Question 1

In a series LRC circuit the rms voltage across the resistor is 80.0 V,across the capacitor is 120 V,and across the inductor is 60.0 V.What is the rms voltage applied to this circuit?

Accepted Answer

A)   60.0 V
B)   80.0 V
C)   100 V
D)   120 V
E)   140 VF) A) and D)
G) A) and C)

Question 2

What inductance is needed in series with a 4.7  μ\muμ F capacitor for a resonant frequency of 10 kHz?

Accepted Answer

A)   22 uH
B)   54 uH
C)   0.66 uH
D)   5.3 mH E) B) and D)
F) B) and C)

Question 3

As the ac frequency in an RLC circuit is increased to very high values,which of the contributions to the impedance dominates?

Accepted Answer

A)   the capacitive reactance
B)   the inductive reactance
C)   the resistance
D)   the combined capacitive reactance and the resistance
E)   More information is needed.F) A) and B)
G) C) and D)

Question 4

A 2.2 k  Ω\OmegaΩ  resistor and a 2.0  μ\muμ F capacitor are in series in an ac circuit.The rms voltages across each are equal.What is the frequency?

Accepted Answer

A)   23 Hz
B)   15 Hz
C)   72 Hz
D)   36 Hz
E)   There is insufficient information to solve. F) B) and D)
G) B) and E)

Question 5

In a series LRC circuit the rms voltage across the resistor is 80 V,across the capacitor is 120 V,and across the inductor is 60 V.What is the phase constant for this circuit?

Accepted Answer

A)   27 ∘^{\circ}∘ 
B)   -27 ∘^{\circ}∘ 
C)   37 ∘^{\circ}∘ 
D)   -37 ∘^{\circ}∘ 
E)   -41 ∘^{\circ}∘F) C) and E)
G) C) and D)

Question 6

The inductive reactance of an RLC circuit is 36  Ω\OmegaΩ .If the frequency is doubled,what is the new inductive reactance?

Accepted Answer

A)   72  Ω\OmegaΩ 
B)   36  Ω\OmegaΩ 
C)   19  Ω\OmegaΩ 
D)   6.0  Ω\OmegaΩ 
E)   3.0  Ω\OmegaΩF) B) and E)
G) None of the above

Question 7

What is the capacitive reactance of an 8.00  μ\muμ F V capacitor attached to 120 V rms at 60.0 Hz?

Accepted Answer

A)   166  Ω\OmegaΩ 
B)   332  Ω\OmegaΩ 
C)   663  Ω\OmegaΩ 
D)   480  Ω\OmegaΩ 
E)   960  Ω\OmegaΩF) B) and E)
G) None of the above

Question 8

A series RLC circuit has R = 200  Ω\OmegaΩ , L = 40.0 mH, and C = 120 pF.What is the impedance of this circuit at resonance?

Accepted Answer

A)   18.0 k Ω\OmegaΩ 
B)   36.0 k Ω\OmegaΩ 
C)   400  Ω\OmegaΩ 
D)   300  Ω\OmegaΩ 
E)   200  Ω\OmegaΩF) B) and D)
G) C) and D)

Question 9

What is the rms current for an 8.0  μ\muμ F capacitor attached to a 120 V rms 60 Hz source?

Accepted Answer

A)   2.8 A
B)   1.4 A
C)   0.72 A
D)   0.36 A
E)   0.18 A F) B) and E)
G) C) and E)

Question 10

In an ac circuit,the current in a capacitor

Accepted Answer

A)   leads the voltage by 90 ∘\circ∘ .
B)   lags the voltage by 90 ∘\circ∘ .
C)   is in phase with the voltage.
D)   leads the voltage by  π\piπ radians.
E)   lags the voltage by  π\piπ  radians. F) A) and B)
G) A) and C)

Question 11

An ideal diode in an ac circuit

Accepted Answer

A)   doubles the current.
B)   halves the current.
C)   permits the current to flow in only one direction.
D)   permits the current to flow in one direction and double the current to flow in the other.
E)   permits the current to flow in one direction and half the current to flow in the other.F) A) and E)
G) D) and E)

Question 12

An RLC series circuit has a 400  Ω\OmegaΩ  resistance,a 2.50 mH inductor,and a capacitor.If the circuit is in resonance at 30.0 kHz and is attached to a 20 mV rms power supply,what is the rms current?

