单项选择题
A.dynamometer B.power factor meter C.three-phase motor D.polyphase voltmeter
A probable cause for a turbo generator tripping out on ...
单项选择题A probable cause for a turbo generator tripping out on overspeed is a sudden（）
A.loss of field excitation B.total loss of load C.large increase in load D.loss of steam pressure
All of the following operating characteristics are list...
单项选择题All of the following operating characteristics are listed on the name-plates of motors used aboard ship except the（）
A.temperature rise B.input kilowatts C.horsepower D.operating voltage
When would you ground an electric hand tool?（）A.When it...
单项选择题When would you ground an electric hand tool?（）
A.When it is a DC machine B.When it is an AC machine C.Any machine that operates on over 100 volts D.Only when working on wet steel plates
