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

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


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1.單項選擇題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

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

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

3.單項選擇題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

4.單項選擇題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

5.單項選擇題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