What is the role of the ignition exciter in the ignition system?

• A. To regulate fuel pressure.
• B. To measure spark duration.
• C. To lubricate the ignition spark plug.
• D. To generate the high voltage pulses that energize the igniters to initiate and sustain ignition.

Answer: (D)

The ignition exciter supplies the energy to create the spark that starts and sustains ignition. It converts electrical power into high-voltage pulses that travel through the ignition leads to the igniter plugs in the combustor. Those rapid, high-voltage pulses produce a spark across the plug gap, delivering the energy needed to ignite the fuel–air mixture at the correct time and sustain ignition during start or relight attempts. It’s not involved in regulating fuel pressure, lubricating the plugs, or measuring spark duration, which is why the other options don’t fit.