Electric igniters used on modern marine gas...

🔍 Key Concepts

• Ignition systems on gas turbine engines typically use a transformer to step up voltage from ship’s power to a much higher secondary voltage at the igniter plug. • Compare the voltage ranges of typical ship service power (115/440 VAC) to the much higher voltages needed to jump an air gap in a high-pressure combustor. • Think about how the required spark intensity in a gas turbine combustor compares to that of a gasoline engine spark plug (often around 20,000–40,000 volts).

💭 Think About

• Which of the answer ranges looks like normal shipboard supply voltage, and which look like transformed, high-voltage ignition output? • To reliably jump an air gap in a high-pressure, high-velocity airflow inside the combustor, would you expect a relatively low voltage or a very high voltage at the igniter? • Among the high-voltage options, which range seems more realistic for a durable marine ignition system that must fire repeatedly without destroying the igniter?.

✅ Before You Answer

• Eliminate any options that match standard ship service power (115 or 440 VAC), since the question asks for secondary voltage at the igniter, not supply voltage. • Focus on the options that represent a stepped‑up ignition voltage capable of producing a strong arc in the combustor. • Before choosing, ask whether the voltage is so extremely high that it would likely cause rapid erosion or breakdown of the igniter instead of reliable service.

Electric igniters used on modern marine gas turbine engines, commonly operate on a secondary voltage of _________. Illustration GT-0017

115 to 440 volts AC

450 to 1000 volts AC

10,000 to 20,000 volts AC

50,000 to 100,000 volts AC

🔍 Key Concepts

💭 Think About

✅ Before You Answer