On the marine gas turbine shown in the illustration, the gas generator speed sensor is located _________. Illustration GT-0017

Correct Answer: Option B — on the accessory gearbox

The gas generator speed sensor is mounted on the accessory gearbox, which is driven by the high-pressure compressor shaft. This location allows the sensor to accurately monitor the rotational speed of the gas generator core, providing essential feedback to the fuel control system for governing and protection logic.