In a four-stroke internal combustion engine, spark ignition occurs when the piston reaches the top of the cylinder. Arrange the four engine strokes in the correct chronological order, starting immediately after ignition occurs.
- 1Power stroke: Expanding combustion gases drive the piston downward from top dead center (TDC) to bottom dead center (BDC) with both valves closed.
- 2Exhaust stroke: The piston rises from BDC to TDC while the exhaust valve opens to force out spent combustion gases.
- 3Intake stroke: The piston moves downward from TDC to BDC while the intake valve opens to draw in a fresh air-fuel mixture.
- 4Compression stroke: The piston moves upward from BDC to TDC with both valves closed, compressing the air-fuel mixture.
Answer
Power stroke, followed by Exhaust stroke, then Intake stroke, and finally Compression stroke.
A four-stroke internal combustion engine operates in a continuous sequence: intake, compression, power, and exhaust. When starting immediately after the air-fuel mixture is ignited at top dead center, the resulting expansion initiates the power stroke. Once the piston reaches bottom dead center, it moves upward during the exhaust stroke to expel burned gases. At the top of the exhaust stroke, the intake stroke commences as the piston moves downward to pull in fresh charge. Finally, the compression stroke pushes the piston upward to squeeze the charge before the next cycle begins.
Step-by-Step Solution
Key Concept
Four-Stroke Cycle Operation and Valve Sequencing
Estimated Time:1m 0s