AG Mechanics CDE Practice Exam

What is the correct order of the strokes in a 4-stroke cycle engine?

1. compression, intake, exhaust, power

2. exhaust, intake, compression, power

3. intake, compression, power, exhaust

4. power, intake, compression, exhaust

The correct answer is: compression, intake, exhaust, power

In a 4-stroke cycle engine, the correct order of strokes is compression, intake, power, and then exhaust. Here's why this order is correct: 1. Compression: The piston moves up to compress the air-fuel mixture in the cylinder before the spark plug ignites it. 2. Intake: After reaching the top of the compression stroke, the intake valve opens, and the piston moves down to allow the air-fuel mixture into the cylinder. 3. Power: The spark plug ignites the compressed air-fuel mixture, causing an explosion that drives the piston down, generating power. 4. Exhaust: Finally, the exhaust valve opens, and the piston moves up to push the exhaust gases out of the cylinder. This order ensures the efficient operation of the engine by carrying out each stroke in a specific sequence to complete a full combustion cycle.