Which component supplies DC power to the DC system immediately after engine start?

Which component supplies DC power to the DC system immediately after engine start?

• A. Battery charging alternator
• B. Starter motor
• C. Main alternator
• D. External battery pack

Answer: (A)

Immediately after engine start, the DC system needs a source of power while the main generator comes up to speed. The battery charging alternator serves this role by providing DC power to the DC distribution and simultaneously charging the battery. It acts as a transitional source that keeps the DC system powered right after start, until the main alternator takes over as the primary power source. The starter motor draws from the battery to start the engine, but once the engine is running, power to the DC bus is maintained by the charging alternator, not by the starter or by an external pack in normal operation.

Immediately after engine start, the DC system needs a source of power while the main generator comes up to speed. The battery charging alternator serves this role by providing DC power to the DC distribution and simultaneously charging the battery. It acts as a transitional source that keeps the DC system powered right after start, until the main alternator takes over as the primary power source. The starter motor draws from the battery to start the engine, but once the engine is running, power to the DC bus is maintained by the charging alternator, not by the starter or by an external pack in normal operation.