单项选择题
A.short proof B.ground proof C.explosion proof D.overload proof
The output voltage of a 440 volt, 60 hertz, AC generato...
单项选择题The output voltage of a 440 volt, 60 hertz, AC generator is controlled by the （）.
A.prime mover speed B.exciter output voltage C.load on the alternator D.number of poles
A ground can be defined as an electrical connection bet...
单项选择题A ground can be defined as an electrical connection between the wiring of a motor and its（）.
A.shunt field B.circuit breaker C.metal framework D.inter-pole
Brushless generators are designed to operate without th...
单项选择题Brushless generators are designed to operate without the use of（）.
A.brushes B.slip rings C.commutators D.all of the above
