# Practice Test: Question Set - 02

**1. A 6.8 kΩ resistor, a 7 mH coil, and a 0.02 μF capacitor are in parallel across a 17 kHz ac source. The coil's internal resistance,**

*R*, is 30 Ω. The equivalent parallel resistance,_{W}*R*(eq), is_{p}- (A) 1,878 Ω

- (B) 18,780 Ω

- (C) 18,750 Ω

- (D) 626 Ω

**2. The reactive voltages,**

*V*and_{L}*V*, cancel at resonance._{C}- (A) True

- (B) False

**3.**

*X*and_{L}*X*have opposing effects in an_{C}*RLC*circuit.- (A) True

- (B) False

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

- (A) 138 MHz

- (B) 10,866 Hz

- (C) 1,907 Hz

- (D) 138 kHz

**5. Resonance is a condition in a series**

*RLC*circuit in which the capacitive and inductive reactances are equal in magnitude.- (A) True

- (B) False

**6. A 90 Ω resistor, a coil with 30 Ω of reactance, and a capacitor with 50 Ω of reactance are in series across a 12 V ac source. The current through the resistor is**

- (A) 9 mA

- (B) 90 mA

- (C) 13 mA

- (D) 130 mA

**7. The quality factor (**

*Q*) is the ratio of true power to apparent power.- (A) True

- (B) False

**8. In a series**

*RLC*circuit, the current is minimum at resonance.- (A) True

- (B) False

**9. If the value of**

*C*in a series*RLC*circuit is decreased, the resonant frequency increases- (A) True

- (B) False

**10. A certain series**

*RLC*circuit with a 200 Hz, 15 V ac source has the following values:*R*= 12 Ω,*C*= 80 μF, and*L*= 10 mH. The total impedance, expressed in polar form, is- (A) 12.28 ∠12.34° Ω

- (B) 12.57 ∠12.34° Ω

- (C) 9.95 ∠12.34° Ω

- (D) 12.62 ∠12.34° Ω

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