Question 1

In a series resistor/inductor circuit:

Accepted Answer

A)  the same current flows through both the resistor and the inductor. 
B)  the resistor voltage is in phase with the current. 
C)  the inductor voltage leads the current by 90 degrees. 
D)  All of the above are correct. 
A)  the same current flows through both the resistor and the inductor. 
B)  the resistor voltage is in phase with the current. 
C)  the inductor voltage leads the current by 90 degrees. 
D)  All of the above are correct.

Question 2

In a series RL circuit, if resistance increases, impedance will:

Accepted Answer

A)  increase 
B)  drop to zero 
C)  decrease 
D)  remain the same. 
A)  increase 
B)  drop to zero 
C)  decrease 
D)  remain the same.

Question 3

What is the Impedance of the circuit in Figure , expressed in rectangular form?

Accepted Answer

A)  75 Ω + j120 Ω 
B)  141 Ω + j120 Ω 
C)  120 Ω + j75 Ω 
D)  j75 Ω + j120 Ω 
A)  75 Ω + j120 Ω 
B)  141 Ω + j120 Ω 
C)  120 Ω + j75 Ω 
D)  j75 Ω + j120 Ω

Question 4

-Given the circuit in Figure 16-3, what is the total circuit current?

Accepted Answer

A)  7.07 mA 
B)  2.0 mA 
C)  20 mA 
D)  100 mA 
A)  7.07 mA 
B)  2.0 mA 
C)  20 mA 
D)  100 mA

Question 5

-Given the circuit in Figure 16-6, what is the impedance phase angle?

Accepted Answer

A)  87.6° 
B)  45° 
C)  23.4° 
D)  43.2° 
A)  87.6° 
B)  45° 
C)  23.4° 
D)  43.2°

Question 6

-In the circuit in Figure 16-1, increasing the frequency will cause an increase in circuit impedance.

Accepted Answer

A) True 
 B)False

Question 7

-In the circuit in Figure 16-1, The current lags the voltage.

Accepted Answer

A) True 
 B)False

Question 8

If XL = 100 ohms and R = 100 ohms in a series RL circuit, then impedance will be:

Accepted Answer

A)  200 Ω 
B)  14.14 Ω 
C)  100 Ω 
D)  141.4 Ω 
A)  200 Ω 
B)  14.14 Ω 
C)  100 Ω 
D)  141.4 Ω

Question 9

Switching power supplies:

Accepted Answer

A)  are efficient at converting ac to dc 
B)  contain pulse-width modulators 
C)  can change unregulated dc to high frequency pulses 
D)  all of the above 
A)  are efficient at converting ac to dc 
B)  contain pulse-width modulators 
C)  can change unregulated dc to high frequency pulses 
D)  all of the above

Question 10

In a series RL circuit, the resultant voltage vector represents the total applied voltage.

Accepted Answer

A) True 
 B)False

Question 11

-What is the total circuit impedance in Figure ?

Accepted Answer

A)  141.5 Ω 
B)  195 Ω 
C)  14.15 Ω 
D)  120 Ω 
A)  141.5 Ω 
B)  195 Ω 
C)  14.15 Ω 
D)  120 Ω

Question 12

The total opposition that a series or parallel RL circuit offers to current flow is called .

Accepted Answer

A)  inductive impedance 
B)  susceptance 
C)  reactance 
D)  impedance 
A)  inductive impedance 
B)  susceptance 
C)  reactance 
D)  impedance

Question 13

Figure 16-8
-The inverse of inductive reactance is:

Accepted Answer

A)  impedance 
B)  resistance 
C)  inductive susceptance 
D)  capacitive susceptance 
A)  impedance 
B)  resistance 
C)  inductive susceptance 
D)  capacitive susceptance

Question 14

-In the circuit in Figure 16-2, assume that XL = R. The phase angle is 45°.

Accepted Answer

A) True 
 B)False

Question 15

-In the circuit in Figure 16-2, increasing the frequency will cause an increase in circuit impedence.

Accepted Answer

A) True 
 B)False

Question 16

-Given the circuit in Figure 16-6, does the total current lead or lag the total voltage?

Accepted Answer

A)  The total current IT) lags the total voltage VS). 
B)  The total current IT) leads the total voltage VS). 
A)  The total current IT) lags the total voltage VS). 
B)  The total current IT) leads the total voltage VS).

Question 17

-Given the circuit in Figure , what is the total circuit impedance?

Accepted Answer

A)  44.96 Ω 
B)  449.6 Ω 
C)  222.6 Ω 
D)  268.3 Ω 
A)  44.96 Ω 
B)  449.6 Ω 
C)  222.6 Ω 
D)  268.3 Ω

Question 18

-Given the circuit in Figure 16-5, what is the current through the resistor?

Accepted Answer

A)  3.0 A 
B)  0.707 A 
C)  2.0 A 
D)  1.0 A 
A)  3.0 A 
B)  0.707 A 
C)  2.0 A 
D)  1.0 A

Question 19

For parallel ac circuits containing resistance and inductive reactance, total current can only be found using right-triangle methods.

Accepted Answer

A) True 
 B)False

Question 20

-Given the circuit in Figure 16-6, what is the current through the inductor?

Accepted Answer

A)  533.3 mA 
B)  300 mA 
C)  21.8 mA 
D)  218 mA 
A)  533.3 mA 
B)  300 mA 
C)  21.8 mA 
D)  218 mA

Exam 16: Rl Circuits

In a series resistor/inductor circuit:

In a series RL circuit, if resistance increases, impedance will:

What is the Impedance of the circuit in Figure , expressed in rectangular form?

-Given the circuit in Figure 16-3, what is the total circuit current?

-Given the circuit in Figure 16-6, what is the impedance phase angle?

-In the circuit in Figure 16-1, increasing the frequency will cause an increase in circuit impedance.

-In the circuit in Figure 16-1, The current lags the voltage.

If XL = 100 ohms and R = 100 ohms in a series RL circuit, then impedance will be:

Switching power supplies:

In a series RL circuit, the resultant voltage vector represents the total applied voltage.

-What is the total circuit impedance in Figure ?

The total opposition that a series or parallel RL circuit offers to current flow is called .

Figure 16-8 -The inverse of inductive reactance is:

-In the circuit in Figure 16-2, assume that XL = R. The phase angle is 45°.

-In the circuit in Figure 16-2, increasing the frequency will cause an increase in circuit impedence.

-Given the circuit in Figure 16-6, does the total current lead or lag the total voltage?

-Given the circuit in Figure , what is the total circuit impedance?

-Given the circuit in Figure 16-5, what is the current through the resistor?

For parallel ac circuits containing resistance and inductive reactance, total current can only be found using right-triangle methods.

-Given the circuit in Figure 16-6, what is the current through the inductor?

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

Rlc Circuits and Resonance

Passive Filters

Circuit Theorems in Ac Analysis

Time Response of Reactive Circuits

Three-Phase Systems in Power Applications

Filters