SAR-66 Module 16 Practice Questions - CAAS SAR-66 AML Module 16 - Piston Engine (MCQ) Exam

What is 'valve overlap' in an aircraft 4-stroke piston engine, and what benefit does it provide at high RPM?

The angular period near Top Dead Center (TDC) when both intake and exhaust valves are open simultaneously, utilizing exhaust gas inertia to draw in fresh intake charge The time when both intake and exhaust valves are completely closed during the power stroke The period when the intake valve is held open during the compression stroke to reduce starter torque The period when exhaust gas flows back into the carburetor

Correct Answer:

The angular period near Top Dead Center (TDC) when both intake and exhaust valves are open simultaneously, utilizing exhaust gas inertia to draw in fresh intake charge

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