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Aircraft systems and instrumentsQuestion 580 of 934

In a four-stroke engine, which stroke begins when the intake valve closes and the piston moves back to the top of the cylinder?

  1. The intake stroke, with the intake valve open
  2. The compression stroke
  3. The power stroke, with both valves closed
  4. The exhaust stroke, with the exhaust valve open
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Correct answer: The compression stroke

The compression stroke begins when the intake valve closes. The piston moves up and prepares the mixture for ignition.

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

Practice aircraft systems and instruments

Questions last reviewed: 18 October 2026