What are the three basic components of a typical engine ignition system?

• A. Ball bearings, roller bearings, main engine bearings
• B. Exciter assemblies, high tension leads, igniter plugs
• C. Labyrinth seals, thread seals, carbon seals
• D. Main engine bearings, accessory bearings, ball bearings

Answer: (B)

Engine ignition systems work by delivering a precise high-voltage spark to ignite the fuel-air mixture. The three basic components that make this happen are exciter assemblies, high tension leads, and igniter plugs. The exciter assemblies generate and time the spark, providing the necessary electrical signal. The high tension leads carry that high voltage from the exciter to each plug. The igniter plugs are the devices that actually produce the spark inside the combustion chamber. Other options refer to mechanical parts like bearings or seals, which aren’t part of the ignition path.