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 use 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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