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單項(xiàng)選擇題

Generator brushes are staggered to（）

A.reduce current pulsations
B.reduce brush chatter
C.prevent uneven commutator wear
D.allow greater power generation

單項(xiàng)選擇題

The voltage output of an AC generator is controlled by（）

A.varying the DC exciter voltage
B.varying the reluctance of the air gap
C.regulating the speed of the prime mover
D.shorting out part of the armature windings