How many volts is the electrical system?

How many volts is the electrical system?

• A. 115VAC, 28VDC
• B. 230VAC, 28VDC
• C. 115VAC, 24VDC
• D. 110VAC, 28VDC

Answer: (A)

The question tests understanding that this electrical system uses two voltage rails: an AC supply around 115 volts and a DC rail around 28 volts. The 115 VAC is the typical line voltage that powers the system, while the 28 VDC rail is used for the control circuitry and electronics after conversion from the AC supply. This dual-voltage setup is common in many systems, where AC handles main power and DC provides a stable supply for logic and avionics. Why this pairing fits better than the others: 230 VAC is a regional standard outside North America, so it wouldn’t match the system described here. A DC rail of 24 VDC is a different standard used in other industries, not the one indicated. A value like 110 VAC is close to 115 VAC but not the specified nominal, and the question is about the intended pairing, not a rough approximation. The stated combination of 115 VAC and 28 VDC is the correct match for this system.

The question tests understanding that this electrical system uses two voltage rails: an AC supply around 115 volts and a DC rail around 28 volts. The 115 VAC is the typical line voltage that powers the system, while the 28 VDC rail is used for the control circuitry and electronics after conversion from the AC supply. This dual-voltage setup is common in many systems, where AC handles main power and DC provides a stable supply for logic and avionics.

Why this pairing fits better than the others: 230 VAC is a regional standard outside North America, so it wouldn’t match the system described here. A DC rail of 24 VDC is a different standard used in other industries, not the one indicated. A value like 110 VAC is close to 115 VAC but not the specified nominal, and the question is about the intended pairing, not a rough approximation. The stated combination of 115 VAC and 28 VDC is the correct match for this system.