What are the strokes of a four-stroke engine?

• A. Intake, Compression, Combustion, Exhaust
• B. Intake, Ignition, Power, Exhaust
• C. Inlet, Compression, Power, Exhaust
• D. Intake, Compression, Power, Exhaust

Answer: (D)

The four-stroke engine cycle has four piston movements in this order: intake, compression, power, exhaust. During intake the air-fuel mixture is drawn into the cylinder. In compression, the mixture is squeezed to 높은 pressure and temperature with both valves closed. The power stroke follows, where the mixture is ignited and burns, and the resulting high-pressure gases push the piston downward to produce power. Finally, exhaust opens the exhaust valve and the burnt gases are expelled as the piston moves up. This naming and order are standard, which is why the sequence using Intake, Compression, Power, Exhaust is the correct choice. Terms like Inlet or Ignition describe parts or processes within the cycle, but they don’t match the conventional stroke names or their exact order.