单项选择题

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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单项选择题

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

单项选择题

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

单项选择题

An ohmmeter can be used to measure（）

A.current flow in a circuit
B.voltage between two points in a circuit
C.circuit continuity
D.power