Question 1

A variable capacitor is connected to an ac source. What effect does decreasing the capacitance have on the reactance and current in this circuit?

Accepted Answer

A)   
B)   
C)   
D)   
E)   F) C) and D)
G) A) and B)

Question 2

What is the inductance of the inductor in a series RCL circuit with a resonant frequency of 640 Hz if the only other element in the circuit is a 1.2-µF capacitor?

Accepted Answer

A)  52 mH
B)  74 mH
C)  0.12 H
D)  2.1 H
E)  13 HF) A) and C)
G) All of the above

Question 3

For which one of the following circuit arrangements will the power factor be non-zero?

Accepted Answer

A)  a capacitor in series with an ac generator
B)  an inductor in series with an ac generator
C)  two capacitors in series with an ac generator
D)  a capacitor and resistor in series with an ac generator
E)  a capacitor and inductor in series with an ac generatorF) A) and B)
G) A) and C)

Question 4

The following table gives the reactance and rms voltage across the elements of a series RCL circuit: 
-Determine the peak (not rms)  voltage of the ac generator.

Accepted Answer

A)  150 V
B)  212 V
C)  300 V
D)  414 V
E)  533 VF) A) and D)
G) A) and E)

Question 5

An ac generator supplies a peak (not rms)  voltage of 120.0 V at 60.0 Hz. It is connected in series with a 50.0- Ω\varOmegaΩ  resistor and a 0.500-H inductor.
-What is the average power dissipated in the circuit?

Accepted Answer

A)  9.50 W
B)  21.2 W
C)  74.9 W
D)  113 W
E)  138 W F) B) and D)
G) A) and B)

Question 6

An ac generator supplies an rms (not peak)  voltage of 180 V at 60.0 Hz. The generator is connected in series with a 0.50-H inductor, a 6.0-µF capacitor and a 300- Ω\varOmegaΩ  resistor.
-What is the peak (not rms)  voltage across the capacitor?

Accepted Answer

A)  120 V
B)  180 V
C)  190 V
D)  210 V
E)  290 V F) A) and B)
G) C) and E)

Question 7

Which one of the following statements concerning an ac circuit is true?

Accepted Answer

A)  The current and voltage are in phase for a capacitor in an ac circuit.
B)  On average, the power dissipated by a resistor in an ac circuit is zero.
C)  For a resistor in an ac circuit, the current and voltage are 90° out of phase.
D)  Inductors in an ac circuit offer little opposition to current at high frequencies.
E)  When only resistance is present in an ac circuit, voltage and current are in phase.F) C) and E)
G) All of the above

Question 8

The graph shows the impedance as a function of frequency for a series RCL circuit. At what frequency does the capacitor make the largest contribution? 1 B) f2 C) f3 D) f1 or f3 E) f1 or f2 or f3" class="answers-bank-image d-inline" rel="preload" >

Accepted Answer

A)  f1
B)  f2
C)  f3
D)  f1 or f3
E)  f1 or f2 or f3F) A) and D)
G) B) and E)

Question 9

An oscillating LC circuit has a resonant frequency of 1.2 × 106 Hz. The diagram shows the system at t = 0 s when there is no charge on the capacitor and the current is in the direction shown. At this time, the energy stored in the inductor is 2.5 × 10-7 J. 6 Hz. The diagram shows the system at t = 0 s when there is no charge on the capacitor and the current is in the direction shown. At this time, the energy stored in the inductor is 2.5 × 10-7 J.   -Determine the numerical value of the capacitance. A) 2.4 × 10-11 F B) 3.6 × 10-11 F C) 4.4 × 10-11 F D) 6.8 × 10-11 F E) 8.8 × 10-11 F" class="answers-bank-image d-inline" rel="preload" >
-Determine the numerical value of the capacitance.

