What voltage levels are provided by the UH-60M's main AC generators?

What voltage levels are provided by the UH-60M's main AC generators?

• A. 24 Volt DC
• B. 115/200 Volt
• C. 440 Volt
• D. 12 Volt

Answer: (B)

The main concept here is understanding the airframe’s electrical power output. The UH-60M’s main AC generators deliver 115/200 VAC as a three-phase, 400 Hz system. This means each phase-to-neutral voltage is 115 V, and the line-to-line voltage is 200 V. This AC setup powers the avionics and electrical buses efficiently with a lighter, higher-frequency system. Why the other options don’t fit: those values are DC voltages or an unrealistically high AC level for helicopter systems. 24 V DC and 12 V DC come from batteries or DC converters, not the main AC generators. 440 V isn’t used in standard helicopter electrical architectures. So the 115/200 V figure correctly reflects the main AC generator output.

The main concept here is understanding the airframe’s electrical power output. The UH-60M’s main AC generators deliver 115/200 VAC as a three-phase, 400 Hz system. This means each phase-to-neutral voltage is 115 V, and the line-to-line voltage is 200 V. This AC setup powers the avionics and electrical buses efficiently with a lighter, higher-frequency system.

Why the other options don’t fit: those values are DC voltages or an unrealistically high AC level for helicopter systems. 24 V DC and 12 V DC come from batteries or DC converters, not the main AC generators. 440 V isn’t used in standard helicopter electrical architectures. So the 115/200 V figure correctly reflects the main AC generator output.