# Electrical Engineering - RLC Circuits and Resonance

### Exercise :: RLC Circuits and Resonance - General Questions

6.

The impedance at the resonant frequency of a series RLC circuit with L = 20 mH, C = 0.02 F, and RW = 90 is

 A. 0 B. 90 C. 20 k D. 40 k Explanation:

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7.

A 6.8 k resistor, a 7 mH coil, and a 0.02 F capacitor are in parallel across a 17 kHz ac source. The coil's internal resistance, RW, is 30 . The equivalent parallel resistance, Rp(eq), is

 A. 1,878 B. 18,780 C. 18,750 D. 626 Explanation:

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8.

Referring to Problem 20, what is the total parallel resistance (Rp(tot))?

 A. 4.99 B. 499 C. 4,992 D. 6,800 Explanation:

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9.

A 200 resistor, a coil with 30 of reactance, and a capacitor of unknown reactance are in series across an ac source. The circuit is at resonance. Circuit impedance

 A. is 230 B. is 170 C. is 200 D. cannot be determined

Explanation:

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10.

Referring to Problem 8, the total current is

 A. 1.5 A B. 573 mA C. 5.73 A D. 1.19 A