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Question-1. What is meant by electrical resonance?

Answer-1: When impedance in the circuit is minimum current is maximum this is known as electrical resonance.

Question-2. What is the condition for resonance?

Answer-2: X_{L} = X_{C}

Inductive reactance = capacitive reactance, Z becomes minimum, When Z = R.

Question-3. What is the value of Z in LCR series circuit at resonance?

Answer-3: Z = R

Question-4. What is the resonance frequency?

Answer-4: The frequency of applied AC at which resonance takes place or current is maximum.

Question-5. Expression for resonance frequency?

Answer-5: f_{o} = 1 / 2πsqrt(LC) , f_{o} is independent of circuit resistance.

Question-6. Define band width ?

Answer-6: In series LCR circuit, bandwidth is defined as the range of frequency for which the power dissipated in the resistance is equal to half the power dissipated at resonance.

Question-7. In general, what is the expression for bandwidth ?

Answer-7: Bandwidth=(f_{2} - f_{1}) in Hz

Question-8. What are f_{1}, f_{2} ?

Answer-8: f_{1}, f_{2} are half power frequencies. The values of frequencies at which the power input is half its maximum value are called half power frequencies.

Question-9. What are characteristics of series resonance?

Answer-9: a) Z is minimum when Z = R.

b) I is maximum, I_{m} = V / Z_{min} = V / R

c) I is in phase with V i.e. φ = 0.

d) Reactance = 0, i.e. X_{L} = X_{C}.

Question-10. Why do you call LCR series resonance circuit as an acceptor circuit?

Answer-10: It offers a low impedance to the current at a resonance frequency, it is called acceptor circuit

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