Chemical Process Calculation Questions and Ans

Question 1
Marks : +2 | -2
Pass Ratio : 100%
Most heat energy is required in the following process?
Sublimation
Evaporation
Condensation
None of the mentioned
Explanation:
Sublimation needs more energy than evaporation and condensation.
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%
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 4
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 5
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Pass Ratio : 100%
When the vapour is condensed at constant system pressure, the pressure changes.
Correct statement
Incorrect statement
Can`t say anything
None of the mentioned
Explanation:
When the vapour is condensed at constant system pressure, the pressure changes.
Question 6
Marks : +2 | -2
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 7
Marks : +2 | -2
Pass Ratio : 100%
When vapour is cooled at constant total system volume, the _______ changes.
Volume
Pressure
Temperature
None of the mentioned
Explanation:
When vapour is cooled at constant total system volume, the pressure changes.
Question 8
Marks : +2 | -2
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.
Question 9
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 10
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.