Accepted Answer

A)   60  μ\muμ A
B)   40  μ\muμ A
C)   30  μ\muμ A
D)   50  μ\muμ A
E)   25  μ\muμ A F) A) and B)
G) D) and E)

Question 13

At what frequency is the reactance of a 20.0 mH inductor equal to 18.8  Ω\OmegaΩ .

Accepted Answer

A)   75.0 Hz
B)   150 Hz
C)   1500 Hz
D)   15.0 Hz E) A) and D)
F) A) and B)

Question 14

If an AC circuit consists of a 220 mH inductor in series with a 25 pF capacitor and an AC generator with rms voltage of 12 V.If the frequency of the generator is 55 kHz,what will the rms voltage drop across the capacitor be?

Accepted Answer

A)   5.4 V
B)   0.20 V
C)   6.6 V
D)   11.80 VE) B) and D)
F) B) and C)

Question 15

A series RLC ac circuit has a capacitive reactance of 55  Ω\OmegaΩ ,and inductive reactance of 25  Ω\OmegaΩ ,and a resistance of 40  Ω\OmegaΩ .What is the impedance of this circuit?

Accepted Answer

A)   12  Ω\OmegaΩ 
B)   95  Ω\OmegaΩ 
C)   70  Ω\OmegaΩ 
D)   10  Ω\OmegaΩ 
E)   50  Ω\OmegaΩF) A) and E)
G) None of the above

Question 16

What is maximum number 150 W light bulbs that can run on a 130 V circuit protected by a 20 amp circuit breaker?

Accepted Answer

A)   18
B)   16
C)   17
D)   15E) B) and D)
F) A) and B)

Question 17

A series LR circuit dissipates 60 W.The circuit is powered by a 120 V rms 60 Hz supply.If the current is 2.0 A rms,what is the inductance?

Accepted Answer

A)   0.10 H
B)   0.15 H
C)   0.20 H
D)   0.25 H
E)   0.30 HF) A) and E)
G) None of the above

Question 18

The difference between the highest and lowest voltage of a household "120 V emf" is

Accepted Answer

A)   120 V.
B)   170 V.
C)   240 V.
D)   340 V.
E)   377 V.F) A) and B)
G) A) and E)

Question 19

A lightbulb is connected to a 120 V(rms) ,60 Hz source.How many times per second does the current reverse directions?

Accepted Answer

A)   60
B)   130
C)   120
D)   30E) A) and B)
F) A) and C)

Question 20

The power factor of an RLC series circuit _______ at resonance.

Accepted Answer

A)   is one
B)   has a value that depends upon the ratio of inductive reactance to impedance
C)   has a value that depends upon the ratio of capacitive reactance to impedance
D)   is zeroE) C) and D)
F) None of the above

Exam 21: Alternating Current

As the ac frequency in an RLC circuit is increased to very high values,which of the contributions to the impedance dominates?

Correct AnswerverifiedShow Answer

A series RLC circuit has R = 200 Ω\OmegaΩ , L = 40.0 mH, and C = 120 pF.What is the impedance of this circuit at resonance?

Correct AnswerverifiedShow Answer

What is maximum number 150 W light bulbs that can run on a 130 V circuit protected by a 20 amp circuit breaker?

Correct AnswerverifiedShow Answer

At what frequency is the reactance of a 20.0 mH inductor equal to 18.8 Ω\OmegaΩ .

Correct AnswerverifiedShow Answer

What is the capacitive reactance of an 8.00 μ\muμ F V capacitor attached to 120 V rms at 60.0 Hz?

Correct AnswerverifiedShow Answer

The difference between the highest and lowest voltage of a household "120 V emf" is

Correct AnswerverifiedShow Answer

In an ac circuit,the current in a capacitor

Correct AnswerverifiedShow Answer

What is the rms current for an 8.0 μ\muμ F capacitor attached to a 120 V rms 60 Hz source?

