The above shown system is a typical AC or DC system? 26V AC Bus powered by trans

Question

The above shown system is a typical AC or DC system? 26V AC Bus powered by transformer TR 1. Which bus supplies TR1? Which TRU powers the battery bus? Which TRU powers DC bus 1? Which contactor are dosed to supply Gen Bus 1 with external power? Which contactor are closed to supply Gen Bus 1 with APU power? The transfer relay 2 is in position ALT. Which bus supplies TRU 2 with AC power? The transfer relay 1 is in position Off. Which TRU supplies DC Bus 1? TRU 2 is defect. Which TRU supplies DC bus 2? TR 2 is used to produce?

Explanation / Answer

Relay 2 are closed to supply Gen bus 1 with APU power..

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