Which engine acts as the master during synchronization?

• A. Right engine
• B. Left engine
• C. Neither, synchronization is automatic
• D. Both engines are masters

Answer: (D)

When two engines are synchronized, the goal is to keep their speeds matched to prevent vibration and uneven loading. The synchronization system doesn’t lock to a single fixed reference; it uses a bidirectional control that can designate either engine as the lead at any moment. In practice, the faster engine becomes the reference and the other engine follows, but if conditions change, the master role can switch. This dynamic, two-way control means both engines can act as masters depending on current conditions, ensuring quick, smooth convergence of speeds.

So the best answer is that both engines are masters. This avoids the rigidity of a fixed master and explains why the system can adapt as engine speeds change.