單項(xiàng)選擇題

A generator is prevented from becoming motorized by the use of a/an （）.

A.over-speed trip
B.reverse power relay
C.back pressure trip
D.governor controls

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單項(xiàng)選擇題

Which of the electrical properties listed will always be the same for each component in a parallel circuit?（）

A.Impedance
B.Current
C.Resistance
D.Voltage

單項(xiàng)選擇題

A switchboard, for a AC electrical distribution system, will be provided with which of the following components （）.

A.Frequency meter
B.Ammeter
C.Voltmeter
D.All of the above