單項(xiàng)選擇題Voltage will always lead current in a/an ()

A.capacitive circuit
B.inductive circuit
C.magnetic circuit
D.resistive circuit


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1.單項(xiàng)選擇題The number of cycles per second occurring in AC voltage is known as the ()

A.phase angle
B.frequency
C.wave form
D.half mode

2.單項(xiàng)選擇題Complete maintenance of electrical motors should include periodic checks for machine ()

A.vibration
B.watertight integrity
C.speed droop
D.reactive power

3.單項(xiàng)選擇題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

4.單項(xiàng)選擇題The frequency of an AC generator is controlled by the ()

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

5.單項(xiàng)選擇題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