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ME103 Final Exam - Thermodynamics
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MCQs on Thermodynamics.

ME103 Final Exam - Thermodynamics
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25 Questions

1. Which of the following power cycles used for internal combustion consists of 2 adiabatic processes, 1 isochoric process, and 1 isobaric process?
2. What is a BTU?
3. Which of the following statements about exergy is true?
4. What is the change in entropy when 1 kmol gas at 10 bar and 300 K expands to a pressure at 1 bar? You can assume that the process is isothermal.
5. Calculate work done when 1 kmol of an ideal gas expanded isothermally at 600 K from 5 bar to 4 bar .
6. What is the boiling temperature of water at 4 MPa? (Hint: Use water-steam phase diagram shown here.)
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7. What are temperature and pressure of water at the triple point?
8. In a system, a water vapor mixture is at equilibrium at 200°C.What is the pressure of the system?
9. Consider an air-standard Otto cycle, which has a compression ratio of 6. Its temperature and pressure at the beginning of the compression process are 60.33°F and 14.2 lbf/in2, respectively. The heat addition per unit mass of air is 633 kJ. Calculate the thermal efficiency of the cycle.
10. Which of the following statements about the first law of thermodynamics is false?
11. How much work is required to accelerate a mass of 10 kg from 10 km/hr to 100 km/hr?
12. What is the power cycle that consists of 2 adiabatic processes and 2 isobaric processes?
13. A system contains water at 4 MPa and 300°C.What is the phase of this water?
14. Which of the following statements about Carnot power cycle is false?
15. Which of the following is the thermodynamic quantity that measures the degree of disorder in a system?
16. Consider a Carnot vapor power cycle using water as the working fluid.Saturated liquid enters the boiler at a pressure of 8 MPa, and saturated vapor enters the turbine.The pressure of the condenser pressure is 8 kPa.What is the thermal efficiency of this power cycle?
17. Which of the following statements about heat transfer is false?
18. Which of the following statements is ALWAYS true for an isothermal process of an ideal gas?
19. An ideal gas has a molecular weight of 10 kg/k-mole and a specific internal energy of 300 kJ/kg, when the temperature is 373°K.What is the specific enthalpy of this gas?
20. What is the thermodynamic efficiency of a heat engine that rejects heat at a rate of 20 MW when heat is supplied to it at a rate of 80 MW?
21. What are three major modes of heat transfer?
22. Which of the following processes is NOT a part of a four-stroke Otto power cycle?
23. A heat engine outputs 300 kW. It receives heat at a rate of 500 kW. The hot and cold temperatures are 2000 K and 300 K, respectively.Calculate the second-law efficiency of the heat engine.
24. An ideal gas is initially at 60°C and 4 kPa. It then undergoes isobaric expansion, which increases the volume of the gas from 1.6 m3 to 4 m3. What is the amount of work done by the gas in this process?
25. According to the first law of thermodynamics, what cannot be created or destroyed?

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