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

单项选择题

Voltage generated by most AC generators is fed from the machine to the bus by means of（）.

A.brushes on a commutator
B.brushes on slip rings
C.slip rings on a commutator
D.direct connections from the stator