单项选择题
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
An electrical device which employs a stationary armatur...
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
As a general rule, the first troubleshooting action to ...
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
A circuit breaker differs from a fuse in that a circuit...
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
