1. Small Engine Principles of Operation Test

2. 1) ?
Downward movement of piston which permits fuel-air-mixture to enter cylinder.
Intake Valve is open, Exhaust valve is closed

3. 2) ? Upward movement of the piston which compresses fuel-air mixture
Both valves are closed

4. 3) ?
Downward piston movement caused by spark ignition of compressed fuel-air mixture
Both valves remain closed

5. 4) ? Upward piston movement which expels burnt gas from the cylinder
Exhaust valve opens releasing burnt gases from the cylinder

6. 5) ? I C P E