Which of the following is NOT a stroke in the four-stroke engine cycle?

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Multiple Choice

Which of the following is NOT a stroke in the four-stroke engine cycle?

Explanation:
The four-stroke cycle is defined by four piston movements: intake, compression, power, and exhaust. Ignition isn’t a piston movement; it’s the moment when the air–fuel charge is ignited to start combustion. In a spark-ignition engine, the spark plug fires near the end of the compression stroke to ignite the mixture, and the resulting rapid expansion drives the piston through the power stroke. In a diesel engine, ignition happens due to high compression heat, still an event rather than a separate stroke. So ignition isn’t a stroke in the cycle, making it the correct choice.

The four-stroke cycle is defined by four piston movements: intake, compression, power, and exhaust. Ignition isn’t a piston movement; it’s the moment when the air–fuel charge is ignited to start combustion. In a spark-ignition engine, the spark plug fires near the end of the compression stroke to ignite the mixture, and the resulting rapid expansion drives the piston through the power stroke. In a diesel engine, ignition happens due to high compression heat, still an event rather than a separate stroke. So ignition isn’t a stroke in the cycle, making it the correct choice.

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