Practice Test Geeks(UAS) Unmanned Aircraft Systems Certified Practice Test
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Technical Skills and Training Flashcards

7 cards from real UAS practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.

Read the first 7 Technical Skills and Training flashcards as text

  1. A UAS pilot observes that the drone is drifting consistently to the left during a GPS-hold hover. What is the most likely cause?

    Answer: IMU or accelerometer calibration error causing a tilt bias

    An uncalibrated IMU or accelerometer can cause the flight controller to perceive a false tilt, leading the drone to drift in the direction of the bias.

  2. What is the primary advantage of using brushless motors over brushed motors in UAS applications?

    Answer: Brushless motors have longer lifespan and higher efficiency due to no physical brush contact

    Brushless motors eliminate the friction and wear of physical brush contacts, resulting in higher efficiency, longer operational life, and greater reliability.

  3. What is the recommended LiPo battery storage voltage per cell when a drone will not be flown for more than a few days?

    Answer: 3.80–3.85V (storage voltage)

    Storing LiPo cells at 3.80–3.85V per cell minimizes chemical stress and prolongs battery lifespan; storing fully charged or fully discharged accelerates degradation.

  4. In fixed-wing UAS, what control surface primarily controls roll?

    Answer: Aileron

    Ailerons, located on the outer trailing edge of each wing, deflect in opposite directions to create differential lift, rolling the aircraft left or right.

  5. What does a UAS pilot mean when they perform a 'stick calibration' of the remote controller?

    Answer: Mapping the full mechanical travel of each stick axis so the flight controller interprets input correctly

    Stick calibration records the minimum, center, and maximum positions of each control axis so the flight controller can accurately interpret pilot inputs across the full range of motion.

  6. What is 'hot-swapping' batteries on a UAS, and why is it generally discouraged?

    Answer: Replacing a battery without powering the drone off; discouraged because it can cause voltage spikes damaging the flight controller

    Disconnecting and reconnecting a battery while the drone remains powered can cause voltage spikes or current surges that damage ESCs, the flight controller, or other electronics.

  7. Which of the following best describes 'motor KV rating' in UAS propulsion?

    Answer: The number of RPM the motor produces per volt of input with no load

    KV rating expresses how many RPM a motor turns per volt applied under no-load conditions; higher KV motors spin faster with smaller props, while lower KV motors turn larger props more efficiently.