Question 1

Power in an RL circuit can be measured as:

Accepted Answer

A)  apparent power  (Pa) . 
B)  true power (Ptrue). 
C)  reactive power  (Pr) . 
D)  all of these. 
A)  apparent power  (Pa) . 
B)  true power (Ptrue). 
C)  reactive power  (Pr) . 
D)  all of these.

Question 2

\[\text { Figure } 12 L and IR in Figure 12-2?

Accepted Answer

A)  They are  180°  out of phase. 
B)  IL lags IR. 
C)  They are in phase. 
D)  IL leads IR. 
A)  They are  180°  out of phase. 
B)  IL lags IR. 
C)  They are in phase. 
D)  IL leads IR.

Question 3

When an ac voltage is supplied to an RL circuit, the acʹs current and amplitude Will be:

Accepted Answer

A) similar in Wave form. 
B) varying in the same manner. 
C) lagging the Voltage. 
D) all of these. 
A) similar in Wave form. 
B) varying in the same manner. 
C) lagging the Voltage. 
D) all of these.

Question 4

The voltage measured across the inductor in a series RL has dropped significantly from normal. What could possibly be the problem?

Accepted Answer

A)  The resistor has gone up in value. 
B)  partial shorting of the windings of the inductor 
C)  The resistor has gone down in value. 
D)  either A or B 
A)  The resistor has gone up in value. 
B)  partial shorting of the windings of the inductor 
C)  The resistor has gone down in value. 
D)  either A or B

Question 5

If the resistive current is 2 A and the inductive current is 2 A in a parallel RL circuit, total current is ________.

Accepted Answer

A) 5.66 A 
B) 2.83 A 
C) 4 A 
D) 2 A 
A) 5.66 A 
B) 2.83 A 
C) 4 A 
D) 2 A

Question 6

$$\text { Figure } 12 < 3$$
-What is VOUT at the cutoff frequency in Figure 12-3?

Accepted Answer

A) 14.4V 
B) 12.9V 
C) 15.6V 
D) 15.1V 
A) 14.4V 
B) 12.9V 
C) 15.6V 
D) 15.1V

Question 7

The impedance of an RL series circuit varies inversely With the frequency.

Accepted Answer

A) True 
 B)False

Question 8

After having troubleshot a series RL circuit, you check the resistance of the inductor and it is around 40 ohms.W hat conclusion does this bring you to?

Accepted Answer

A) Since the inductorʹsVoltage Was nearly zero, you are sure the Windings have shorted. 
B) Since the inductorʹsVoltage Was nearly zero, the inductor is probably okay so the resistor must be shorted. 
C) Since the inductorʹsVoltage Was nearly zero, the inductor is probably okay, so the resistor must be open. 
D) not enough information 
A) Since the inductorʹsVoltage Was nearly zero, you are sure the Windings have shorted. 
B) Since the inductorʹsVoltage Was nearly zero, the inductor is probably okay so the resistor must be shorted. 
C) Since the inductorʹsVoltage Was nearly zero, the inductor is probably okay, so the resistor must be open. 
D) not enough information

Question 9

$$\text { Figure } 12 < 1$$
-If the frequency is 60 Hz in Figure 12-1,What is the inductance?

Accepted Answer

A) 26.5 mH 
B) 265 mH 
C) 3.77 mH 
D) 3.77 H 
A) 26.5 mH 
B) 265 mH 
C) 3.77 mH 
D) 3.77 H

Question 10

$$\text { Figure } 12 < 3$$
-What is the cutoff frequency in Figure 12-3?

Accepted Answer

A) 7.96 kHz 
B) 796 Hz 
C) 637 kHz 
D) 637 Hz 
A) 7.96 kHz 
B) 796 Hz 
C) 637 kHz 
D) 637 Hz

Question 11

A low-pass filter passes high frequencies and blocks other frequencies.

Accepted Answer

A) True 
 B)False

Question 12

$$\text { Figure } 12 < 1$$
-If the source voltage changes to 100 V in Figure 12-1, the true power is ________.

Accepted Answer

A) 16W 
B) 40 mW 
C) 4W 
D) 40W 
A) 16W 
B) 40 mW 
C) 4W 
D) 40W

Question 13

$$\text { Figure } 12 < 1$$
-If the frequency increases in Figure 12-1, the current ________.

Accepted Answer

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

Question 14

It is suspected that a high pass filterʹs cutoff frequency has changed.W hat pieces of test equipment could be used to check it out?

Accepted Answer

A) an oscilloscope and a square Wave generator 
B) voltmeter and a sine Wave generator 
C) either A or B 
D) none of the above 
A) an oscilloscope and a square Wave generator 
B) voltmeter and a sine Wave generator 
C) either A or B 
D) none of the above

Question 15

$$\text { Figure } 12 < 1$$
-Calculate the true power in Figure 12-1.

