How is electrical power distributed by the generators on the 737?

How is electrical power distributed by the generators on the 737?

• A. All three generators supply power to the Synch Bus; if only one generator is online, it provides 100% of the power; if two online, they share 50% each.
• B. Each generator runs independently with no sharing.
• C. The Synch Bus is powered by an external GPU only.
• D. Each generator powers a separate bus; loads do not share.

Answer: (A)

The main idea is that the 737’s onboard generators operate in parallel on a common distribution point called the Synch Bus, so power is shared automatically among them. With all three generators online, they contribute to the Synch Bus in a balanced way. If only one generator is online, it must carry the entire load. If two are online, they share the load roughly equally, and if all three are online, the load is divided about a third each. This arrangement provides redundancy and stable electrical power; the generator control systems automatically regulate voltage and frequency while distributing the load. On the ground, a GPU can supply power, but in normal operation the three onboard generators share power through the Synch Bus rather than each feeding a separate, isolated bus. The other options imply no sharing or separate buses, which isn’t how the 737 electrical system is designed to work.

The main idea is that the 737’s onboard generators operate in parallel on a common distribution point called the Synch Bus, so power is shared automatically among them. With all three generators online, they contribute to the Synch Bus in a balanced way. If only one generator is online, it must carry the entire load. If two are online, they share the load roughly equally, and if all three are online, the load is divided about a third each. This arrangement provides redundancy and stable electrical power; the generator control systems automatically regulate voltage and frequency while distributing the load. On the ground, a GPU can supply power, but in normal operation the three onboard generators share power through the Synch Bus rather than each feeding a separate, isolated bus. The other options imply no sharing or separate buses, which isn’t how the 737 electrical system is designed to work.