Question 1

The selectivity of a given band-pass filter has degraded significantly, yet the fr is within tolerance. Which of the following could have caused this?

Accepted Answer

A)  The inductance has increased.
B)  The load has opened.
C)  The capacitance has increased.
D)  none of the aboveE) B) and C)
F) A) and C)

Question 2

-If frequency increases in Figure 13-1, the impedance ________ and the current ________.

Accepted Answer

A)  decreases, decreases
B)  increases, increases
C)  decreases, increases
D)  increases, decreasesE) None of the above
F) B) and C)

Question 3

If a tuned tank circuit has a very narrow bandwidth, its Q is probably ________.

Accepted Answer

A)  very low
B)  below 10
C)  about 10
D)  very highE) None of the above
F) A) and D)

Question 4

-What is the resonant frequency of a tank circuit with a 50 mH inductor and C = 256 pF capacitor?

Accepted Answer

A)  44.5 kHz
B)  44.5 Hz
C)  445 kHz
D)  4.45 kHzE) A) and B)
F) A) and C)

Question 5

The output voltage of a circuit at 70.7% of its maximum level measured in dB is:

Accepted Answer

A)  -3 dB.
B)  -7 db.
C)  7 dB.
D)  3 dB.E) None of the above
F) B) and D)

Question 6

The capacitorʹs resistive effects are significant when considering the  of an RLC circuit.

Accepted Answer

A) True 
 B)False  False

Question 7

What is the power at  in a resonant circuit that delivers 120 W?

Accepted Answer

A)   
B)  84.8 W
C)  60 W
D)  17 W at both frequenciesE) A) and B)
F) A) and D)

Question 8

-If the frequency decreases in Figure 13-1, the impedance ________ and the phase angle ________.

Accepted Answer

A)  increases, increases
B)  decreases, decreases
C)  decreases, increases
D)  increases, decreasesE) A) and C)
F) None of the above

Question 9

A resonant RLC circuit is said to be very selective if its  is very low.

Accepted Answer

A) True 
 B)False

Question 10

Current leads in a series RLC circuit with more capacitive reactance than inductive reactance.

Accepted Answer

A) True 
 B)False

Question 11

-Find the voltage across the capacitor in Figure 13-1.

Accepted Answer

A)  10.7 V
B)  0.633 V
C)  -4.9 V
D)  5.37 VE) B) and D)
F) A) and C)

Question 12

In a parallel resonant RLC circuit, the impedance is ________ and the total current is ________.

Accepted Answer

A)  maximum. maximum
B)  minimum, minimum
C)  minimum, maximum
D)  maximum, minimumE) A) and B)
F) C) and D)

Question 13

What is the source voltage in a series resonant circuit if

Accepted Answer

A)  300 V
B)  50 V
C)  350 V
D)  150 VE) None of the above
F) A) and D) B

Question 14

At resonance, a parallel RLC circuit is inductive.

Accepted Answer

A) True 
 B)False

Question 15

If a tuned tank circuit has a very wide bandwidth, its  might be ________.

Accepted Answer

A)  about 10
B)  about 100
C)  very high
D)  very lowE) All of the above
F) B) and D)

Question 16

-As the frequency approaches the resonant frequency in Figure 13-1, the VR

Accepted Answer

A)  becomes increasingly unstable
B)  increases
C)  remains the same
D)  decreasesE) B) and C)
F) A) and C)

Question 17

-If the resistor shorts in Figure 13-2, the current ________.

Accepted Answer

A)  increases
B)  continues, but the circuit would not be resonant
C)  decreases
D)  does not changeE) B) and C)
F) C) and D)

Question 18

In a series RLC circuit at resonance:

Accepted Answer

A)  the impedance is mostly resistive.
B)    equals  and they cancel.
C)  the impedance Z is at minimum.
D)  all of these.E) C) and D)
F) B) and D)

Question 19

Between the lower and upper critical frequencies of a band-pass filter:

Accepted Answer

A)  the frequencies pass a maximum level.
B)  the frequencies pass at 70% to their maximum levels.
C)  the frequencies pass a minimum level.
D)  the frequencies pass at 30% to their maximum levels.E) A) and B)
F) None of the above B

Question 20

The resonant frequency of a tank circuit with a 0.150 mH inductor and 300 pF capacitor is ________.

Accepted Answer

A)  1.65 MHz
B)  750 kHz
C)  6.05 MHz
D)  347 kHzE) B) and C)
F) B) and D)

Exam 13: Inductors

The selectivity of a given band-pass filter has degraded significantly, yet the fr is within tolerance. Which of the following could have caused this?

Correct AnswerverifiedShow Answer

-If frequency increases in Figure 13-1, the impedance ________ and the current ________.

Correct AnswerverifiedShow Answer

If a tuned tank circuit has a very narrow bandwidth, its Q is probably ________.

Correct AnswerverifiedShow Answer

-What is the resonant frequency of a tank circuit with a 50 mH inductor and C = 256 pF capacitor?

Correct AnswerverifiedShow Answer

The output voltage of a circuit at 70.7% of its maximum level measured in dB is:

Correct AnswerverifiedShow Answer

The capacitorʹs resistive effects are significant when considering the of an RLC circuit.

Correct AnswerverifiedFalse

What is the power at in a resonant circuit that delivers 120 W?

Correct AnswerverifiedShow Answer

-If the frequency decreases in Figure 13-1, the impedance ________ and the phase angle ________.

Correct AnswerverifiedShow Answer

A resonant RLC circuit is said to be very selective if its is very low.

Correct AnswerverifiedShow Answer

Current leads in a series RLC circuit with more capacitive reactance than inductive reactance.

Correct AnswerverifiedShow Answer

-Find the voltage across the capacitor in Figure 13-1.

Correct AnswerverifiedShow Answer

In a parallel resonant RLC circuit, the impedance is ________ and the total current is ________.

Correct AnswerverifiedShow Answer

What is the source voltage in a series resonant circuit if

Correct AnswerverifiedB

At resonance, a parallel RLC circuit is inductive.

Correct AnswerverifiedShow Answer

If a tuned tank circuit has a very wide bandwidth, its might be ________.

Correct AnswerverifiedShow Answer

-As the frequency approaches the resonant frequency in Figure 13-1, the VR

Correct AnswerverifiedShow Answer

-If the resistor shorts in Figure 13-2, the current ________.

Correct AnswerverifiedShow Answer

In a series RLC circuit at resonance:

Correct AnswerverifiedShow Answer

Between the lower and upper critical frequencies of a band-pass filter:

Correct AnswerverifiedB

The resonant frequency of a tank circuit with a 0.150 mH inductor and 300 pF capacitor is ________.

Correct AnswerverifiedShow Answer

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-If frequency increases in Figure 13-1, the impedance and the current .

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False

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-If the frequency decreases in Figure 13-1, the impedance and the phase angle .

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In a parallel resonant RLC circuit, the impedance is and the total current is .

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B

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B

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