Question 1

-Given the circuit in Figure , the circuit impedance is:

Accepted Answer

A)  5.88 Ω 
B)  6.4 Ω 
C)  14.46 Ω 
D)  8.1 Ω 
A)  5.88 Ω 
B)  6.4 Ω 
C)  14.46 Ω 
D)  8.1 Ω

Question 2

The center frequency of a band-pass filter is always equal to the .

Accepted Answer

A)  geometric mean average of the cutoff frequencies 
B)  3-dB frequency 
C)  bandwidth divided by Q 
D)  bandwidth 
A)  geometric mean average of the cutoff frequencies 
B)  3-dB frequency 
C)  bandwidth divided by Q 
D)  bandwidth

Question 3

- calculate VL across the 5Ω inductive reactance

Accepted Answer

A)  95.0 V  39° 
B)  33.9 V   -58° 
C)  95.0 V   -39° 
D)  33.9 V   58° 
A)  95.0 V  39° 
B)  33.9 V   -58° 
C)  95.0 V   -39° 
D)  33.9 V   58°

Question 4

-The current through the capacitor in Figure is:

Accepted Answer

A)  159.7 mA 
B)  434 mA 
C)  279.65 mA 
D)  4.3 A 
A)  159.7 mA 
B)  434 mA 
C)  279.65 mA 
D)  4.3 A

Question 5

-If the parallel circuit in Figure is resonant, the circuit is purely resistive and the phase shift is zero degrees.

Accepted Answer

A) True 
 B)False

Question 6

-If the parallel circuit in Figure is resonant, the impedance, as seen by the generator will be very high.

Accepted Answer

A) True 
 B)False

Question 7

A series resonant circuit has a low impedance at the resonant frequency.

Accepted Answer

A) True 
 B)False

Question 8

-The inductive reactance in Figure  is:

Accepted Answer

A)  2.7 kΩ 
B)  750 Ω 
C)  2.6 Ω 
D)  7.5 Ω 
A)  2.7 kΩ 
B)  750 Ω 
C)  2.6 Ω 
D)  7.5 Ω

Question 9

-The current through the inductor in Figure is:

Accepted Answer

A)  27.9 A 
B)  15.3 A 
C)  153 mA 
D)  1.5 A 
A)  27.9 A 
B)  15.3 A 
C)  153 mA 
D)  1.5 A

Question 10

Figure 17-1
-If the series circuit in Figure 17-1 is resonant, increasing the Q will produce a wider bandwidth.

Accepted Answer

A) True 
 B)False

Question 11

Figure 17-1
-If the series circuit in Figure 17-1 is resonant, the impedance, as seen by the generator will be very high.

Accepted Answer

A) True 
 B)False

Question 12

In a series LC circuit, L = 100 µH, C = 0.047 µF, and f = 150 kHz. The value of ZT is:

Accepted Answer

A)  72 $\Omega \angle$
 90° 
B)  36 $\Omega \angle$
 45° 
C)  -72 $\Omega \angle$
 -90° 
D)  72 $\Omega \angle$
 -90° 
A)  72 $\Omega \angle$
 90° 
B)  36 $\Omega \angle$
 45° 
C)  -72 $\Omega \angle$
 -90° 
D)  72 $\Omega \angle$
 -90°

Question 13

If the bandwidth of a filter increases, .

Accepted Answer

A)  ripples appear in the stopband 
B)  the roll-off rate increases 
C)  Q decreases 
D)  the center frequency decreases 
A)  ripples appear in the stopband 
B)  the roll-off rate increases 
C)  Q decreases 
D)  the center frequency decreases

Question 14

In a series RLC circuit, above resonance the circuit is more capacitive than it is inductive.

Accepted Answer

A) True 
 B)False

Question 15

-If the parallel circuit in Figure is resonant, increasing the Q will produce a wider bandwidth.

Accepted Answer

A) True 
 B)False

Question 16

-In Figure 17-8, calculate VC.

Accepted Answer

A)  40 V 260° 
B)  40 V 2-60° 
C)  120 V 2-90° 
D)  120 V 290° 
A)  40 V 260° 
B)  40 V 2-60° 
C)  120 V 2-90° 
D)  120 V 290°

Question 17

-Given the circuit in Figure 17-4, is the circuit mostly inductive or capacitive?

Accepted Answer

A)  capacitive 
B)  inductive 
A)  capacitive 
B)  inductive

Question 18

The lower and upper end of the band width of a series RLC circuit is where the current has fallen to of the maximum.

Accepted Answer

A)  70.7% 
B)  63.6% 
C)  29.3% 
D)  50% 
A)  70.7% 
B)  63.6% 
C)  29.3% 
D)  50%

Question 19

-Given the circuit in Figure , the circuit impedance is:

Accepted Answer

A)  3.3 kΩ 
B)  6.94 kΩ 
C)  27.1 kΩ 
D)  7.07 kΩ 
A)  3.3 kΩ 
B)  6.94 kΩ 
C)  27.1 kΩ 
D)  7.07 kΩ

Question 20

-In Figure 17-8, calculate VR.

Accepted Answer

A)  33.9 V 2-58° 
B)  95.0 V 2-39° 
C)  33.9 V 258° 
D)  95.0 V 239° 
A)  33.9 V 2-58° 
B)  95.0 V 2-39° 
C)  33.9 V 258° 
D)  95.0 V 239°

Exam 17: Rlc Circuits and Resonance

-Given the circuit in Figure , the circuit impedance is:

The center frequency of a band-pass filter is always equal to the .

- calculate VL across the 5Ω inductive reactance

-The current through the capacitor in Figure is:

-If the parallel circuit in Figure is resonant, the circuit is purely resistive and the phase shift is zero degrees.

-If the parallel circuit in Figure is resonant, the impedance, as seen by the generator will be very high.

A series resonant circuit has a low impedance at the resonant frequency.

-The inductive reactance in Figure is:

-The current through the inductor in Figure is:

Figure 17-1 -If the series circuit in Figure 17-1 is resonant, increasing the Q will produce a wider bandwidth.

Figure 17-1 -If the series circuit in Figure 17-1 is resonant, the impedance, as seen by the generator will be very high.

In a series LC circuit, L = 100 µH, C = 0.047 µF, and f = 150 kHz. The value of ZT is:

If the bandwidth of a filter increases, .

In a series RLC circuit, above resonance the circuit is more capacitive than it is inductive.

-If the parallel circuit in Figure is resonant, increasing the Q will produce a wider bandwidth.

-In Figure 17-8, calculate VC.

-Given the circuit in Figure 17-4, is the circuit mostly inductive or capacitive?

The lower and upper end of the band width of a series RLC circuit is where the current has fallen to of the maximum.

-Given the circuit in Figure , the circuit impedance is:

-In Figure 17-8, calculate VR.

Quantities and Units

Voltage, Current, and Resistance

Ohms Law

Energy and Power

Series Circuits

Parallel Circuits

Series-Parallel Circuits

Circuit Theorems and Conversions

Branch, Loop, and Node Analyses

Magnetism and Electromagnetism

Introduction to Alternating Current and Voltage

Capacitors

Inductors

Transformers

Rc Circuits

Rl Circuits

Passive Filters

Circuit Theorems in Ac Analysis

Time Response of Reactive Circuits

Three-Phase Systems in Power Applications

Filters