Engineman (EN) A School Test 1 Practice Test

The pre-lubrication system primes the engine’s oil supply before cranking, so bearings are already bathed in oil and the lubrication circuit is pressurized smoothly as soon as the engine starts. This readiness prevents a sudden, uncontrolled buildup of oil pressure and reduces dry-start wear, keeping components well-lubricated from the first moment the engine turns over.

Starter interlock is about safe starting logic (disallows cranking in unsafe conditions), not lubrication. Pressure relief handles overpressure during operation, not pre-start priming. Flyweight limiter governs engine speed under load, not lubrication.