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
点击查看答案&解析
相关考题
-
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 -
单项选择题
The most inefficient method of voltage reduction from the stand point of power loss, is a/an （）
A.capacitor in series with the load
B.inductor in series with the load
C.capacitor and inductor in series with the load
D.resistor in series with the load
