单项选择题
A.full excitation B.load C.power factor D.number of poles
When two DC generators operate in parallel, they are pr...
单项选择题When two DC generators operate in parallel, they are protected against motorizing by（）
A.blow out coils B.governor relay C.under voltage trips D.reverse current trips
The correct phase rotation of a three-phase alternator ...
单项选择题The correct phase rotation of a three-phase alternator can be checked with a（）
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
