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RLC Circuits and Resonance - General Questions

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RLC Circuits and Resonance - General Questions

1. 

A certain series RLC circuit with a 200 Hz, 15 V ac source has the following values: R = 12 , C = 80 F, and L = 10 mH. The total impedance, expressed in polar form, is

A. 12.28∠12.34° Ω
B. 12.57∠12.34° Ω
C. 9.95∠12.34° Ω
D. 12.62∠12.34° Ω

Answer: Option A

Explanation:

No answer description available for this question. 
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2. 

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 Ω
B. 127 Ω
C. 4,436 Ω
D. 6,174 Ω

Answer: Option A

Explanation:

No answer description available for this question.
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3. 

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:

No answer description available for this question. 
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4. 

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:

No answer description available for this question. 
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5. 

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:

No answer description available for this question.
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6. 

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:

No answer description available for this question.
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7. 

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:

No answer description available for this question.
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8. 

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:

No answer description available for this question.
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