Final answer:
The waste spark ignition system fires cylinders on exhaust and compression strokes in a four-stroke internal combustion engine.
Explanation:
The waste spark ignition system fires cylinders on the exhaust and compression strokes. In a four-stroke internal combustion engine, the exhaust stroke expels the burned air-gas mixture from the previous cycle, and the compression stroke compresses the fresh air-fuel mixture, preparing it for combustion.
During the power stroke, the air-fuel mixture is ignited, leading to a rapid increase in pressure and the piston descends, with the gas doing work by exerting a force. After the power stroke, the exhaust stroke expels the hot gas to begin a new cycle again.
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