liquid changes to vapor.
Question 5
Marks : +2 | -2
Pass Ratio : 100%
Vaporization starts at __________ point.
Dew point
Bubble point
Triple point
None of the mentioned
Explanation:
At Bubble point liquid starts evaporating which is the point at which vaporization starts.
Question 6
Marks : +2 | -2
Pass Ratio : 100%
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?
0.2
0.4
0.6
0.8
Explanation:
Fraction of water vapor at 127oC and 1 atm = 0.8*300/400 = 0.6.
Question 7
Marks : +2 | -2
Pass Ratio : 100%
Condensation starts ________ point.
Dew point
Bubble point
Triple point
None of the mentioned
Explanation:
Condensation starts Dew point.
Question 8
Marks : +2 | -2
Pass Ratio : 100%
Water changes into water vapour only when boiling occurs. The statement is
Correct
Incorrect
Always correct
None of the mentioned
Explanation:
In other operation as well water result in vapour.
Question 9
Marks : +2 | -2
Pass Ratio : 100%
When gas changes to liquid through the process of condensation, the temperature
Increases
Decreases
Remains constant
None of the mentioned
Explanation:
Temperature is constant during condensation.
Question 10
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Pass Ratio : 100%
When the air temperature rises, the saturation vapor pressure
Increases
Decreases
Remains same
None of the mentioned
Explanation:
When the air temperature rises, the saturation vapor pressure increases.