🔍 Key Concepts

• Follow the power path from each generator symbol through the labeled contactors to the motors. • Notice that A1 is associated with the gas turbine set and A2 with the auxiliary diesel set, while G1/G2 are tied to the main propulsion diesel generators feeding the propulsion armature loop. • Look carefully at how the bow thruster DC motor is connected relative to the A1/A2 contactors and how the main propulsion DC motors connect through G1/G2 and S1/S2.

💭 Think About

• With A1 and A2 dropped out, which generator sets are actually connected to anything downstream? Trace those open contacts on the diagram. • With G1 and G2 pulled in and S1 and S2 dropped out, which DC motors are still in the completed circuit, and which generator(s) are feeding that circuit? • Compare the resulting power paths with each answer choice: which option correctly describes who is feeding the main propulsion motors and who (if anyone) can still feed the bow thruster?

✅ Before You Answer

• Verify which generator(s) have a continuous electrical path to the main propulsion DC motors when G1 and G2 are closed and S1 and S2 are open. • Verify whether the bow thruster DC motor has any closed path back to a generator when both A1 and A2 contactors are open. • Eliminate any answer choice that mentions a generator supplying a load that your tracing shows is electrically isolated by an open contactor.