Question 1

Figure 17-1
-If the series circuit in Figure 17-1 is resonant, the circuit is purely resistive and the phase shift is zero degrees.

Accepted Answer

A) True 
 B)False  True

Question 2

-The capacitive reactance in Figure  is:

Accepted Answer

A)  159.7 Ω 
B)  26.53 Ω 
C)  265.3 Ω 
D)  2.7 kΩ 
A)  159.7 Ω 
B)  26.53 Ω 
C)  265.3 Ω 
D)  2.7 kΩ C

Question 3

Resonant frequency of a circuit occurs when the inductive reactance is equal to the capacitive reactance.

Accepted Answer

A) True 
 B)False  True

Question 4

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

Accepted Answer

A) True 
 B)False

Question 5

-If the parallel circuit in Figure  is resonant, the inductive and capacitive reactance must be equal.

Accepted Answer

A) True 
 B)False

Question 6

Figure 17-1
-If the series circuit in Figure 17-1 is NOT resonant, the impedance will be lower than it is at the resonant frequency.

Accepted Answer

A) True 
 B)False

Question 7

-Is the circuit in Figure 17-7 at or near resonance?

Accepted Answer

A)  No 
B)  Yes 
A)  No 
B)  Yes

Question 8

-The current through the resistor in Figure  is:

Accepted Answer

A)  459.65 mA 
B)  15.9 A 
C)  350 mA 
D)  3.48 A 
A)  459.65 mA 
B)  15.9 A 
C)  350 mA 
D)  3.48 A

Question 9

Half-power frequencies

Accepted Answer

A)  determine the pass band. 
B)  determine bandwidth. 
C)  determine selectivity. 
D)  all of the above 
E)  none of the above 
A)  determine the pass band. 
B)  determine bandwidth. 
C)  determine selectivity. 
D)  all of the above 
E)  none of the above

Question 10

-Given the circuit in Figure 17-5, the circuit current is:

Accepted Answer

A)  7.64 mA 
B)  36.9 mA 
C)  0.1 A 
D)  3.03 mA 
A)  7.64 mA 
B)  36.9 mA 
C)  0.1 A 
D)  3.03 mA

Question 11

-Given the circuit in Figure 17-5, the circuit phase angle is:

Accepted Answer

A)  90° 
B)  34.5° 
C)  -5.4° 
D)  -1.3° 
A)  90° 
B)  34.5° 
C)  -5.4° 
D)  -1.3°

Question 12

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

Accepted Answer

A)  690 Ω 
B)  100 Ω 
C)  318 Ω 
D)  345 Ω 
A)  690 Ω 
B)  100 Ω 
C)  318 Ω 
D)  345 Ω

Question 13

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

Accepted Answer

A)  1 A 
B)  198 µA 
C)  0.87 mA 
D)  100 mA 
A)  1 A 
B)  198 µA 
C)  0.87 mA 
D)  100 mA

Question 14

-The phase shift between the source voltage VS and total circuit current in Figure is:

Accepted Answer

A)  -46.45° 
B)  23.4° 
C)  -23.4° 
D)  -76.8° 
A)  -46.45° 
B)  23.4° 
C)  -23.4° 
D)  -76.8°

Question 15

-In Figure 17-8, calculate IT.

Accepted Answer

A)  157 A 2-71.4° 
B)  464 A 2-39° 
C)  157 A 271.4° 
D)  464 A 239° 
A)  157 A 2-71.4° 
B)  464 A 2-39° 
C)  157 A 271.4° 
D)  464 A 239°

Question 16

At frequencies well above and below the resonant frequency, the series RLC circuit looks above resonance, and the parallel RLC circuit looks below resonance.

Accepted Answer

A)  like an open, like a short 
B)  like a short, like an open 
C)  inductive, inductive 
D)  inductive, capacitive 
A)  like an open, like a short 
B)  like a short, like an open 
C)  inductive, inductive 
D)  inductive, capacitive

Question 17

In a series resonant circuit, current is maximum and impedance is minimum at resonance.

Accepted Answer

A) True 
 B)False

Question 18

-The Total circuit current in Figure is:

Accepted Answer

A)  4.3 A 
B)  14.87 A 
C)  15.2 A 
D)  3.5 A 
A)  4.3 A 
B)  14.87 A 
C)  15.2 A 
D)  3.5 A

Question 19

Apparent power in an RLC circuit is equal to total voltage times total current when:

Accepted Answer

A)  the circuit is not at resonance 
B)  the circuit is at resonance. 
C)  it is a series or parallel circuit 
D)  all of the above 
A)  the circuit is not at resonance 
B)  the circuit is at resonance. 
C)  it is a series or parallel circuit 
D)  all of the above

Question 20

-The True power in Figure  is:

Accepted Answer

A)  200.7 W 
B)  7.5 W 
C)  43.29 W 
D)  401 W 
A)  200.7 W 
B)  7.5 W 
C)  43.29 W 
D)  401 W

Exam 17: Rlc Circuits and Resonance

Figure 17-1 -If the series circuit in Figure 17-1 is resonant, the circuit is purely resistive and the phase shift is zero degrees.

-The capacitive reactance in Figure is:

Resonant frequency of a circuit occurs when the inductive reactance is equal to the capacitive reactance.

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

-If the parallel circuit in Figure is resonant, the inductive and capacitive reactance must be equal.

Figure 17-1 -If the series circuit in Figure 17-1 is NOT resonant, the impedance will be lower than it is at the resonant frequency.

-Is the circuit in Figure 17-7 at or near resonance?

-The current through the resistor in Figure is:

Half-power frequencies

-Given the circuit in Figure 17-5, the circuit current is:

-Given the circuit in Figure 17-5, the circuit phase angle is:

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

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

-The phase shift between the source voltage VS and total circuit current in Figure is:

-In Figure 17-8, calculate IT.

At frequencies well above and below the resonant frequency, the series RLC circuit looks above resonance, and the parallel RLC circuit looks below resonance.

In a series resonant circuit, current is maximum and impedance is minimum at resonance.

-The Total circuit current in Figure is:

Apparent power in an RLC circuit is equal to total voltage times total current when:

-The True power in Figure is:

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

-The phase shift between the source voltage V_S and total circuit current in Figure is: