单项选择题
A.vibration B.watertight integrity C.speed droop D.reactive power
The frequency of an alternator is controlled from the m...
单项选择题The frequency of an alternator is controlled from the main switchboard by adjusting the（）
A.frequency meter B.voltage regulator C.governor control D.sychroscope switch
The frequency of an AC generator is controlled by the （...
单项选择题The frequency of an AC generator is controlled by the （）
A.rheostat B.governor C.exciter D.capacitor
Capacitance is the property of an electric circuit oppo...
单项选择题Capacitance is the property of an electric circuit opposing a change in the （）
A.current in the circuit B.voltage in the circuit C.inductance in the circuit D.resistance in the circuit
