单项选择题

An ohmmeter can be used to measure（）

A.current flow in a circuit
B.voltage between two points in a circuit
C.circuit continuity
D.power

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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

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
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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