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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: XL = XC
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: fo = 1 / 2πsqrt(LC) , fo 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=(f2 - f1) in Hz
Question-8. What are f1, f2 ?
Answer-8: f1, f2 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, Im = V / Zmin = V / R
c) I is in phase with V i.e. φ = 0.
d) Reactance = 0, i.e. XL = XC.
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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