ATO Mission Computers Practice Test

Which voltage powers the ADF antenna drive motor?

115VAC 26VAC 28VDC 230VAC

Correct Answer:

115VAC

Explanation:

Aircraft electrical systems for avionics typically provide 115 VAC at 400 Hz to power motors and components. This high-frequency AC makes the power transformers lighter and the motors simpler and more compact, which is why the ADF antenna drive motor is designed to run from that source. The other options don’t fit the usual avionics power scheme: 28 VDC is used for some DC buses but the ADF drive is an AC motor, 26 VAC isn’t a standard aircraft supply, and 230 VAC isn’t the common avionics standard in this context. So the motor is powered by 115 VAC to match the aircraft’s normal avionics power distribution.

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