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

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单项选择题

The frequency of an AC generator is controlled by the （）

A.rheostat
B.governor
C.exciter
D.capacitor

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

单项选择题

Inductance is the property of an electric circuit that （）

A.opposes any change in the applied voltage
B.opposes any change in the current flow through the circuit
C.aids any changes in the applied voltage
D.aids any changes in the current through the circuit