Large commercial aircraft use this type of current as its primary form of power.

Large commercial aircraft use this type of current as its primary form of power.

• A. DC power
• B. Battery power
• C. AC power
• D. Pulsating DC

Answer: (C)

Large commercial aircraft rely on alternating current as their primary form of power. Engine-driven generators provide three‑phase AC, typically at 400 Hz, to feed the main electrical buses. This AC distribution allows lighter, smaller transformers and motors, which is crucial for aircraft efficiency. DC power and batteries are used for specific systems and as backups, but they’re not the primary source for the main electrical system. Pulsating DC isn’t used as the primary power because it would cause unacceptable voltage variation for most loads.

Large commercial aircraft rely on alternating current as their primary form of power. Engine-driven generators provide three‑phase AC, typically at 400 Hz, to feed the main electrical buses. This AC distribution allows lighter, smaller transformers and motors, which is crucial for aircraft efficiency. DC power and batteries are used for specific systems and as backups, but they’re not the primary source for the main electrical system. Pulsating DC isn’t used as the primary power because it would cause unacceptable voltage variation for most loads.