单项选择题
A.current flow in a circuit B.voltage between two points in a circuit C.circuit continuity D.power
The instantaneous reduction in voltage of an AC generat...
单项选择题The instantaneous reduction in voltage of an AC generator, resulting from an increase in load, and prior to the automatic voltage regulator correcting the situation, is called voltage （）.
A.droop B.drop C.dip D.regulation
If both the “high level” and “low level” alarms come on...
单项选择题If both the “high level” and “low level” alarms come on for the same address of a centralized control console, the most likely problem is a/an （）.
A.sensor failure B.failed alarm C.low level D.extremely high level
For practical purposes, in a simple series circuit, the...
单项选择题For practical purposes, in a simple series circuit, the source voltage will be dropped across one resistor if it has（）.
A.half the resistance of the other resistor B.a resistance equal to the other C.at least ten times the resistance of the other D.a partial short circuit
