Question 156Gas Turbine - Assistant Engineer

The correct answer is B) The gas generator rotor fails to reach a preset RPM after the starting motor has been energized for a preset interval. This is because during the auto-start sequence of a gas turbine engine, the engine control system monitors the gas generator rotor speed. If the gas generator rotor does not reach a preset RPM within a specified time after the starting motor is energized, the system will register a "False Start" indication. This indicates that the engine has failed to start properly and requires further troubleshooting. The other options are incorrect because they do not accurately describe the specific condition that triggers a "False Start" indication during the auto-start sequence. Option A is incorrect as it refers to the power turbine, not the gas generator rotor. Options C and D are also incorrect as they do not involve the gas generator rotor speed during the initial start-up phase.