Rlc Circuits And Resonance(Electrical Engineering ) Questions and Answers
Question 1. Resonance is a condition in a series RLC circuit in which the capacitive and inductive reactances are equal in magnitude.
True
False
Explanation:-
Answer: Option A. -> True
Question 2. If the value of C in a series RLC circuit is decreased, the resonant frequency increases
True
False
Explanation:-
Answer: Option A. -> True
Question 3. 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
Explanation:-
Answer: Option B. -> 18,780 Ω
Question 4. 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
Increase
Remain the same
Decrease
Be less selective
Explanation:-
Answer: Option C. -> Decrease
Question 5. A lower Q produces a narrower bandwidth.
True
False
Explanation:-
Answer: Option B. -> False
Question 6. The reactive voltages, VL and VC, cancel at resonance.
True
False
Explanation:-
Answer: Option A. -> True
Question 7. To tune a parallel resonant circuit to a higher frequency, the capacitance should be
Increased
Decreased
Left alone
Replaced with inductance
Explanation:-
Answer: Option B. -> Decreased
Question 8. In a parallel RLC circuit, the smaller reactance determines the net reactance of the circuit.
True
False
Explanation:-
Answer: Option A. -> True
Question 9. The impedance at the resonant frequency of a series RLC circuit with L = 20 mH, C = 0.02 µF, and RW = 90 Ω is
0 Ω
90 Ω
20 Ω
40 Ω
Explanation:-
Answer: Option B. -> 90 Ω
Question 10. In a series RLC circuit, the larger reactance determines the net reactance of the circuit.
