1. The impedance at the resonant frequency of a series RLC circuit with L = 20 mH, C = 0.02 F, and RW = 90 is
2. 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
3. Referring to Problem 20, what is the total parallel resistance (Rp(tot))?
4. 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
5. Referring to Problem 8, the total current is
6. If the resistance in parallel with a parallel resonant circuit is reduced, the bandwidth
7. A 90 resistor, a coil with 30 of reactance, and a capacitor with 50 of reactance are in series across a 12 V ac source. The current through the resistor is
8. A resonant circuit has a lower critical frequency of 7 kHz and an upper critical frequency of 13 kHz. The bandwidth of the circuit is
9. If the value of C in a series RLC circuit is decreased, the resonant frequency
10. A 24 resistor, an inductor with a reactance of 120 , and a capacitor with a reactance of 120 are in series across a 60 V source. The circuit is at resonance. The voltage across the inductor is
11. To tune a parallel resonant circuit to a higher frequency, the capacitance should be
12. In a certain series resonant circuit, VC = 125 V, VL = 125 V, and VR = 40 V. The value of the source voltage is
13. A certain series resonant circuit has a bandwidth of 2 kHz. If the existing coil is replaced with one having a higher value of Q, the bandwidth will
14. A 9 mH coil is in parallel with a 0.015 F capacitor across an 18 kHz ac source. The coil's internal resistance, RW, is 60 . The circuit impedance is
15. A 15 resistor, an inductor with 8 inductive reactance, and a capacitor with 12 capacitive reactance are in parallel across an ac voltage source. The circuit impedance is
16. A certain series RLC circuit with a 200 Hz, 15 V ac source has the following values: R = 12 , C = 80 F, and L = 10 mH. The total impedance, expressed in polar form, is
17. Resonance is a condition in a series RLC circuit in which the capacitive and inductive reactances are equal in magnitude.
18. In a series RLC circuit, the larger reactance determines the net reactance of the circuit.
19. The reactive voltages, VL and VC, cancel at resonance.
20. The quality factor (Q) is the ratio of true power to apparent power.
21. In a parallel RLC circuit, the smaller reactance determines the net reactance of the circuit.
22. In a series RLC circuit, the current is minimum at resonance.
23. At series resonance, the inductive reactance and capacitive reactance are never equal.
24. A lower Q produces a narrower bandwidth.
25. A series resonant circuit is commonly called a tank circuit.