Chemical Process Calculation Questions and Ans

Question 1
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 2
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 3
Marks : +2 | -2
Pass Ratio : 100%
When vapour is compressed isothermally the ____________ changes.
Volume
Pressure
Temperature
None of the mentioned
Explanation:
When vapour is compressed isothermally the volume changes.
Question 4
Marks : +2 | -2
Pass Ratio : 100%
Vaporization temperature of water at standard conditions is _______________ Degree Celsius.
100
200
300
400
Explanation:
Vaporization temperature of water at standard conditions is 100 Degree Celsius.
Question 5
Marks : +2 | -2
Pass Ratio : 100%
If the fraction of water vapour at 127 Degree Celsius and 1 atm is 0.5, what is the fraction of water vapour at 27 Degree C and 1 atm?
0.275
0.375
0.475
0.875
Explanation:
Fraction = 0.5*300/400 = 0.375.
Question 6
Marks : +2 | -2
Pass Ratio : 100%
When the air temperature rises the saturation mixing ratio
Increases
Decreases
Remains same
None of the mentioned
Explanation:
When the air temperature rises the saturation mixing ratio increases.
Question 7
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 8
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 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
Marks : +2 | -2
Pass Ratio : 100%
In a condensation process, _______ to _________
Gas, Solid
Gas, Liquid
Liquid, Gas
Liquid, Solid
Explanation:
In a condensation process, Gas to Liquid.