Aircraft systems and instrumentsQuestion 581 of 934

In a four-stroke engine, which stroke begins when the fuel-air mixture is ignited?

  1. The compression stroke
  2. The exhaust stroke
  3. The power stroke
  4. The intake stroke
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Correct answer: The power stroke

The ignition causes a tremendous pressure increase. This forces the piston down and turns the crankshaft.

Source: Pilot's Handbook of Aeronautical Knowledge (FAA-H-8083-25C), Chapter 7: Aircraft Systems — Reciprocating Engines, page 163

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Questions last reviewed: 18 October 2026