Question 1

In a parallel RLC circuit just above the resonant frequency, the impedance is:

Accepted Answer

A) at minimum. 
B) at maximum. 
C) more capacitive. 
D) more inductive.

Question 2

A series RLC circuit can be configured for band-pass or band-stop filtering purposes.

Accepted Answer

A) True 
 B)False

Question 3

$$\text { Figure } 13 < 1$$
-Find the voltage across the capacitor in Figure 13-1.

Accepted Answer

A) 10.7V 
B) 0.633V 
C) -4.9V 
D) 5.37V

Question 4

Replacing the inductor in a series resonant band-pass filter with one having a lower $Q$  value causes the bandwidth to_________

Accepted Answer

A)  increase 
B)  remain the same 
C)  be more selective 
D)  decrease

Question 5

Why does a resistive load increase the bandwidth of a given band-pass filter?

Accepted Answer

A) A resistive load actually decreases the bandwidth. 
B) The resistance decreases the quality of the circuit. 
C) The resistance increases the quality of the circuit. 
D) not enough information

Question 6

$$\text { Figure } 13 < 2$$
-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 change

Question 7

If an LC tank circuit is operating below resonance, the circuit is ________ in nature.

Accepted Answer

A) inductive 
B) capacitive 
C) positive 
D) resistive

Question 8

If the resonant frequency is  1MHz and $Q$=50, f1= ________ and  f2= ________

Accepted Answer

A)   0.98 MHz, 1.01 MHz 
B)   0.98 MHz, 1.02 MHz 
C)   0.99 MHz, 1.02MHz 
D)   0.99 MHz, 1.01 MHz

Question 9

Which statement best describes the phase angle of a parallel RLC circuit at resonance?

Accepted Answer

A) With a net reactance at maximum the phase angle is zero. 
B) With a net reactance at minimum the phase angle is zero. 
C) Total current flow is minimum. 
D) either A or C

Question 10

When tuning across the resonant frequency of a series RLC band-pass filter,W hich of the following is true?

Accepted Answer

A) The impedance of the filter should be minimum at resonance. 
B) Current flow through the load is minimum. 
C) The outputVoltage across the load is minimum. 
D) The impedance of the filter should be maximum at resonance.

Question 11

At resonance, a series RLC circuit has maximum current.

Accepted Answer

A) True 
 B)False

Question 12

In a series RLC circuit at resonance:

Accepted Answer

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

Question 13

Current leads in a series RLC circuitW ith more capacitive reactance than inductive reactance.

Accepted Answer

A) True 
 B)False

Question 14

$$\text { Figure } 13 < 1$$
-If the resistance increases in Figure 13-1, the impedance ________.

Accepted Answer

A) becomes zero 
B) remains the same 
C) increases 
D) decreases

Question 15

$$\text { Figure } 13 < 1$$
-If the frequency decreases in Figure 13-1, the impedance initally ________ and the current initially ________.

Accepted Answer

A) decreases, increases 
B) increases, increases 
C) increases, decreases 
D) decreases, decreases

Question 16

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.

Question 17

$$\text { Figure } 13 < 1$$
-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, decreases

Question 18

What is the resonant impedance of a series RLC circuit with a  15 mH  inductor,  0.015$\mu \mathrm { F }$  capacitor and  80$\Omega$ resistor?

Accepted Answer

A)   30 $\Omega$ 
B)  15 $\mathrm { k } \Omega$ 
C)   80$\Omega$ 
D)  0 $\Omega$

Question 19

What is the bandwidth of the resonant circuit if the resonant frequency is  1.42 MHz , the inductive reactance is  3.5  $\mathrm { k } \Omega$ and the coil's resistance is  8 ohm  ?

Accepted Answer

A)   32.5 kHz 
B)   3.25 kHz 
C)   1.42 MHz 
D)   2285 Hz

Question 20

The total reactance of a series RLC circuit at resonance is ________.

Accepted Answer

A) infinity 
B) equal to the resistance 
C) capacitive 
D) zero

Exam 13: Rlc Circuits and Resonance

In a parallel RLC circuit just above the resonant frequency, the impedance is:

A series RLC circuit can be configured for band-pass or band-stop filtering purposes.

$\text { Figure } 13 < 1 -Find the voltage across the capacitor in Figure 13-1. A) 10.7V B) 0.633V C) -4.9V D) 5.37V$ $\text { Figure } 13 < 1$ -Find the voltage across the capacitor in Figure 13-1.

Replacing the inductor in a series resonant band-pass filter with one having a lower $Q$ value causes the bandwidth to_________

Why does a resistive load increase the bandwidth of a given band-pass filter?

$\text { Figure } 13 < 2 -If the resistor shorts in Figure 13-2, the current . A) increases B) continues, but the circuit Would not be resonant C) decreases D) does not change$ $\text { Figure } 13 < 2$ -If the resistor shorts in Figure 13-2, the current .

If an LC tank circuit is operating below resonance, the circuit is ________ in nature.

