USCG Exam PracticeDiesel engine principles (motor propulsion)
In a four-stroke diesel engine, what is the correct sequence of piston strokes beginning with intake?
- ✓ Intake, compression, power, exhaustCorrect
- B. Intake, power, compression, exhaust
- C. Compression, intake, power, exhaust
- D. Intake, compression, exhaust, power
Why A is correct
The four-stroke cycle proceeds intake, compression, power, exhaust over two crankshaft revolutions. Fuel is injected at or just before top dead center on the compression stroke, and the exhaust valve opens on the fourth stroke to expel spent gases. (DOE-HDBK-1018 Vol.1 §1-1)
Cited:DOE-HDBK-1018 Vol.1 §1-1