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4. Two and one-half pounds of air actuate a cycle composed of the following processes: polytropic compression 1-2, with n= 1.5; constant pressure 2-3; constant volume 3-1. The known data are: p, = 20 psia, t, = 100°F, Q, =-1682 Btu. Determine (a) T, and T, (b) the work of the cycle using the pV plane, in Btu; (c) Q, (d) the thermal efficiency, and (e) pm' %3D %3D Ans. (a) 1120°R, 4485°R; (b) 384.4 Btu; (c) 2067 Btu; (d) 18.60%; (e) 106.8 psi

4. Two and one-half pounds of air actuate a cycle composed of the following processes: polytropic compression 1-2, with n= 1.5; constant pressure 2-3; constant volume 3-1. The known data are: p, = 20 psia, t, = 100°F, Q, =-1682 Btu. Determine (a) T, and T, (b) the work of the cycle using the pV plane, in Btu; (c) Q, (d) the thermal efficiency, and (e) pm' %3D %3D Ans. (a) 1120°R, 4485°R; (b) 384.4 Btu; (c) 2067 Btu; (d) 18.60%; (e) 106.8 psi

Elements Of Electromagnetics
Elements Of Electromagnetics
7th Edition
ISBN:9780190698614
Author:Sadiku, Matthew N. O.
Publisher:Sadiku, Matthew N. O.
ChapterMA: Math Assessment
Section: Chapter Questions
Problem 1.1MA
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4. Two and one-half pounds of air actuate a cycle composed of the following processes: polytropic compression 1-2, withn= 1.5; constant pressure 2-3; constant volume 3-1. The known data are: p, = 20 psia, t, = 100°F, Q, = -1682 Btu. Determine (a) T, and T, (b) the work of the cycle using the pV plane, in Btu; (c) Q, (d) the thermal efficiency, and (e) pm· 3 Ans. (a) 1120°R, 4485°R; (b) 384.4 Btu; (c) 2067 Btu; (d) 18.60%; (e) 106.8 psi
Transcribed Image Text:4. Two and one-half pounds of air actuate a cycle composed of the following processes: polytropic compression 1-2, withn= 1.5; constant pressure 2-3; constant volume 3-1. The known data are: p, = 20 psia, t, = 100°F, Q, = -1682 Btu. Determine (a) T, and T, (b) the work of the cycle using the pV plane, in Btu; (c) Q, (d) the thermal efficiency, and (e) pm· 3 Ans. (a) 1120°R, 4485°R; (b) 384.4 Btu; (c) 2067 Btu; (d) 18.60%; (e) 106.8 psi
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