If the resonant frequency is 1MHz and $Q$ =50, f1= and f2=

Which statement best describes the phase angle of a parallel RLC circuit at resonance?

When tuning across the resonant frequency of a series RLC band-pass filter,W hich of the following is true?

At resonance, a series RLC circuit has maximum current.

In a series RLC circuit at resonance:

Current leads in a series RLC circuitW ith more capacitive reactance than inductive reactance.

$\text { Figure } 13 < 1 -If the resistance increases in Figure 13-1, the impedance . A) becomes zero B) remains the same C) increases D) decreases$ $\text { Figure } 13 < 1$ -If the resistance increases in Figure 13-1, the impedance .

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

$\text { Figure } 13 < 1 -If frequency increases in Figure 13-1, the impedance and the current . A) decreases, decreases B) increases, increases C) decreases, increases D) increases, decreases$ $\text { Figure } 13 < 1$ -If frequency increases in Figure 13-1, the impedance and the current .

What is the resonant impedance of a series RLC circuit with a 15 mH inductor, 0.015 $\mu \mathrm { F }$ capacitor and 80 $\Omega$ resistor?

What is the bandwidth of the resonant circuit if the resonant frequency is 1.42 MHz , the inductive reactance is 3.5 $\mathrm { k } \Omega$ and the coil's resistance is 8 ohm ?

The total reactance of a series RLC circuit at resonance is ________.

Exam 13: Rlc Circuits and Resonance

In a parallel RLC circuit just above the resonant frequency, the impedance is:

A series RLC circuit can be configured for band-pass or band-stop filtering purposes.

Figure 13<1\text { Figure } 13 < 1 Figure 13<1 -Find the voltage across the capacitor in Figure 13-1.

Replacing the inductor in a series resonant band-pass filter with one having a lower QQQ value causes the bandwidth to_________

Why does a resistive load increase the bandwidth of a given band-pass filter?

Figure 13<2\text { Figure } 13 < 2 Figure 13<2 -If the resistor shorts in Figure 13-2, the current ________.

If an LC tank circuit is operating below resonance, the circuit is ________ in nature.

If the resonant frequency is 1MHz and QQQ =50, f1= ________ and f2= ________

Which statement best describes the phase angle of a parallel RLC circuit at resonance?

When tuning across the resonant frequency of a series RLC band-pass filter,W hich of the following is true?

At resonance, a series RLC circuit has maximum current.

In a series RLC circuit at resonance:

Current leads in a series RLC circuitW ith more capacitive reactance than inductive reactance.

Figure 13<1\text { Figure } 13 < 1 Figure 13<1 -If the resistance increases in Figure 13-1, the impedance ________.

Figure 13<1\text { Figure } 13 < 1 Figure 13<1 -If the frequency decreases in Figure 13-1, the impedance initally ________ and the current initially ________.

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

Figure 13<1\text { Figure } 13 < 1 Figure 13<1 -If frequency increases in Figure 13-1, the impedance ________ and the current ________.

What is the resonant impedance of a series RLC circuit with a 15 mH inductor, 0.015 μF\mu \mathrm { F }μF capacitor and 80 Ω\OmegaΩ resistor?

What is the bandwidth of the resonant circuit if the resonant frequency is 1.42 MHz , the inductive reactance is 3.5 kΩ\mathrm { k } \OmegakΩ and the coil's resistance is 8 ohm ?

The total reactance of a series RLC circuit at resonance is ________.

$\text { Figure } 13 < 1 -Find the voltage across the capacitor in Figure 13-1. A) 10.7V B) 0.633V C) -4.9V D) 5.37V$ $\text { Figure } 13 < 1$ -Find the voltage across the capacitor in Figure 13-1.

Replacing the inductor in a series resonant band-pass filter with one having a lower $Q$ value causes the bandwidth to_________

$\text { Figure } 13 < 2 -If the resistor shorts in Figure 13-2, the current . A) increases B) continues, but the circuit Would not be resonant C) decreases D) does not change$ $\text { Figure } 13 < 2$ -If the resistor shorts in Figure 13-2, the current .

If the resonant frequency is 1MHz and $Q$ =50, f1= and f2=

$\text { Figure } 13 < 1 -If the resistance increases in Figure 13-1, the impedance . A) becomes zero B) remains the same C) increases D) decreases$ $\text { Figure } 13 < 1$ -If the resistance increases in Figure 13-1, the impedance .

$\text { Figure } 13 < 1 -If frequency increases in Figure 13-1, the impedance and the current . A) decreases, decreases B) increases, increases C) decreases, increases D) increases, decreases$ $\text { Figure } 13 < 1$ -If frequency increases in Figure 13-1, the impedance and the current .

What is the resonant impedance of a series RLC circuit with a 15 mH inductor, 0.015 $\mu \mathrm { F }$ capacitor and 80 $\Omega$ resistor?

What is the bandwidth of the resonant circuit if the resonant frequency is 1.42 MHz , the inductive reactance is 3.5 $\mathrm { k } \Omega$ and the coil's resistance is 8 ohm ?