# Practice Test: Question Set - 03

**1. A 9 mH coil is in parallel with a 0.015 μF capacitor across an 18 kHz ac source. The coil's internal resistance**

*R*, is 60 Ω. The circuit impedance is_{W}- (A) 17,340 Ω

- (B) 1,734 Ω

- (C) 290 Ω

- (D) 1,018 Ω

**2. 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**

- (A) 7 kHz

- (B) 13 kHz

- (C) 20 kHz

- (D) 4 kHz

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

- (A) 230 Ω

- (B) 170 Ω

- (C) 200 Ω

- (D) Cannot be
determined

**4. At series resonance, the inductive reactance and capacitive reactance are never equal.**

- (A) True

- (B) False

**5. 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- (A) Increase

- (B) Remain
the same

- (C) Decrease

- (D) Be
less selective

**6. In a series**

*RLC*circuit, the larger reactance determines the net reactance of the circuit.- (A) True

- (B) False

**7. A resistor of 3 kΩ, a 0.05 μF 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?**

- (A) 636 Ω

- (B) 3,769 Ω

- (C) 433 Ω

- (D) 4,337 Ω

**8. A 10 Ω resistor, a 90 mH coil, and a 0.015 μF capacitor are in series across an ac source. The impedance magnitude at 1,200 Hz below**

*f*is_{r}- (A) 1,616 Ω

- (B) 161 Ω

- (C) 3,387 Ω

- (D) 1,771 Ω

**9. A lower**

*Q*produces a narrower bandwidth.- (A) True

- (B) False

**10. In a certain series resonant circuit,**

*V*= 125 V,_{C}*V*= 125 V, and_{L}*V*= 40 V. The value of the source voltage is_{R}- (A) 125 V

- (B) 250 V

- (C) 290 V

- (D) 40 V

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