3 circuits that use inductive sensors?

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

Answer: (A)

Inductive sensors detect metal targets in close proximity by a change in inductance, so they’re ideal for tracking rotating metal parts or encoded metal patterns. When a metal gear tooth, encoder ring, or similar metal target passes by, the sensor output switches or changes in a predictable way, giving a pulse train or a steady signal that can be used to measure speed or determine angular position.

That’s why sensing generator speed and mainshaft speed fits well with inductive sensing—both involve rotating metal components whose teeth or encoder patterns produce regular metal targets for the sensor to read, enabling accurate speed measurements. Yaw position, which is an angular orientation around the vertical axis, can also be monitored with an inductive setup if there’s a metal-coded encoder or gear pattern rotating to create a readable position signal.

In contrast, the other options describe quantities that aren’t typically read with inductive proximity sensing: voltage, current, and power are electrical properties usually measured with electrical or Hall-effect sensors; humidity, temperature, and pressure are environmental or process variables measured with thermal, capacitive, or pressure-sensing devices; fuel level, oil pressure, and temperature involve fluid or thermal/pressure sensors rather than metallic proximity sensing.