Accepted Answer

A)  2.4 × 10-11 F
B)  3.6 × 10-11 F
C)  4.4 × 10-11 F
D)  6.8 × 10-11 F
E)  8.8 × 10-11 FF) A) and B)
G) A) and C)

Question 10

Two 250-µF capacitors and a 1.5-mH inductor are connected as shown in the figure. It is desired to "drive" the circuit by placing an ac generator in series with the inductor. Which one of the following generator output voltages will produce the largest current in the above circuit? Assume that V is in volts when t is in seconds. 6 rad/s) t] B) V = 0.6 sin[(1.2 × 103 rad/s) t] C) V = 1.2 sin[(5.3 × 106 rad/s) t] D) V = 1.2 sin[(2.3 × 105 rad/s) t] E) V = 2.8 sin[(4.6 × 106 rad/s) t]" class="answers-bank-image d-inline" rel="preload" >

Accepted Answer

A)  V = 0.6 sin[(1.1 × 106 rad/s) t]
B)  V = 0.6 sin[(1.2 × 103 rad/s) t]
C)  V = 1.2 sin[(5.3 × 106 rad/s) t]
D)  V = 1.2 sin[(2.3 × 105 rad/s) t]
E)  V = 2.8 sin[(4.6 × 106 rad/s) t]F) B) and C)
G) B) and E)

Question 11

Two series RCL circuits have the same resonant frequency. Circuit A has an inductance of 0.55 H and circuit B has an inductance of 0.15 H. Determine the ratio of the capacitances of the circuits, CA/CB.

Accepted Answer

A)  0.44
B)  0.27
C)  3.7
D)  1.8
E)  2.4F) A) and B)
G) A) and C)

Question 12

An ac generator supplies an rms (not peak)  voltage of 180 V at 60.0 Hz. The generator is connected in series with a 0.50-H inductor, a 6.0-µF capacitor and a 300- Ω\varOmegaΩ  resistor.
-Determine the peak voltage of the generator.

Accepted Answer

A)  180 V
B)  255 V
C)  300 V
D)  360 V
E)  480 V F) A) and E)
G) B) and C)

Question 13

Use the information given in the figure for the series RCL circuit to determine the phase angle between the current and the voltage.

Accepted Answer

A)  zero degrees
B)  +5.3°
C)  -9.6°
D)  -84°
E)  +90°F) A) and E)
G) D) and E)

Question 14

Which one of the following graphs shows how the inductive reactance varies with frequency?

Accepted Answer

A)  a
B)  b
C)  c
D)  d
E)  eF) A) and E)
G) B) and E)

Question 15

Use the information given in the figure for the series RCL circuit to determine its total impedance.

Accepted Answer

A)  300  Ω\varOmegaΩ 
B)  500  Ω\varOmegaΩ 
C)  1500  Ω\varOmegaΩ 
D)  1700  Ω\varOmegaΩ 
E)  1900  Ω\varOmegaΩF) C) and D)
G) B) and D)

Question 16

A variable inductor is connected to an ac source. What effect does increasing the inductance have on the reactance and current in this circuit?

Accepted Answer

A)   
B)   
C)   
D)   
E)   F) B) and E)
G) B) and D)

Question 17

Which circuit elements act to oppose changes in the current in an ac circuit?

Accepted Answer

A)  resistors only
B)  capacitors only
C)  inductors only
D)  both resistors and inductors
E)  both capacitors and resistorsF) A) and B)
G) None of the above

Question 18

An oscillating LC circuit has a resonant frequency of 1.2 × 106 Hz. The diagram shows the system at t = 0 s when there is no charge on the capacitor and the current is in the direction shown. At this time, the energy stored in the inductor is 2.5 × 10-7 J. 6 Hz. The diagram shows the system at t = 0 s when there is no charge on the capacitor and the current is in the direction shown. At this time, the energy stored in the inductor is 2.5 × 10-7 J.   -Determine the value of the current at the instant shown in the drawing. A) 0.02 A B) 0.03 A C) 0.05 A D) 0.09 A E) 0.12 A" class="answers-bank-image d-inline" rel="preload" >
-Determine the value of the current at the instant shown in the drawing.

Accepted Answer

A)  0.02 A
B)  0.03 A
C)  0.05 A
D)  0.09 A
E)  0.12 AF) B) and C)
G) A) and E)

Question 19

An ac generator is connected across the terminals of a 3.25-µF capacitor. Determine the frequency at which the capacitive reactance is 375  Ω\varOmegaΩ .

