Practice question

During the compression stroke of a four-stroke engine, what is the state of the intake and exhaust valves?

  1. Both valves are open
  2. Both valves are closed while the piston moves upward, compressing the air-fuel mixture
  3. The intake valve is open and the exhaust valve is closed
  4. The exhaust valve is open and the intake valve is closed

Answer: B — Both valves are closed while the piston moves upward, compressing the air-fuel mixture

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