The power output from a spark ignition engine is varied by

1.	The power output from a spark ignition engine is varied by
A.	Changing the ignition timing
B.	Regulating the amount of air-fuel inducted
C.	Regulating the amount of air fuel mixture
D.	Regulating the amount of fuel
Answer» D. Regulating the amount of fuel

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The power output from a spark ignition engine is varied by

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