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單項選擇題

The separate supplies are connected in either star or delta formationThe star formation is most commonly used and requires（） slip-rings on the alternator.

A.two
B.three
C.four
D.five

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After a ship enters service it is（） for the main bus-bar to be made dead.

A.usually
B.commonly
C.exceptional
D.unavoidably

單項選擇題

（） is a machine by which electrical energy is transformed into mechanical energy.

A.An alternator
B.An electric motor
C.A diesel engine
D.A main switchboard

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