Which component closes to allow the remaining generator to power both AC systems after a generator failure?

Which component closes to allow the remaining generator to power both AC systems after a generator failure?

• A. Auto Xfer relays
• B. DC bus tie
• C. Engine fuel valve
• D. APU bleed valve

Answer: (A)

Automatic transfer relays control how AC power is shared when a generator fails. They automatically close to tie the remaining generator to both AC buses, so both systems stay powered by the live generator. The DC bus tie handles DC power, and the engine fuel valve plus APU bleed valve aren’t involved in reconfiguring AC power distribution, so they wouldn’t accomplish this transfer.

Automatic transfer relays control how AC power is shared when a generator fails. They automatically close to tie the remaining generator to both AC buses, so both systems stay powered by the live generator. The DC bus tie handles DC power, and the engine fuel valve plus APU bleed valve aren’t involved in reconfiguring AC power distribution, so they wouldn’t accomplish this transfer.