In a four-stroke cycle, how many strokes are involved in one complete cycle?

In a four-stroke engine cycle, one complete cycle consists of four distinct strokes: intake, compression, power, and exhaust. Each stroke represents a different phase of the engine's operation.

1. The intake stroke draws in the air-fuel mixture into the combustion chamber as the piston moves down.

2. The compression stroke compresses this mixture by moving the piston back up, increasing the pressure and temperature, which is crucial for ignition.

3. The power stroke occurs when the spark plug ignites the compressed fuel-air mixture, causing a rapid expansion of gases that pushes the piston down and generates power.

4. Finally, the exhaust stroke expels the burnt gases from the chamber as the piston moves back up again.

This sequence of four strokes is essential for the engine’s operation and efficiency, allowing it to perform the work necessary to power a vehicle or machine. Thus, one complete cycle in a four-stroke engine is accurately represented by four strokes, making that choice the correct answer.