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單項選擇題

Brushless generators are designed to operate without the use of（）.

A.brushes
B.slip rings
C.commutators
D.all of the above

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單項選擇題

It （） for an emergency generator to require paralleling.

A.is usual
B.is not usual
C.is necessary
D.is not impossible

單項選擇題

Usually the panels are interlocked with （） so that the devices can be made dead before the doors are opened.

A.protective earth
B.isolators
C.ground switch
D.circuit-breakers

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