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EEE :: RLC Circuits and Resonance

1. A 10 resistor, a 90 mH coil, and a 0.015 F capacitor are in series across an ac source. The impedance magnitude at 1,200 Hz below fr is

2.  A. 1,616 B. 161 C. 3,387 D. 1,771

3. In a series RLC circuit that is operating above the resonant frequency, the current

4.  A. lags the applied voltage B. leads the applied voltage C. is in phase with the applied voltage D. is zero

5. A 15 resistor, a 220 H coil, and a 60 pF capacitor are in series across an ac source. What is the bandwidth of the circuit?

6.  A. 138 MHz B. 10,866 Hz C. 1,907 Hz D. 138 kHz

7. A resistor of 3 k, a 0.05 F capacitor, and a 120 mH coil are in series across a 5 kHz, 20 V ac source. What is the impedance, expressed in polar form?

8.  A. 636 B. 3,769 C. 433 D. 4,337

9. A 12 resistor, a 40 F capacitor, and an 8 mH coil are in series across an ac source. The resonant frequency is

10.  A. 28.1 Hz B. 281 Hz C. 2,810 Hz D. 10 kHz

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

12.  A. 0 B. 90 C. 20 k D. 40 k

13. 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

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

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

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

17. 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

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

19. Referring to Problem 8, the total current is

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