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單項(xiàng)選擇題

When current and voltage reach maximum values at the same time, the power factor is（）

A.minimum
B.maximum
C.leading
D.lagging

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單項(xiàng)選擇題

Which is an acceptable means of correcting high mica between commutator bars?（）

A.undercutting
B.sanding
C.burnishing
D.filing

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