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

What is the primary function of piston rings installed on aircraft reciprocating engine pistons?

To seal combustion chamber pressure and control cylinder wall oil lubrication To connect the piston directly to the crankshaft journal pin To equalize gas pressure between adjacent cylinders during valve overlap To reduce thermal expansion of the aluminum piston crown

Correct Answer:

To seal combustion chamber pressure and control cylinder wall oil lubrication

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