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Chemical Engineering Practice Test: Energy Balances that Include the Effects of Chemical Reaction, Ideal Processes, Efficiency and the Mechanical Energy Balance, Heats of Solution and Mixing
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Topics in this quiz include: Degrees of freedom and their analysis, energy balance applications, ideal reversible processes and their efficiency, mechanical energy balance, mixing effect into energy balance and heat of solution, dissolution and mixing.

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Chemical Engineering Practice Test: Energy Balances that Include the Effects of Chemical Reaction, Ideal Processes, Efficiency and the Mechanical Energy Balance, Heats of Solution and Mixing
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25 Questions

1. What is the reversible work done if 8 m3 of an ideal gas is compressed isothermally from 4 Pa to 16 Pa?
2. What is the heat transferred for an unsteady state closed system, if a change in enthalpy is 5 J, and change in pressure is 10 Pa at constant volume 5 m3?
3. What is the efficiency of the system, if the actual work output from the process is 15 J and work output for a reversible process is 20 J?
4. If the reactions are unknown, is it possible to determine the degrees of freedom?
5. A mixture contains 50% of A with Heat Capacity 10 J/oC and 50% of B with Heat Capacity 20 J/oC, what is the Heat Capacity of mixture?
6. What is the heat of solution in the energy balance?
7. Which of the following is required for the calculation of heat of reaction in the energy balance?
8. Which of the following allows complete conversion of mechanical energy?
9. What is the sensible heat of a reaction if the enthalpy of outputs is 15 J, and enthalpy of inputs is 5 J?
10. What is the coefficient of performance of a system, if its work input is 50 J and heat removed is 35 J?
11. What is the work done by saturated water which evaporates to 1 kPa atmosphere to form 2 m3 of water vapor?
12. If the temperature of the reaction is 25oC what will be the temperature of the products of the reaction for which theoretical flame temperature is defined?
13. What is the coefficient of performance of a system, if its work input is 75 J and heat removed is 45 J?
14. What is the heat evolved when a gaseous solute is mixed with liquid solvent?
15. What is the sensible heat of a reaction if the enthalpy of outputs is 5 J, and enthalpy of inputs is 10 J?
16. What is the enthalpy change of solution if the enthalpy change of solute is 10 J, and enthalpy of solvent is 15 J?
17. Which of the following is not an example of mechanical energy?
18. Which of the following does both of the reversible and irreversible processes involve?
19. What is the work done by 0.1 m3 saturated ethanol which evaporates to 10 kPa atmosphere to form 1 m3 of water vapor?
20. In a reactor two stream are entering, one with H2 at 10 atm and 27oC, and another with O2 at 10 atm and 0oC, producing H2O2, H2O, and O2 at 10 atm and 23oC, what are the total degrees of freedom?
21. Free expansion of gas against piston having friction is an example of which process?
22. In a reactor two stream are entering, one with S at 10 atm and 27oC, and another with O2 at 10 atm and 0oC, producing SO2, SO3, and O2 at 10 atm and 23oC, what are the total degrees of freedom?
23. Energy out and Energy in of a system are 10 J and 25 J respectively, what is the efficiency of the system?
24. A mixture contains 30% of A with Heat Capacity 10 J/oC, 30% of B with Heat Capacity 20 J/oC, and 40% of C with Heat Capacity 35 J/oC, what is the Heat Capacity of mixture?
25. What is the reversible work done if 4 m3 of an ideal gas is compressed adiabatically pV1.5 = K from 2 Pa to 16 Pa?

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