Accepted Answer

A)  60.0 Hz
B)  72.4 Hz
C)  85.7 Hz
D)  98.9 Hz
E)  131 Hz F) None of the above
G) B) and E)

Question 20

In an ac circuit, a 0.055-H inductor is connected to a generator that has an rms voltage of 18 V and operates at 50.0 Hz. What is the rms current through the inductor?

Accepted Answer

A)  0.62 A
B)  2.0 A
C)  3.2 A
D)  1.0 A
E)  14 AF) A) and D)
G) C) and D)

Exam 23: Alternating Current Circuits

A variable inductor is connected to an ac source. What effect does increasing the inductance have on the reactance and current in this circuit?

Correct Answer
verified

The graph shows the impedance as a function of frequency for a series RCL circuit. At what frequency does the capacitor make the largest contribution?

Correct Answer
verified

Use the information given in the figure for the series RCL circuit to determine the phase angle between the current and the voltage.

Correct Answer
verified

Use the information given in the figure for the series RCL circuit to determine its total impedance. $Use the information given in the figure for the series RCL circuit to determine its total impedance. A) 300 \varOmega B) 500 \varOmega C) 1500 \varOmega D) 1700 \varOmega E) 1900 \varOmega$

Correct Answer
verified

Two series RCL circuits have the same resonant frequency. Circuit A has an inductance of 0.55 H and circuit B has an inductance of 0.15 H. Determine the ratio of the capacitances of the circuits, C_A/C_B.

Correct Answer
verified

For which one of the following circuit arrangements will the power factor be non-zero?

Correct Answer
verified

Which one of the following statements concerning an ac circuit is true?

Correct Answer
verified

In an ac circuit, a 0.055-H inductor is connected to a generator that has an rms voltage of 18 V and operates at 50.0 Hz. What is the rms current through the inductor?

Correct Answer
verified

An ac generator supplies an rms (not peak) voltage of 180 V at 60.0 Hz. The generator is connected in series with a 0.50-H inductor, a 6.0-µF capacitor and a 300- $\varOmega$ resistor. -What is the peak (not rms) voltage across the capacitor?

Correct Answer
verified

An ac generator supplies a peak (not rms) voltage of 120.0 V at 60.0 Hz. It is connected in series with a 50.0- $\varOmega$ resistor and a 0.500-H inductor. -What is the average power dissipated in the circuit?

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

An ac generator is connected across the terminals of a 3.25-µF capacitor. Determine the frequency at which the capacitive reactance is 375 $\varOmega$ .

Correct Answer
verified

Correct Answer
verified

What is the inductance of the inductor in a series RCL circuit with a resonant frequency of 640 Hz if the only other element in the circuit is a 1.2-µF capacitor?

Correct Answer
verified

Which circuit elements act to oppose changes in the current in an ac circuit?

Correct Answer
verified

Which one of the following graphs shows how the inductive reactance varies with frequency?

Correct Answer
verified

The following table gives the reactance and rms voltage across the elements of a series RCL circuit: -Determine the peak (not rms) voltage of the ac generator.

Correct Answer
verified

A variable capacitor is connected to an ac source. What effect does decreasing the capacitance have on the reactance and current in this circuit?

Correct Answer
verified

An ac generator supplies an rms (not peak) voltage of 180 V at 60.0 Hz. The generator is connected in series with a 0.50-H inductor, a 6.0-µF capacitor and a 300- $\varOmega$ resistor. -Determine the peak voltage of the generator.

Correct Answer
verified

Exam 23: Alternating Current Circuits

A variable inductor is connected to an ac source. What effect does increasing the inductance have on the reactance and current in this circuit?

Correct AnswerverifiedShow Answer

The graph shows the impedance as a function of frequency for a series RCL circuit. At what frequency does the capacitor make the largest contribution?

Correct AnswerverifiedShow Answer

Use the information given in the figure for the series RCL circuit to determine the phase angle between the current and the voltage.

