Inductive sensors are used to measure which parameters in the listed circuits?

• A. Generator speed, Mainshaft speed, and Yaw position
• B. Temperature, Humidity, Pressure
• C. Voltage, Current, Frequency
• D. Fuel level, Oil pressure, Temperature

Answer: (A)

Inductive sensors detect metallic objects and disturbances in a magnetic field. When a metal part such as a gear tooth, a ferromagnetic ring, or a rotating shaft passes by the sensor, it changes the magnetic field and creates electrical pulses. By counting those pulses over time, you can determine rotational speed; by noting the timing of successive disturbances, you can infer the angular position. That makes them well-suited for tracking how fast the generator and main shaft are turning and for determining yaw position, which relies on knowing the orientation of a rotating metal reference relative to the sensor.

Temperature, humidity, and pressure require sensors that respond to thermal, moisture, or fluid pressure changes, not to metallic proximity. Voltage, current, and frequency are electrical quantities measured with devices designed for electrical signal sensing, not inductive proximity sensing. Fuel level, oil pressure, and temperature likewise rely on sensors appropriate for fluids and heat. So inductive sensing is best matched to measuring rotational speeds and the position of rotating metal parts.