3. (a) A 3200c.c. Spark Ignition (SI) V6 engine operates on a four stroke cycle at 7800RPM. The engine compression ratio is 9.2, the length of the connecting rod is 15.6cm, and the engine has a bore/stroke ratio of 1.7. At this speed, combustion ends at 34° ATDC. Calculate: i Cylinder bore and stroke length. ii Average piston speed iii Clearance volume of one cylinder. (b) The same engine is connected to a dynamometer which gives a brake output torque reading of 175Nm at 7800 RPM. At this speed, air enters the cylinders at 80kPa and 65°C, and the me- chanical efficiency of the engine is 80%. Calculate: i Brake power ii Indicated power iii Brake mean effective pressure iv Indicated mean effective pressure v Friction mean effective pressure vi Power lost to friction.

3. (a) A 3200c.c. Spark Ignition (SI) V6 engine operates on a four stroke cycle at 7800RPM. The engine compression ratio is 9.2, the length of the connecting rod is 15.6cm, and the engine has a bore/stroke ratio of 1.7. At this speed, combustion ends at 34° ATDC. Calculate: i Cylinder bore and stroke length. ii Average piston speed iii Clearance volume of one cylinder. (b) The same engine is connected to a dynamometer which gives a brake output torque reading of 175Nm at 7800 RPM. At this speed, air enters the cylinders at 80kPa and 65°C, and the me- chanical efficiency of the engine is 80%. Calculate: i Brake power ii Indicated power iii Brake mean effective pressure iv Indicated mean effective pressure v Friction mean effective pressure vi Power lost to friction.

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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