Electronic Principles
When a series RLC circuit is operating at its resonant frequency:

None of these
the difference between inductive and capacitive reactance is equal to the resistance
inductive reactance is greater than the capacitive reactance
inductive reactance is equal to the capacitive reactance
capacitive reactance is greater than the inductive reactance

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Electronic Principles
For a pure capacitor:

ac current leads the voltage by 90 degree
ac current lags the voltage by 90 degree
ac current is converted to dc voltage
ac current and voltage are exactly in phase
None of these

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Electronic Principles
A low-pass filter:

passes lower-frequency signals and reduces higher-frequency signals
has no effect on ac signals
passes higher-frequency signals and reduces lower-frequency signals
None of these
reduces the level of all frequencies by a significant amount

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