Electrical Engineering - RLC Circuits and Resonance

Exercise :: RLC Circuits and Resonance - General Questions

11. 

If the resistance in parallel with a parallel resonant circuit is reduced, the bandwidth

A. disappears
B. becomes sharper
C. increases
D. decreases

Answer: Option D

Explanation:

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12. 

A 90 resistor, a coil with 30 of reactance, and a capacitor with 50 of reactance are in series across a 12 V ac source. The current through the resistor is

A. 9 mA
B. 90 mA
C. 13 mA
D. 130 mA

Answer: Option D

Explanation:

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13. 

A resonant circuit has a lower critical frequency of 7 kHz and an upper critical frequency of 13 kHz. The bandwidth of the circuit is

A. 7 kHz
B. 13 kHz
C. 20 kHz
D. 6 kHz

Answer: Option D

Explanation:

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14. 

If the value of C in a series RLC circuit is decreased, the resonant frequency

A. is not affected
B. increases
C. is reduced to zero
D. decreases

Answer: Option B

Explanation:

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15. 

A 24 resistor, an inductor with a reactance of 120 , and a capacitor with a reactance of 120 are in series across a 60 V source. The circuit is at resonance. The voltage across the inductor is

A. 60 V
B. 660 V
C. 30 V
D. 300 V

Answer: Option D

Explanation:

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