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Refer to figure.
If GEN 1 fails, can AC BUS 1 still be fed?

  • A

    Yes, from AC BUS 2, provided contactors C2-2 and C2-1 are closed.

  • B

    Yes, via the AC ESS BUS and contactor C3-1.

  • C

    Yes, through DC BUS 1, contactor C5-1, and TRU 1.

  • D

    No, AC BUS 1 can only be powered by GEN 1.

Refer to figure. 
AC BUS 1 can be fed by GEN 2, when the contactors C1.4, C2.2, and C2.1 are closed.

Yes, via the AC ESS BUS and contactor C3-1 → INCORRECT. The AC ESS BUS does not supply power. It only receives power, so it cannot supply power to AC BUS 1.

Yes, through DC BUS 1, contactor C5-1, and TRU 1 → INCORRECT. The TRU unit only provides power conversion from AC to DC. It cannot be used to supply power from DC BUS 1 to AC BUS 1.

No, AC BUS 1 can only be powered by GEN 1 → INCORRECT. AC BUS 1 can be supplied by AC BUS 2 and GEN 2 if contactors C2-2, C2-1, and C1-4 are closed.

 

 

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