The ADF receives 3 different power supplies, what are they?

The ADF receives 3 different power supplies, what are they?

• A. 26 VDC, 28 VDC, & 115 VAC
• B. 12 VDC, 24 VDC, & 28 VAC
• C. 120 VAC, 240 VAC, & 28 VDC
• D. 28 VDC, 115 VAC, & 240 VAC

Answer: (A)

The question tests understanding that some avionics gear is designed to operate from two DC power rails and an AC input, providing flexibility for different power sources on the aircraft or from ground power. The ADF is specified to use two DC supplies—26 VDC and 28 VDC—for its internal electronics and subsystems, while also accepting a 115 VAC input from an AC power source. This combination lets the unit run directly from aircraft DC power or from AC power that is converted internally to the required rails. Other options mix in voltages that aren’t part of this device’s three-supply design (such as 12 VDC/24 VDC, or 28 VAC, or 120/240 VAC). The set with 26 VDC, 28 VDC, and 115 VAC matches the intended power configuration, ensuring the ADF can operate from the appropriate DC rails and an AC input.

The question tests understanding that some avionics gear is designed to operate from two DC power rails and an AC input, providing flexibility for different power sources on the aircraft or from ground power. The ADF is specified to use two DC supplies—26 VDC and 28 VDC—for its internal electronics and subsystems, while also accepting a 115 VAC input from an AC power source. This combination lets the unit run directly from aircraft DC power or from AC power that is converted internally to the required rails.

Other options mix in voltages that aren’t part of this device’s three-supply design (such as 12 VDC/24 VDC, or 28 VAC, or 120/240 VAC). The set with 26 VDC, 28 VDC, and 115 VAC matches the intended power configuration, ensuring the ADF can operate from the appropriate DC rails and an AC input.