An ideal Otto engine receives air at 100 kPa and 25°C. Work is performed on the air in order to raise the pressure at the end of the compression process to 1378 kPa. 400 kJ/kg of heat is added to the air during the heating process. Determine (A) the work done during the compression process, (B) the compression ratio, (C) the work done during the expansion process, (D) the heat removed from the air during the cooling process, (E) the MEP (mean effective pressure), and (F) the thermal efficiency of the cycle. [ANSWERS: (A) -238.5 kJ/kg, (B) 6.51, (C) 449.4 kJ/kg, (D) -189.0 kJ/kg, (E) 291.6 kPa, (F) 52.74%]

An ideal Otto engine receives air at 100 kPa and 25°C. Work is performed on the air in order to raise the pressure at the end of the compression process to 1378 kPa. 400 kJ/kg of heat is added to the air during the heating process. Determine (A) the work done during the compression process, (B) the compression ratio, (C) the work done during the expansion process, (D) the heat removed from the air during the cooling process, (E) the MEP (mean effective pressure), and (F) the thermal efficiency of the cycle. [ANSWERS: (A) -238.5 kJ/kg, (B) 6.51, (C) 449.4 kJ/kg, (D) -189.0 kJ/kg, (E) 291.6 kPa, (F) 52.74%]

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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