单项选择题
A.internal heat it can withstand B.load it can carry continuously C.load it is capable of supplying D.overload it can carry for a specified time only
The frequency of the alternating current generated by a...
单项选择题The frequency of the alternating current generated by a synchronous generator is governed by the speed and the（）
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
