On most marine gas turbines used aboard ships, vibration sensors are identified as _________.

Correct Answer: Option D — accelerometers

Accelerometers are the primary sensors used for monitoring gas turbine vibration. They measure the rate of change of velocity, providing a high-frequency response necessary to detect bearing wear, blade damage, or rotor imbalance. These sensors convert mechanical vibrations into electrical signals for real-time analysis by the engine monitoring system.