Electrical Engineering - RLC Circuits and Resonance

Exercise :: RLC Circuits and Resonance - General Questions

16. 

To tune a parallel resonant circuit to a higher frequency, the capacitance should be

A. increased
B. decreased
C. left alone
D. replaced with inductance

Answer: Option B

Explanation:

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17. 

In a certain series resonant circuit, VC = 125 V, VL = 125 V, and VR = 40 V. The value of the source voltage is

A. 125 V
B. 250 V
C. 290 V
D. 40 V

Answer: Option D

Explanation:

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18. 

A certain series resonant circuit has a bandwidth of 2 kHz. If the existing coil is replaced with one having a higher value of Q, the bandwidth will

A. increase
B. remain the same
C. decrease
D. be less selective

Answer: Option C

Explanation:

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19. 

A 9 mH coil is in parallel with a 0.015 F capacitor across an 18 kHz ac source. The coil's internal resistance, RW, is 60 . The circuit impedance is

A. 17,340
B. 1,734
C. 290
D. 1,018

Answer: Option A

Explanation:

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20. 

A 15 resistor, an inductor with 8 inductive reactance, and a capacitor with 12 capacitive reactance are in parallel across an ac voltage source. The circuit impedance is

A. 12.7
B. 127
C. 4,436
D. 6,174

Answer: Option A

Explanation:

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