单项选择题
The first requirement for logical troubleshooting of any system is the ability to （）.
A.collect all available data on a casualty
B.recognize normal operation
C.identify the probable cause of a symptom
D.isolate the faulty component
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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
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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
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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
