單項選擇題

The main purpose of an electric space heater installed in a large AC generator is to （）

A.prevent the windings from becoming brittle
B.prevent moisture from condensing in the windings during shutdown
C.prevent acidic pitting of the slip rings
D.keep the lube oil warm for quick starting

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單項選擇題

A transformer in an electric circuit serves to （）

A.generate its own electrical power
B.transform electrical energy into mechanical energy
C.increase or decrease circuit voltage as required
D.convert AC current to DC current

單項選擇題

When placed in a magnetic field, which of the materials listed will maintain the highest permeability?（）

A.Glass
B.Bakelite
C.Soft iron
D.Aluminum

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The main purpose of an electric space heater installed in a large AC generator is to （）

你可能感興趣的試題

A transformer in an electric circuit serves to （）

When placed in a magnetic field, which of the materials listed will maintain the highest permeability?（）