Accepted Answer

A) 1W 
B) 10W 
C) 400 mW 
D) 4W 
A) 1W 
B) 10W 
C) 400 mW 
D) 4W

Question 16

Which of the following is typically most important of the three types of power in terms of Work being done?

Accepted Answer

A) reactive 
B) inductive 
C) apparent 
D) true 
A) reactive 
B) inductive 
C) apparent 
D) true

Question 17

If the inductance increases in an RL filter circuit, the cutoff frequency increases.

Accepted Answer

A) True 
 B)False

Question 18

$$\text { Figure } 12 < 2$$
-What change Would decrease the power factor in Figure 12-2?

Accepted Answer

A)  Increase the source voltage. 
B)  Decrease the value of the resistor. 
C)  Decrease the source voltage. 
D)  Increase the value of the resistor 
A)  Increase the source voltage. 
B)  Decrease the value of the resistor. 
C)  Decrease the source voltage. 
D)  Increase the value of the resistor

Question 19

$$\text { Figure } 12 < 1$$
-If the frequency decreases in Figure 12-1, the phase angle ________ and the current ________.

Accepted Answer

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

Question 20

$$\text { Figure } 12 < 1$$
-If the frequency increases in Figure 12-1, the phase angle ________ and the current ________.

Accepted Answer

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

Power in an RL circuit can be measured as:

$\text { Figure } 12 < 2 -Which statement describes the relationship of I<sub>L</sub> and I<sub>R</sub> in Figure 12-2?$ $\text { Figure } 12 < 2$ -Which statement describes the relationship of I_L and I_R in Figure 12-2?

When an ac voltage is supplied to an RL circuit, the acʹs current and amplitude Will be:

The voltage measured across the inductor in a series RL has dropped significantly from normal. What could possibly be the problem?

If the resistive current is 2 A and the inductive current is 2 A in a parallel RL circuit, total current is ________.

$\text { Figure } 12 < 3 -What is VOUT at the cutoff frequency in Figure 12-3?$ $\text { Figure } 12 < 3$ -What is VOUT at the cutoff frequency in Figure 12-3?

The impedance of an RL series circuit varies inversely With the frequency.

After having troubleshot a series RL circuit, you check the resistance of the inductor and it is around 40 ohms.W hat conclusion does this bring you to?

$\text { Figure } 12 < 1 -If the frequency is 60 Hz in Figure 12-1,What is the inductance?$ $\text { Figure } 12 < 1$ -If the frequency is 60 Hz in Figure 12-1,What is the inductance?

$\text { Figure } 12 < 3 -What is the cutoff frequency in Figure 12-3?$ $\text { Figure } 12 < 3$ -What is the cutoff frequency in Figure 12-3?

A low-pass filter passes high frequencies and blocks other frequencies.

$\text { Figure } 12 < 1 -If the source voltage changes to 100 V in Figure 12-1, the true power is .$ $\text { Figure } 12 < 1$ -If the source voltage changes to 100 V in Figure 12-1, the true power is .

$\text { Figure } 12 < 1 -If the frequency increases in Figure 12-1, the current .$ $\text { Figure } 12 < 1$ -If the frequency increases in Figure 12-1, the current .

It is suspected that a high pass filterʹs cutoff frequency has changed.W hat pieces of test equipment could be used to check it out?

$\text { Figure } 12 < 1 -Calculate the true power in Figure 12-1.$ $\text { Figure } 12 < 1$ -Calculate the true power in Figure 12-1.

Which of the following is typically most important of the three types of power in terms of Work being done?

If the inductance increases in an RL filter circuit, the cutoff frequency increases.

$\text { Figure } 12 < 2 -What change Would decrease the power factor in Figure 12-2?$ $\text { Figure } 12 < 2$ -What change Would decrease the power factor in Figure 12-2?

$\text { Figure } 12 < 1 -If the frequency decreases in Figure 12-1, the phase angle and the current .$ $\text { Figure } 12 < 1$ -If the frequency decreases in Figure 12-1, the phase angle and the current .

$\text { Figure } 12 < 1 -If the frequency increases in Figure 12-1, the phase angle and the current .$ $\text { Figure } 12 < 1$ -If the frequency increases in Figure 12-1, the phase angle and the current .

Quantities and Units

Voltage, Current, and Resistance

Ohms Law, Energy, and Power

Series Circuits

Parallel Circuits

Series-Parallel Circuits

Magnetism and Electromagnetism

Introduction to Alternating Current and Voltage

Capacitors

Rc Circuits

Inductors

Rlc Circuits and Resonance

Time Response of Reactive Circuits

Transformers

Regulators, Filters, and Op-Amps

Understanding Transducers, Sensors, and Conversion in Industrial Processes

Filters

Exam 12: Rl Circuits

Power in an RL circuit can be measured as:

Figure 12<2\text { Figure } 12 < 2 Figure 12<2 -Which statement describes the relationship of IL and IR in Figure 12-2?

