Practice question

In a four-stroke petrol engine, what is the exact position of the valves during the compression stroke?

  1. Intake valve is open, exhaust valve is closed
  2. Intake valve is closed, exhaust valve is open
  3. Both the intake and exhaust valves are closed
  4. Both the intake and exhaust valves are open

Answer: C — Both the intake and exhaust valves are closed

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