Which instrument is used to measure angular accelerations around pitch, roll, and yaw axes?

• A. Accelerometer
• B. Gyroscope
• C. Barometer
• D. Altimeter

Answer: (B)

Measuring how fast the aircraft rotates around its three axes is essential for stabilization, and that data comes from a gyroscope. A gyroscope provides angular velocity readings for pitch, roll, and yaw, telling the flight controller how quickly the drone is turning about each axis. This rotational-rate information is what the autopilot uses (often in combination with accelerometer data) to estimate orientation and make timely adjustments to keep the drone stable and responsive. While an accelerometer tracks linear motion and gravity, and barometers/altimeters track altitude, those sensors don’t tell you about rotation. That rotational information is what the gyroscope supplies.