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Thermodynamics II :
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Thermodynamics II :
Thermodynamics II :
QUIZ #4 [15 Points] Chapter 9 Gas Power Systems - Analyzing the Otto Cycle The air temperature in the piston-cylinder at the beginning of the adiabatic compression process of an ideal Air Standard Otto cycle with a compression ration of 8 is 540°R, the pressure is 1.0 atm. The maximum temperature during the cycle is 3600°R. Assume the expansion and compression processes are adiabatic and that kinetic and potential energy effects are negligible. P-v Process Diagram T-s Process Diagram State 1 2 3 4 1. 2. 3. 5. u [Btu/lb] C. 379.2 d. 495.2 92.0 211.3 C. 510.1 d. 673.8 721.4 342.2 h [Btu/lb] 129.1 294.4 The cycle expansion work output in tu/lb is a. 119.3 b. 165.3 C. 379.2 d. 495.2 968.2 The cycle compression work input in Btu/lb is a. 119.3 b. 165.3 473.0 C. 77% d. cannot be determined. The thermal energy input to the working fluid in Btu/lb is a. 250.2 b. 343.9 4. The net thermal energy for the cycle in Btu/lb is a. 119.3 b. 259.9 b. 390.9 c. 510.1 The thermal efficiency of the cycle is a. 23% b. 51%
QUIZ #4 [15 Points] Chapter 9 Gas Power Systems - Analyzing the Otto Cycle The air temperature in the piston-cylinder at the beginning of the adiabatic compression process of an ideal Air Standard Otto cycle with a compression ration of 8 is 540°R, the pressure is 1.0 atm. The maximum temperature during the cycle is 3600°R. Assume the expansion and compression processes are adiabatic and that kinetic and potential energy effects are negligible. P-v Process Diagram T-s Process Diagram State 1 2 3 4 1. 2. 3. 5. u [Btu/lb] C. 379.2 d. 495.2 92.0 211.3 C. 510.1 d. 673.8 721.4 342.2 h [Btu/lb] 129.1 294.4 The cycle expansion work output in tu/lb is a. 119.3 b. 165.3 C. 379.2 d. 495.2 968.2 The cycle compression work input in Btu/lb is a. 119.3 b. 165.3 473.0 C. 77% d. cannot be determined. The thermal energy input to the working fluid in Btu/lb is a. 250.2 b. 343.9 4. The net thermal energy for the cycle in Btu/lb is a. 119.3 b. 259.9 b. 390.9 c. 510.1 The thermal efficiency of the cycle is a. 23% b. 51%