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

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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

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

单项选择题

Which is a function of the voltage regulators used with AC generators?（）

A.To cut out generators when they are no longer required
B.To cut in additional generators automatically as required
C.To divide the KW load equally between generators operating in parallel
D.To divide reactive current between generators operating in parallel