单项选择题
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
点击查看答案&解析
相关考题
-
单项选择题
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 -
单项选择题
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 -
单项选择题
The sub-multiple prefix “nano” (n) means （）.
A.thousandth (10 to the-3rd power)
B.millionth (10 to the-6th power)
C.billionth (10 to the-9th power)
D.trillionth (10 to the-12th power)
