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Chemical Engineering Practice Test: Humidity Charts & their Use, Analysis of the Degrees of Freedom in a Steady – State Process, Solving Material and Energy Balances Using Process and Unsteady State Material and Energy Balances
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Topics include: Humidity chart and its applications, energy balances using process simulators, degrees of freedom analysis and steady and unsteady state materials.

A psychrometric chart, also known as a hygrometry chart, is a graphical representation of the thermo-physical properties of a gaseous-vapor mixture. It's a tool that helps users understand the relationships between the various parameters of supply air and the relative humidity.

Chemical Engineering Practice Test: Humidity Charts & their Use, Analysis of the Degrees of Freedom in a Steady – State Process, Solving Material and Energy Balances Using Process and Unsteady State Material and Energy Balances
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25 Questions

1. Which of the following is also called adiabatic cooling?
2. In the humidity chart, what does the horizontal axis represent?
3. Humidity chart relates which of the following balances?
4. What is the humid volume of the system at 100oF with humidity 20%?
5. What is the enthalpy change of 15oC system if the heat capacity of air at 20oC is 10 J/oC and heat capacity of water vapor at 20oC is 20 J/oC, enthalpy of vaporization is 20 J, and the humidity is 50%?
6. Wet-bulb temperature is based on the equilibrium between rates of energy transfer to the bulb and which of the following?
7. What is the humidity at the point of intersection of the dew point curve and wet-bulb line?
8. What is the specific humidity, if pressure of water is 5 atm and total pressure is 10 atm?
9. What are the number of equations associated with 2 process stream, if the number of species in the stream are 3?
10. What is the humid heat of a mixture of air (CP = 10 J) with water vapor (CP = 15 J), if the humidity is 40%?
11. Enthalpy of air is 20 J and enthalpy of water vapor is 6 J, if the total enthalpy of the system is 23 J, what is the humidity of the system?
12. What is the humid heat of a mixture of air (CP = 10 J) with water vapor (CP = 15 J), if the humidity is 60%?
13. The humidity at dry-bulb temperature of 23oC is 30% and the humidity at dry-bulb temperature of 28oC is 25%, what is the slope of adiabatic cooling line?
14. What is the humid heat of a mixture of air (CP = 20 J) with water vapor (CP = 30 J), if the humidity is 40%?
15. For solving a process simulation which of the following is required?
16. Enthalpy of air is 10 J and enthalpy of water vapor is 15 J, if the total enthalpy of the system is 25 J, what is the humidity of the system?
17. In air conditioning process, what has to be done first to the moist air?
18. What are the number of equations associated with 3 process stream, if the number of species in the stream are 2?
19. The input mass in a process simulator is 10 Kg, what will be the output mass?
20. The feed of a process simulator is 10 J, the heat input is 5 J, and the work performed is 3 J, what will be the product enthalpy?
21. Degrees of freedom calculation treat which kind of variables?
22. What does the interconnections between the unit modules represent?
23. What is the enthalpy change of 30oC system if the heat capacity of air at 38oC is 5 J/oC and heat capacity of water vapor at 38oC is 10 J/oC, enthalpy of vaporization is 10 J, and the humidity is 60%?
24. Enthalpy of air is 5 J and enthalpy of water vapor is 10 J, if the total enthalpy of the system is 25 J, what is the humidity of the system?
25. The humidity at dry-bulb temperature of 20oC is 12% and the humidity at dry-bulb temperature of 23oC is 3%, what is the slope of adiabatic cooling line?

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