Correct AnswerverifiedShow Answer

The inductive reactance of an RLC circuit is 36 Ω\OmegaΩ .If the frequency is doubled,what is the new inductive reactance?

Correct AnswerverifiedShow Answer

What inductance is needed in series with a 4.7 μ\muμ F capacitor for a resonant frequency of 10 kHz?

Correct AnswerverifiedShow Answer

The power factor of an RLC series circuit _______ at resonance.

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A lightbulb is connected to a 120 V(rms) ,60 Hz source.How many times per second does the current reverse directions?

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A series RLC ac circuit has a capacitive reactance of 55 Ω\OmegaΩ ,and inductive reactance of 25 Ω\OmegaΩ ,and a resistance of 40 Ω\OmegaΩ .What is the impedance of this circuit?

Correct AnswerverifiedShow Answer

If an AC circuit consists of a 220 mH inductor in series with a 25 pF capacitor and an AC generator with rms voltage of 12 V.If the frequency of the generator is 55 kHz,what will the rms voltage drop across the capacitor be?

Correct AnswerverifiedShow Answer

A 2.2 k Ω\OmegaΩ resistor and a 2.0 μ\muμ F capacitor are in series in an ac circuit.The rms voltages across each are equal.What is the frequency?

Correct AnswerverifiedShow Answer

In a series LRC circuit the rms voltage across the resistor is 80.0 V,across the capacitor is 120 V,and across the inductor is 60.0 V.What is the rms voltage applied to this circuit?

Correct AnswerverifiedShow Answer

An RLC series circuit has a 400 Ω\OmegaΩ resistance,a 2.50 mH inductor,and a capacitor.If the circuit is in resonance at 30.0 kHz and is attached to a 20 mV rms power supply,what is the rms current?

Correct AnswerverifiedShow Answer

An ideal diode in an ac circuit

Correct AnswerverifiedShow Answer

A series LR circuit dissipates 60 W.The circuit is powered by a 120 V rms 60 Hz supply.If the current is 2.0 A rms,what is the inductance?

Correct AnswerverifiedShow Answer

In a series LRC circuit the rms voltage across the resistor is 80 V,across the capacitor is 120 V,and across the inductor is 60 V.What is the phase constant for this circuit?

Correct AnswerverifiedShow Answer

Correct Answer
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A series RLC circuit has R = 200 $\Omega$ , L = 40.0 mH, and C = 120 pF.What is the impedance of this circuit at resonance?

Correct Answer
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Correct Answer
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At what frequency is the reactance of a 20.0 mH inductor equal to 18.8 $\Omega$ .

Correct Answer
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What is the capacitive reactance of an 8.00 $\mu$ F V capacitor attached to 120 V rms at 60.0 Hz?

Correct Answer
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Correct Answer
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Correct Answer
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What is the rms current for an 8.0 $\mu$ F capacitor attached to a 120 V rms 60 Hz source?

Correct Answer
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The inductive reactance of an RLC circuit is 36 $\Omega$ .If the frequency is doubled,what is the new inductive reactance?

Correct Answer
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What inductance is needed in series with a 4.7 $\mu$ F capacitor for a resonant frequency of 10 kHz?

Correct Answer
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Correct Answer
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Correct Answer
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A series RLC ac circuit has a capacitive reactance of 55 $\Omega$ ,and inductive reactance of 25 $\Omega$ ,and a resistance of 40 $\Omega$ .What is the impedance of this circuit?

Correct Answer
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Correct Answer
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A 2.2 k $\Omega$ resistor and a 2.0 $\mu$ F capacitor are in series in an ac circuit.The rms voltages across each are equal.What is the frequency?

Correct Answer
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Correct Answer
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An RLC series circuit has a 400 $\Omega$ resistance,a 2.50 mH inductor,and a capacitor.If the circuit is in resonance at 30.0 kHz and is attached to a 20 mV rms power supply,what is the rms current?

Correct Answer
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Correct Answer
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Correct Answer
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Correct Answer
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