ANAC GMP Theoretical Exam (Powerplant Group) Practice Questions - ANAC Aircraft Maintenance Mechanic Certification Exam - Powerplant Group (GMP RBAC 65) Exam

What is the purpose of valve overlap in a four-stroke reciprocating aircraft engine?

To allow both valves to remain closed during the entire compression stroke To improve cylinder scavenging and volumetric efficiency using exhaust gas velocity To prevent ignition spark from firing until the piston reaches top dead center To lock the hydraulic lifter mechanism during high engine RPM operation

Correct Answer:

To improve cylinder scavenging and volumetric efficiency using exhaust gas velocity

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