单项选择题

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

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

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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

单项选择题

The operator of electrical motors should keep a constant check on the loads they carry because （）

A.low loads necessitate frequent insulation cleaning
B.exceeding nameplate values shortens useful life
C.energy is wasted if full loading is not utilized
D.power factor correction methods are load dependent