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單項選擇題

A diesel driven emergency generator is prevented from being paralleled with the ships service generators by （）

A.an electrical interlock system
B.an automatic paralleling trip switch
C.the synchronizing oscilloscope
D.the reverse current relay

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單項選擇題

A motor enclosure which protects against falling liquids is classified as （）

A.waterproof
B.drip proof
C.spray tight
D.spray proof

單項選擇題

Universal motors will operate on AC or DC current, and are generally found in （）

A.portable tools
B.large pump motors
C.turbo electric main motors
D.forced draft fans

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