An Otto cycle with the air-standard assumptions (cv=0.717 kJ/kg.K and cp/cv=1.4) has a compression ratio of 10. Before the isentropic compression process, the air is at 1xx kPa, 15°C, and 5yy cm?. The heat transfer to the air per cycle is 1zző kJ/kg. The angular speed of the crankshaft for the four-stroke engine is 2xx0 revolutions per minute. Determine (a) the thermal (first law) efficiency, (b) the second law efficiency, (c) the net specific power output of the cycle (in kJ/kg) (d) the mean effective pressure (MEP), (e) the horse power (hp) of the engine Note: You must draw P-V and T-s charts and mark processes to have a score Xx=04.vy=54.77=84

An Otto cycle with the air-standard assumptions (cv=0.717 kJ/kg.K and cp/cv=1.4) has a compression ratio of 10. Before the isentropic compression process, the air is at 1xx kPa, 15°C, and 5yy cm?. The heat transfer to the air per cycle is 1zző kJ/kg. The angular speed of the crankshaft for the four-stroke engine is 2xx0 revolutions per minute. Determine (a) the thermal (first law) efficiency, (b) the second law efficiency, (c) the net specific power output of the cycle (in kJ/kg) (d) the mean effective pressure (MEP), (e) the horse power (hp) of the engine Note: You must draw P-V and T-s charts and mark processes to have a score Xx=04.vy=54.77=84

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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Question

An Otto cycle with the air-standard assumptions (cv=0.717 kJ/kg.K and cp/cv=1.4) has a
compression ratio of 10. Before the isentropic compression process, the air is at 1xx kPa, 15°C,
and 5yy cm³. The heat transfer to the air per cycle is 1zz0 kJ/kg. The angular speed of the
crankshaft for the four-stroke engine is 2xx0 revolutions per minute. Determine
(a) the thermal (first law) efficiency,
(b) the second law efficiency,
(c) the net specific power output of the cycle (in kJ/kg)
(d) the mean effective pressure (MEP),
(e) the horse power (hp) of the engine
Note: You must draw P-V and T-s charts and mark processes to have a score
Xx=04, yy=54,zz=84

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