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Engine_2014 : Electricity - 1022/2299
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In comparison to a main switchboard for a DC electrical distribution system, a main switchboard for an AC electrical distribution system requires the useĀ  of which of the following devices, whereas a DC main switchboard does not?
A) Reverse power or current relays
B) Generator and load center circuit breakers
C) Frequency meter, power factor or reactive power meters, and synchronizing lamps or synchroscope
D) Voltage regulator and prime mover governor speed controls
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