With the fuel selector switch in the left-hand position and power applied to the bus, which switches will move?

With the fuel selector switch in the left-hand position and power applied to the bus, which switches will move?

• A. 1, 2
• B. 5, 6, 11, 12, 13, 15, 16
• C. 7, 8, 9
• D. 10, 14

Answer: (B)

The situation tests how power distribution and a selector affect which circuits are energized and, in turn, which switches actuate. When power is applied to the bus and the fuel selector is in the left-hand position, the left-side fuel circuits are fed. Any switches on the panel that are driven by or connected to those left-side circuits will move as the electrical path is established and the mechanism is energized. The switches that are tied to the left-fuel system—namely the ones numbered 5, 6, 11, 12, 13, 15, and 16—will move, because they are part of that left-side feed. The other groups correspond to circuits that aren’t energized by the left-hand selection, so they stay put. This is why that set of switches is the correct choice.

The situation tests how power distribution and a selector affect which circuits are energized and, in turn, which switches actuate. When power is applied to the bus and the fuel selector is in the left-hand position, the left-side fuel circuits are fed. Any switches on the panel that are driven by or connected to those left-side circuits will move as the electrical path is established and the mechanism is energized. The switches that are tied to the left-fuel system—namely the ones numbered 5, 6, 11, 12, 13, 15, and 16—will move, because they are part of that left-side feed. The other groups correspond to circuits that aren’t energized by the left-hand selection, so they stay put. This is why that set of switches is the correct choice.