When an ac voltage is supplied to an RL circuit, the acʹs current and amplitude Will be:

The voltage measured across the inductor in a series RL has dropped significantly from normal. What could possibly be the problem?

If the resistive current is 2 A and the inductive current is 2 A in a parallel RL circuit, total current is ________.

Figure 12<3\text { Figure } 12 < 3 Figure 12<3 -What is VOUT at the cutoff frequency in Figure 12-3?

The impedance of an RL series circuit varies inversely With the frequency.

After having troubleshot a series RL circuit, you check the resistance of the inductor and it is around 40 ohms.W hat conclusion does this bring you to?

Figure 12<1\text { Figure } 12 < 1 Figure 12<1 -If the frequency is 60 Hz in Figure 12-1,What is the inductance?

Figure 12<3\text { Figure } 12 < 3 Figure 12<3 -What is the cutoff frequency in Figure 12-3?

A low-pass filter passes high frequencies and blocks other frequencies.

Figure 12<1\text { Figure } 12 < 1 Figure 12<1 -If the source voltage changes to 100 V in Figure 12-1, the true power is ________.

Figure 12<1\text { Figure } 12 < 1 Figure 12<1 -If the frequency increases in Figure 12-1, the current ________.

It is suspected that a high pass filterʹs cutoff frequency has changed.W hat pieces of test equipment could be used to check it out?

Figure 12<1\text { Figure } 12 < 1 Figure 12<1 -Calculate the true power in Figure 12-1.

Which of the following is typically most important of the three types of power in terms of Work being done?

If the inductance increases in an RL filter circuit, the cutoff frequency increases.

Figure 12<2\text { Figure } 12 < 2 Figure 12<2 -What change Would decrease the power factor in Figure 12-2?

Figure 12<1\text { Figure } 12 < 1 Figure 12<1 -If the frequency decreases in Figure 12-1, the phase angle ________ and the current ________.

Figure 12<1\text { Figure } 12 < 1 Figure 12<1 -If the frequency increases in Figure 12-1, the phase angle ________ and the current ________.

Quantities and Units

Voltage, Current, and Resistance

Ohms Law, Energy, and Power

Series Circuits

Parallel Circuits

Series-Parallel Circuits

Magnetism and Electromagnetism

Introduction to Alternating Current and Voltage

Capacitors

Rc Circuits

Inductors

Rlc Circuits and Resonance

Time Response of Reactive Circuits

Transformers

Regulators, Filters, and Op-Amps

Understanding Transducers, Sensors, and Conversion in Industrial Processes

Filters

$\text { Figure } 12 < 2 -Which statement describes the relationship of I<sub>L</sub> and I<sub>R</sub> in Figure 12-2?$ $\text { Figure } 12 < 2$ -Which statement describes the relationship of I_L and I_R in Figure 12-2?

$\text { Figure } 12 < 3 -What is VOUT at the cutoff frequency in Figure 12-3?$ $\text { Figure } 12 < 3$ -What is VOUT at the cutoff frequency in Figure 12-3?

$\text { Figure } 12 < 1 -If the frequency is 60 Hz in Figure 12-1,What is the inductance?$ $\text { Figure } 12 < 1$ -If the frequency is 60 Hz in Figure 12-1,What is the inductance?

$\text { Figure } 12 < 3 -What is the cutoff frequency in Figure 12-3?$ $\text { Figure } 12 < 3$ -What is the cutoff frequency in Figure 12-3?

$\text { Figure } 12 < 1 -If the source voltage changes to 100 V in Figure 12-1, the true power is .$ $\text { Figure } 12 < 1$ -If the source voltage changes to 100 V in Figure 12-1, the true power is .

$\text { Figure } 12 < 1 -If the frequency increases in Figure 12-1, the current .$ $\text { Figure } 12 < 1$ -If the frequency increases in Figure 12-1, the current .

$\text { Figure } 12 < 1 -Calculate the true power in Figure 12-1.$ $\text { Figure } 12 < 1$ -Calculate the true power in Figure 12-1.

$\text { Figure } 12 < 2 -What change Would decrease the power factor in Figure 12-2?$ $\text { Figure } 12 < 2$ -What change Would decrease the power factor in Figure 12-2?

$\text { Figure } 12 < 1 -If the frequency decreases in Figure 12-1, the phase angle and the current .$ $\text { Figure } 12 < 1$ -If the frequency decreases in Figure 12-1, the phase angle and the current .

$\text { Figure } 12 < 1 -If the frequency increases in Figure 12-1, the phase angle and the current .$ $\text { Figure } 12 < 1$ -If the frequency increases in Figure 12-1, the phase angle and the current .