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
相关考题
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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 -
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 -
单项选择题
When the current in a power transmission line is increased, the power loss （）
A.increases as the square of the current
B.decreases as the square root of the current
C.remains the same, as it is independent of current flow
D.increases in direct proportion as the current
