MCQ Exam on RLC Circuits and Resonance - Set 02 - ObjectiveBooks

# 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, RW, is 30 Ω. The equivalent parallel resistance, Rp(eq), is
(A) 1,878 Ω
(B) 18,780 Ω
(C) 18,750 Ω
(D) 626 Ω

2. The reactive voltages, VL and VC, cancel at resonance.
(A) True
(B) False

3. XL and XC have opposing effects in an 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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