What function do facility batteries provide during normal operating conditions (commercial alternate current [AC] power available)?
a. They generate direct current (DC) power and run the switch.
b. They act as a DC filter for the commercial AC power.
c. They rectify the commercial AC to DC and power the system.
d. They serve no function unless commercial power is disconnected.
Ans: b. They act as a DC filter for the commercial AC power.
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