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單項選擇題

A ground can be defined as an electrical connection between the wiring of a motor and its（）.

A.shunt field
B.circuit breaker
C.metal framework
D.inter-pole

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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

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

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