RLC Circuits and Resonance Questions and Answers
RLC Circuits and Resonance aptitude questions and answers with explanations form a core part of electronics and communication engineering exams. These questions involve analyzing resistive, inductive, and capacitive components in series and parallel combinations. Understanding resonance, impedance, and frequency response is key for solving related numerical problems efficiently. Competitive exams like GATE, ISRO, and BARC often include RLC circuit problems to evaluate candidates’ understanding of AC circuit theory. Practicing aptitude questions with detailed explanations builds a strong conceptual base, enabling students to master time constants, bandwidth, and resonance frequency calculations.
RLC Circuits and Resonance
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13 questions
1. What is the Q (Quality factor) of a series circuit that resonates at 6 kHz, has equal reactance of 4 kilo-ohms each, and a resistor value of 50 ohms?
- 0.001
- 50
- 80
- 4.0
2. What is the range between f1 and f2 of an RLC circuit that resonates at 150 kHz and has a Q of 30?
- 100.0 kHz to 155.0 kHz
- 147.5 kHz to 152.5 kHz
- 4500 kHz to 295.5 kHz
- 149,970 Hz to 150,030 Hz
3. What effect will a parallel tank have upon final filter current?
- very little
- The bandpass frequencies will change.
- The frequency cutoff will change.
- The impedance will block output.
4. When a parallel circuit resonates it is said to:
- flywheel
- oscillate
- both of the above
- none of the above
5. When a full band of frequencies is allowed to pass through a filter circuit to the output, the resonant circuit is called a:
- low-pass filter
- high-pass filter
- band-stop filter
- bandpass filter
6. At resonance, the term bandwidth includes all frequencies that allow what percentage of maximum current to flow?
- 50
- 62.3
- 70.7
- 95.3
7. What is the true power consumed in a 30 V series RLC circuit if Z = 20 ohms and R = 10 ohms?
- 15.0 watts
- 22.5 watts
- 30.0 watts
- 45.0 watts
8. What is the current phase angle for a parallel RLC circuit when IL = 15.3 A, IC = 0.43 A, and IR = 3.5 A?
- 76.7 degrees
- –4.25 degrees
- 88.8 degrees
- –76.7 degrees
9. At any resonant frequency, what voltage is measured across the two series reactive components?
- applied
- reactive
- zero
- inductive and capacitive
10. At any resonant frequency, what net voltage is measured across the two series reactive components?
- Applied voltage
- Reactive voltage
- Zero voltage
- VL + VC voltage