Question 1

An equivalent circuit is one that produces the same voltage and current to a given load as the original circuit it replaces.

Accepted Answer

A) True 
 B)False

Question 2

In order to get maximum power transfer from a capacitive source, the load must have an impedance that is the complex conjugate of the source impedance.

Accepted Answer

A) True 
 B)False

Question 3

When using the superposition theorem in ac network analysis, which one of the following statements is not true?

Accepted Answer

A)  All impedances are replaced by their complex conjugates. 
B)  Current sources are replaced by short circuits. 
C)  Voltage sources are replaced by open circuits. 
D)  Voltage sources are replaced by short circuits. 
A)  All impedances are replaced by their complex conjugates. 
B)  Current sources are replaced by short circuits. 
C)  Voltage sources are replaced by open circuits. 
D)  Voltage sources are replaced by short circuits.

Question 4

-See Figure 19-6. What is the Norton equivalent current In external to ZL?

Accepted Answer

A)  0.89 A 23.4° 
B)  0.67 A 226.6° 
C)  0.67 A 230° 
D)  0 A 20° 
A)  0.89 A 23.4° 
B)  0.67 A 226.6° 
C)  0.67 A 230° 
D)  0 A 20°

Question 5

Figure 19-5
-See Figure 19-5. Using the superposition theorem, what is the portion of the current through the capacitor caused by the 10 V 20° voltage source?

Accepted Answer

A)  0.822 A 29.5° 
B)  0.616 A 2129.5° 
C)  0.741 A 255.6° 
D)  0.5 A 290° 
A)  0.822 A 29.5° 
B)  0.616 A 2129.5° 
C)  0.741 A 255.6° 
D)  0.5 A 290°

Question 6

When the load is properly chosen for maximum power transfer, the load will appear .

Accepted Answer

A)  imaginary 
B)  reactive 
C)  complex 
D)  totally resistive 
A)  imaginary 
B)  reactive 
C)  complex 
D)  totally resistive

Question 7

Figure 19-2
-Given the circuit in Figure 19-2, find the total current in the load RL).

Accepted Answer

A)  3.39 247° mA on a dc level of 8 mA 
B)  4 mA 
C)  1.69 247.3° mA 
D)  5.69 247° mA 
A)  3.39 247° mA on a dc level of 8 mA 
B)  4 mA 
C)  1.69 247.3° mA 
D)  5.69 247° mA

Question 8

To find Vth, determine the between the two specified terminals.

Accepted Answer

A)  short circuit current 
B)  open circuit current 
C)  open circuit voltage 
D)  short circuit voltage 
A)  short circuit current 
B)  open circuit current 
C)  open circuit voltage 
D)  short circuit voltage

Question 9

Assume you need to find the total impedance between two specific terminals, looking into the open terminals, with all sources zeroed. Which theorem is suggested by these conditions?

Accepted Answer

A)  Norton's theorem 
B)  Thevenin's theorem 
C)  total impedance 
D)  both A and B 
A)  Norton's theorem 
B)  Thevenin's theorem 
C)  total impedance 
D)  both A and B

Question 10

-What is the Norton equivalent impedance Zn external to ZL?

Accepted Answer

A)  10.0 $\Omega \angle$
 0° 
B)  5.0$\Omega \angle$
 90° 
C)  0.47 $\Omega \angle$
 -26.6° 
D)  11.2 $\Omega \angle$
 26.6° 
A)  10.0 $\Omega \angle$
 0° 
B)  5.0$\Omega \angle$
 90° 
C)  0.47 $\Omega \angle$
 -26.6° 
D)  11.2 $\Omega \angle$
 26.6°

Question 11

The superposition theorem is useful for the analysis of single source-circuits.

Accepted Answer

A) True 
 B)False

Question 12

The only difference in applying network theorems to ac circuits rather than dc circuits is that we will be working with and instead of just resistors and real numbers.

Accepted Answer

A)  impedances, vectors 
B)  currents, shorts 
C)  voltages, loads 
D)  impedances, phasors 
A)  impedances, vectors 
B)  currents, shorts 
C)  voltages, loads 
D)  impedances, phasors

Question 13

The Norton equivalent circuit and Thevenin equivalent circuit can be found from each other by using .

Accepted Answer

A)  a source transformation 
B)  the voltage divider rule 
C)  Kirchhoff's law 
D)  Ohm's law 
A)  a source transformation 
B)  the voltage divider rule 
C)  Kirchhoff's law 
D)  Ohm's law

An equivalent circuit is one that produces the same voltage and current to a given load as the original circuit it replaces.

In order to get maximum power transfer from a capacitive source, the load must have an impedance that is the complex conjugate of the source impedance.

When using the superposition theorem in ac network analysis, which one of the following statements is not true?

-See Figure 19-6. What is the Norton equivalent current In external to ZL?

Figure 19-5 -See Figure 19-5. Using the superposition theorem, what is the portion of the current through the capacitor caused by the 10 V 20° voltage source?

When the load is properly chosen for maximum power transfer, the load will appear .

Figure 19-2 -Given the circuit in Figure 19-2, find the total current in the load RL).

To find Vth, determine the between the two specified terminals.

Assume you need to find the total impedance between two specific terminals, looking into the open terminals, with all sources zeroed. Which theorem is suggested by these conditions?

-What is the Norton equivalent impedance Zn external to ZL?

The superposition theorem is useful for the analysis of single source-circuits.

The only difference in applying network theorems to ac circuits rather than dc circuits is that we will be working with and instead of just resistors and real numbers.

The Norton equivalent circuit and Thevenin equivalent circuit can be found from each other by using .

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

Rlc Circuits and Resonance

Passive Filters

Time Response of Reactive Circuits

Three-Phase Systems in Power Applications

Filters

Exam 19: Circuit Theorems in Ac Analysis

An equivalent circuit is one that produces the same voltage and current to a given load as the original circuit it replaces.

In order to get maximum power transfer from a capacitive source, the load must have an impedance that is the complex conjugate of the source impedance.

When using the superposition theorem in ac network analysis, which one of the following statements is not true?

-See Figure 19-6. What is the Norton equivalent current In external to ZL?

Figure 19-5 -See Figure 19-5. Using the superposition theorem, what is the portion of the current through the capacitor caused by the 10 V 20° voltage source?

When the load is properly chosen for maximum power transfer, the load will appear .

Figure 19-2 -Given the circuit in Figure 19-2, find the total current in the load RL).

To find Vth, determine the between the two specified terminals.

Assume you need to find the total impedance between two specific terminals, looking into the open terminals, with all sources zeroed. Which theorem is suggested by these conditions?

-What is the Norton equivalent impedance Zn external to ZL?

The superposition theorem is useful for the analysis of single source-circuits.

The only difference in applying network theorems to ac circuits rather than dc circuits is that we will be working with and instead of just resistors and real numbers.

The Norton equivalent circuit and Thevenin equivalent circuit can be found from each other by using .

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

Rlc Circuits and Resonance

Passive Filters

Time Response of Reactive Circuits

Three-Phase Systems in Power Applications

Filters