Parallel Resonance Frequency Viva Questions and Answers
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Question-1. What is parallel resonance?
Answer-1: IL and IC are such that the resultant current I is in phase with the supply voltage, then the network is said to be in resonance.
Question-2. What is the current at resonance?
Answer-2: Current is minimum because impedance is maximum.
Question-3. What is the meant by rejector circuit?
Answer-3: As the parallel resonate circuit offers high impedance to the current at the frequency, the circuit is called a rejector circuit.
Question-4. What is a tank circuit?
Answer-4: A parallel resonate circuit is called tank circuit. This produces oscillations in the network.
Question-5. What is anti-resonance?
Answer-5: The condition of parallel resonance is called anti-resonance.
Question-6. What is resonance curve?
Answer-6: A variation of line current with frequency is called resonance curve.
Question-7. What are the characteristics of parallel resonance?
Answer-7: The main characteristics of parallel resonance are:
1. The circuit impedance is maximum
2. The circuit current is minimum
3. I is out of phase with V.
Question-8. What is impedance?
Answer-8: Combined effect of reactance and resistance Z = Vrms / Irms
Question-9. Expression for resonance frequency?
Answer-9: Resonant frequency is given by fo = 1 / 2πsqrt(LC)
Question-10. Define self-inductance of a coil?
Answer-10: It is the property of the coil due to which it opposes the change of current in the circuit.
Question-11. What do you mean by Quality factor(Q-factor)?
Answer-11: The ability of a reactive device to store energy as compared to the dissipation of the energy within the device is called Q-factor. It is given by Q = XL / R = fo / (f2 - f1)
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