Louisiana FFA CDE Small Motor Practice Test 2025 – Complete Exam Prep

Question: 1 / 400

In a four-cycle single cylinder engine, how often does a power stroke occur in relation to the crankshaft revolutions?

Every revolution

Every other revolution

In a four-cycle single cylinder engine, the power stroke occurs once every two revolutions of the crankshaft. This is because a four-cycle engine has four distinct strokes in its cycle: intake, compression, power, and exhaust. These four strokes correspond to two complete revolutions of the crankshaft.

During the first revolution, the engine completes the intake and compression strokes. Then, during the second revolution, it executes the power stroke followed by the exhaust stroke. As a result, the power stroke is produced once for every two revolutions of the crankshaft, making the correct response to this question 'every other revolution.' Understanding the timing of these strokes is crucial for its operation and efficiency.

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Every three revolutions

Every fourth revolution

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