单项选择题

An electrical device which employs a stationary armature and a rotating electromagnetic field is used aboard ship as a （）.

A.magnetic amplifier
B.ship’s service alternator
C.three-wire DC generator
D.saturable core reactor

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单项选择题

As a general rule, the first troubleshooting action to be taken in checking faulty electric control devices is to （）.

A.draw a one line diagram of the circuitry
B.test all fuses and measure the line voltage
C.take megger readings
D.insulate the apparatus from ground

单项选择题

A circuit breaker differs from a fuse in that a circuit breaker （）.

A.melts and must be replaced
B.is enclosed in a tube of insulating material with metal ferrules at each end
C.gives no visual indication of having opened the circuit
D.trips to break the circuit and may be reset