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單項選擇題

An a-cswitchboard is usually（） the corresponding d-cboard because of the higher voltage and lower currents and smaller bus-bars.

A.larger and heavier than
B.as much as
C.smaller and lighter than
D.more dangerous than

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單項選擇題

The star formation is most commonly used and requires（） on the alternator.

A.one slip-ring
B.two sliprings
C.three sliprings
D.four sliprings

單項選擇題

The field coils（） and the armature is（）This is in fact the arrangement adopted for large, heavy duty alternators.

A.stationary；rotate
B.stationary；stationary
C.rotate；stationary
D.rotate；rotate

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