RLC Circuit MCQ’s
Q: If the resistance in parallel with a parallel resonant circuit is reduced, the bandwidth
- Disappears
- Becomes Sharper
- Increases
- Decreases
Answer: (4) Decreases
Q: To tune a parallel resonant circuit to a higher frequency, the capacitance should be
- Increased
- Decreased
- Left alone
- Replaced with inductance
Answer: (2) Decreased
Q: A 15 Ω resistor, an inductor with 8 Ω inductive reactance, and a capacitor with 12 Ω capacitive reactance are in parallel across an ac voltage source.
- 12.7 Ω
- 127 Ω
- 4.436 Ω
- 6,174 Ω
Answer: (1) 12.7 Ω
Q: What is the value of resonant frequency if the value of C in a series RLC circuit is decreased?
- Is not affected
- Increases
- Is reduced to zero
- Decreases
Answer: (2) Increases
Q: In a series RLC circuit that is operating above the resonant frequency the current
- Lags the applied voltage
- Leads the applied voltage
- Is in phase with the applied voltage
- Is zero
Answer: (1) Lags the applied voltage
Q: An inductor with a reactance of 120 Ω, a capacitor with a reactance of 120 Ω and a 24 Ω resistor are in series across a 60 V source. The circuit is at resonance. The voltage across the inductor is
- 60 V
- 660 V
- 30 V
- 300 V
Answer: (4) 300 V
Q: 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
- 1,878 Ω
- 18,780 Ω
- 18,750 Ω
- 626 Ω
Answer: (2) 18,780 Ω
Q: A 15 kΩ resistor, a 220 μH coil, and a 60 pF capacitor are in series across an ac source. What is the bandwidth of the circuit?
- 138 MHz
- 10,866 Hz
- 1,907 Hz
- 138 kHz
Answer: (2) 10,866 Hz
Q: 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
- 9 mA
- 90 mA
- 13 mA
- 130 mA
Answer: (3) 130 mA
Q: The total impedance, expressed in polar form for 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 is
- 12.28 ㄥ12.340 Ω
- 12.57 ㄥ12.340 Ω
- 9.95 ㄥ12.340 Ω
- 12.62 ㄥ12.340 Ω
Answer: (1) 12.28 ㄥ12.340 Ω