Correct AnswerverifiedShow Answer

Use the information given in the figure for the series RCL circuit to determine its total impedance.

Correct AnswerverifiedShow Answer

Two series RCL circuits have the same resonant frequency. Circuit A has an inductance of 0.55 H and circuit B has an inductance of 0.15 H. Determine the ratio of the capacitances of the circuits, CA/CB.

Correct AnswerverifiedShow Answer

For which one of the following circuit arrangements will the power factor be non-zero?

Correct AnswerverifiedShow Answer

Which one of the following statements concerning an ac circuit is true?

Correct AnswerverifiedShow Answer

In an ac circuit, a 0.055-H inductor is connected to a generator that has an rms voltage of 18 V and operates at 50.0 Hz. What is the rms current through the inductor?

Correct AnswerverifiedShow Answer

An ac generator supplies an rms (not peak) voltage of 180 V at 60.0 Hz. The generator is connected in series with a 0.50-H inductor, a 6.0-µF capacitor and a 300- Ω\varOmegaΩ resistor. -What is the peak (not rms) voltage across the capacitor?

Correct AnswerverifiedShow Answer

An ac generator supplies a peak (not rms) voltage of 120.0 V at 60.0 Hz. It is connected in series with a 50.0- Ω\varOmegaΩ resistor and a 0.500-H inductor. -What is the average power dissipated in the circuit?

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

An ac generator is connected across the terminals of a 3.25-µF capacitor. Determine the frequency at which the capacitive reactance is 375 Ω\varOmegaΩ .

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

What is the inductance of the inductor in a series RCL circuit with a resonant frequency of 640 Hz if the only other element in the circuit is a 1.2-µF capacitor?

Correct AnswerverifiedShow Answer

Which circuit elements act to oppose changes in the current in an ac circuit?

Correct AnswerverifiedShow Answer

Which one of the following graphs shows how the inductive reactance varies with frequency?

Correct AnswerverifiedShow Answer

The following table gives the reactance and rms voltage across the elements of a series RCL circuit: -Determine the peak (not rms) voltage of the ac generator.

Correct AnswerverifiedShow Answer

A variable capacitor is connected to an ac source. What effect does decreasing the capacitance have on the reactance and current in this circuit?

Correct AnswerverifiedShow Answer

An ac generator supplies an rms (not peak) voltage of 180 V at 60.0 Hz. The generator is connected in series with a 0.50-H inductor, a 6.0-µF capacitor and a 300- Ω\varOmegaΩ resistor. -Determine the peak voltage of the generator.

Correct AnswerverifiedShow Answer

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Use the information given in the figure for the series RCL circuit to determine its total impedance. $Use the information given in the figure for the series RCL circuit to determine its total impedance. A) 300 \varOmega B) 500 \varOmega C) 1500 \varOmega D) 1700 \varOmega E) 1900 \varOmega$

Correct Answer
verified

Two series RCL circuits have the same resonant frequency. Circuit A has an inductance of 0.55 H and circuit B has an inductance of 0.15 H. Determine the ratio of the capacitances of the circuits, C_A/C_B.

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

An ac generator supplies an rms (not peak) voltage of 180 V at 60.0 Hz. The generator is connected in series with a 0.50-H inductor, a 6.0-µF capacitor and a 300- $\varOmega$ resistor. -What is the peak (not rms) voltage across the capacitor?

Correct Answer
verified

An ac generator supplies a peak (not rms) voltage of 120.0 V at 60.0 Hz. It is connected in series with a 50.0- $\varOmega$ resistor and a 0.500-H inductor. -What is the average power dissipated in the circuit?

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

An ac generator is connected across the terminals of a 3.25-µF capacitor. Determine the frequency at which the capacitive reactance is 375 $\varOmega$ .

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

An ac generator supplies an rms (not peak) voltage of 180 V at 60.0 Hz. The generator is connected in series with a 0.50-H inductor, a 6.0-µF capacitor and a 300- $\varOmega$ resistor. -Determine the peak voltage of the generator.

Correct Answer
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