单项选择题
A.current in the circuit B.voltage in the circuit C.inductance in the circuit D.resistance in the circuit
Inductance is the property of an electric circuit that ...
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
The operator of electrical motors should keep a constan...
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
Which of the listed sections of an emergency switchboar...
单项选择题Which of the listed sections of an emergency switchboard is used to supply power for alarm signals under emergency conditions?（）
A.The generator and bus transfer section B.The 450 volt, 60 cycle, 3 phase bus C.The 120 volt, 3 phase, 60 cycle bus D.The 24 volt DC bus
