Which power source supplies pump 3B?

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Multiple Choice

Which power source supplies pump 3B?

Explanation:
The key idea is redundancy in how a hydraulic pump is powered. Pump 3B is designed to be an electrically driven pump that can receive power from more than one source. It can be powered by the air-driven generator (ADG) as part of the emergency electrical system, and it can also be powered by AC Bus 1 during normal operation. This dual-source capability ensures hydraulic pressure for critical systems even if one power source fails, which is why the correct answer states it is powered by both ADG and AC Bus 1. Engine-driven pumps powers other hydraulic pumps (like 1 and 2), so this pump isn’t engine-driven.

The key idea is redundancy in how a hydraulic pump is powered. Pump 3B is designed to be an electrically driven pump that can receive power from more than one source. It can be powered by the air-driven generator (ADG) as part of the emergency electrical system, and it can also be powered by AC Bus 1 during normal operation. This dual-source capability ensures hydraulic pressure for critical systems even if one power source fails, which is why the correct answer states it is powered by both ADG and AC Bus 1. Engine-driven pumps powers other hydraulic pumps (like 1 and 2), so this pump isn’t engine-driven.

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