单项选择题
A.frequency B.number of phases C.phase rotation D.All of the above
A DC generator is used to supply direct current in orde...
单项选择题A DC generator is used to supply direct current in order to maintain an AC generator field and is known as a/an （）
A.rotor B.stator C.exciter D.armature
The unit "hertz" is equivalent to （）A.coulombs per seco...
单项选择题The unit "hertz" is equivalent to （）
A.coulombs per second B.revolutions per second C.revolutions per minute D.cycles per second
When paralleling two AC generators, the frequency of th...
单项选择题When paralleling two AC generators, the frequency of the machine coming on-line, immediately prior to closing its breaker, should be （）
A.slightly less than the oncoming generator frequency B.the same as the bus frequency C.slightly greater than the bus frequency D.the same as the bus voltage
