(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. 1
(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. 1
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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please send handwritten solution Q3 part b vi
Transcribed Image Text: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.
Im
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