Subelement D
Circuits
Section 29
R-L-C Circuits
What is the approximate magnitude of the impedance of a parallel R-L-C circuit at resonance?
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Correct AnswerApproximately equal to the circuit resistance.
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Approximately equal to XL.
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Low, as compared to the circuit resistance.
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Approximately equal to XC.
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What is the approximate magnitude of the impedance of a series R-L-C circuit at resonance?
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High, as compared to the circuit resistance.
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Correct AnswerApproximately equal to the circuit resistance.
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Approximately equal to XL.
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Approximately equal to XC.
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How could voltage be greater across reactances in series than the applied voltage?
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Resistance.
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Conductance.
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Capacitance.
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Correct AnswerResonance.
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What is the characteristic of the current flow in a series R-L-C circuit at resonance?
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Correct AnswerMaximum.
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Minimum.
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DC.
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Zero.
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What is the characteristic of the current flow within the parallel elements in a parallel R-L-C circuit at resonance?
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Minimum.
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Correct AnswerMaximum.
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DC.
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Zero.
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What is the relationship between current through a resonant circuit and the voltage across the circuit?
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The current and voltage are 180 degrees out of phase.
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The current leads the voltage by 90 degrees.
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Correct AnswerThe voltage and current are in phase.
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The voltage leads the current by 90 degrees.
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