单项选择题
A.shunt B.high-resistance coil in the armature circuit C.low-resistance coil in the armature circuit D.shunt and a coil of high resistance
When current and voltage reach maximum values at the sa...
单项选择题When current and voltage reach maximum values at the same time, the power factor is（）
A.minimum B.maximum C.leading D.lagging
Which is an acceptable means of correcting high mica be...
单项选择题Which is an acceptable means of correcting high mica between commutator bars?（）
Generator brushes are staggered to（）A.reduce current pu...
单项选择题Generator brushes are staggered to（）
A.reduce current pulsations B.reduce brush chatter C.prevent uneven commutator wear D.allow greater power generation
