RESONANCE MCQs

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1. For a series or parallel LC circuit, resonance occurs when _______.





2. When either L or C is increased, the resonant frequency of the LC circuit _______.





3. The resonant frequency of an LC circuit is 1000KHz. If L is doubled and C is reduced to 1/8th, the resonant frequency is _______.





4. A coil has a 1000 Ω XL & 5 Ω Ri. Its Q equals _______.





5. In a parallel LC circuit, at the resonant frequency, the _______.





6. At resonance, the phase angle equals _______.





7. In a series LC circuit, at resonant frequency, the _______.





8. A series LC circuit has a Q of 100 at resonance. When 5mV is applied at resonant frequency, the voltage across C equals _______.





9. An LC circuit is resonant at 1000KHz & has a Q of 100. The bandwidth b/w half power points are _______.





10. In a low Q parallel resonant circuit, when XL = XC _______.





11. Resonance curve shows variation of circuit current with _______.





12. Higher the Q-factor of a circuit _______ its bandwidth.





13. Lower the resistance of a resonant circuit, _______ its selectivity.





14. Sharpness of tuning depends _______ on the Q of a coil.





15. In parallel resonance, the line current is _______ at the resonant frequency.





16. Bandwidth of a series resonant circuit depends on _______.





17. The power factor of a resonant series circuit is _______.





18. Higher the Q factor of a series circuit _______.





19. As the Q factor of a circuit _______ its selectivity becomes _______.





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