Question 1

If an inductor carries  100 mADC of current when connected across a  30 VDC source, then what is its resistance?

Accepted Answer

A)   60$\Omega$ 
B)   0$\Omega$ 
C)   300$\Omega$ 
D)   30$\Omega$ 
A)   60$\Omega$ 
B)   0$\Omega$ 
C)   300$\Omega$ 
D)   30$\Omega$

Question 2

What is the inductive reactance of an inductor that drops  12 VRMS  and carries  50 mARMS  ?

Accepted Answer

A)     
B)   600$\Omega$ 
C)   6$\Omega$ 
D)   60$\Omega$ 
A)     
B)   600$\Omega$ 
C)   6$\Omega$ 
D)   60$\Omega$

Question 3

Do iron-core inductors or air-core inductors generally have the larger inductance?

Accepted Answer

A)  neither; iron-core inductors and air-core inductors have the same inductance 
B)  iron core 
C)  air core 
D)  There is no way to tell. 
A)  neither; iron-core inductors and air-core inductors have the same inductance 
B)  iron core 
C)  air core 
D)  There is no way to tell.

Question 4

If an inductor is placed in an ac circuit, the ac voltage across the inductor leads the ac current through it.

Accepted Answer

A) True 
 B)False

Question 5

If an inductor has an ac current flowing through it, the magnetic field is ________.

Accepted Answer

A) collapsed 
B) steady 
C) constantly changing 
D) moving from south to north 
A) collapsed 
B) steady 
C) constantly changing 
D) moving from south to north

Question 6

If a  50 mH  inductor operates at  22kHz,XL  equals_______

Accepted Answer

A)   113$\Omega$ 
B)   1100$\Omega$ 
C)  6912 $\Omega$ 
D)   500$\Omega$ 
A)   113$\Omega$ 
B)   1100$\Omega$ 
C)  6912 $\Omega$ 
D)   500$\Omega$

Question 7

Which type of inductor core material is likely to produce the least inductance?

Accepted Answer

A) ferrite 
B) iron 
C) air 
A) ferrite 
B) iron 
C) air

Question 8

What is the inductive reactance of a  0.2 mH  inductor operating at  1kHz  ?

Accepted Answer

A)  126 $\mathrm { k } \Omega$ 
B)   1.26  $\mathrm { k } \Omega$ 
C)   1.26$\Omega$ 
D)   126$\Omega$ 
A)  126 $\mathrm { k } \Omega$ 
B)   1.26  $\mathrm { k } \Omega$ 
C)   1.26$\Omega$ 
D)   126$\Omega$

Question 9

If a  50 mH  inductor is in series with a 50 $\mathrm { k } \Omega$ resistor across a  50 VDC  source, what is the maximum current that will flow in the circuit?

Accepted Answer

A)   1 $\mu \mathrm { A }$ 
B)   10 mA 
C)   100 $\mu \mathrm { A }$ 
D)   1 mA 
A)   1 $\mu \mathrm { A }$ 
B)   10 mA 
C)   100 $\mu \mathrm { A }$ 
D)   1 mA

Question 10

If two inductors are connected in a series AC circuit,Which inductor drops more voltage?

Accepted Answer

A) It depends upon the frequency. 
B) the smaller inductance 
C) the larger inductance 
D) It depends upon the source Voltage. 
A) It depends upon the frequency. 
B) the smaller inductance 
C) the larger inductance 
D) It depends upon the source Voltage.

Question 11

Inductors ________.

Accepted Answer

A) have a high resistance to direct current 
B) pass direct current 
C) block direct current 
D) have high reactance to direct current 
A) have a high resistance to direct current 
B) pass direct current 
C) block direct current 
D) have high reactance to direct current

Question 12

What is the total inductance if a 50 mH inductor is connected in seriesW ith a 15 mH inductor?

Accepted Answer

A) 65 mH 
B) 50 mH 
C) 15 mH 
D) 11.5 mH 
A) 65 mH 
B) 50 mH 
C) 15 mH 
D) 11.5 mH

Question 13

When a DC voltage is first applied to an inductor, the initial circuit current is zero.

Accepted Answer

A) True 
 B)False

Question 14

If a  25 mH  inductor drops  50 V while operating at  400 Hz, what is XL ?

Accepted Answer

A)   628 $\Omega$ 
B)   62.8  $k \Omega$ 
C)   6.28  $\mathrm { k } \Omega$ 
D)   62.8 $\Omega$ 
A)   628 $\Omega$ 
B)   62.8  $k \Omega$ 
C)   6.28  $\mathrm { k } \Omega$ 
D)   62.8 $\Omega$

Question 15

$$\text { Figure } \mathbf { 1 1 } \triangleleft \mathbf { 1 }$$
-What is the total inductance in Figure 11-1?

Accepted Answer

A) 95 mH 
B) 225 mH 
C) 12.7 mH 
D) 15.8 mH 
A) 95 mH 
B) 225 mH 
C) 12.7 mH 
D) 15.8 mH

Question 16

When inductors are connected in series, their total inductance acts like:

Accepted Answer

A) resistance connected in series. 
B) resistance connected in series-parallel. 
C) resistance connected in parallel. 
D) all of these. 
A) resistance connected in series. 
B) resistance connected in series-parallel. 
C) resistance connected in parallel. 
D) all of these.

Question 17

What is the total inductance of a 40 mH inductor and a 24 mH inductor connected in parallel?

Accepted Answer

A) 15 mH 
B) 64 mH 
C) 150 mH 
D) 32 mH 
A) 15 mH 
B) 64 mH 
C) 150 mH 
D) 32 mH

Question 18

What is the inductive reactance of a  150 mH inductor operating at  10 kHz  ?

Accepted Answer

A)   6280$\Omega$ 
B)   9420$\Omega$ 
C)   8450$\Omega$ 
D)   1500$\Omega$ 
A)   6280$\Omega$ 
B)   9420$\Omega$ 
C)   8450$\Omega$ 
D)   1500$\Omega$

Question 19

What is the time constant for a  50 mH inductor and 5 $\mathrm { kO }$ resistor connected in series?

Accepted Answer

A)   10 ms 
B)   100 s 
C)   250 s 
D)  10 $\mu S$ 
A)   10 ms 
B)   100 s 
C)   250 s 
D)  10 $\mu S$

Question 20

An iron-core inductor is used in low frequency applications.

Accepted Answer

A) True 
 B)False

If an inductor carries 100 mADC of current when connected across a 30 VDC source, then what is its resistance?

What is the inductive reactance of an inductor that drops 12 V_RMS and carries 50 mA_RMS ?

Do iron-core inductors or air-core inductors generally have the larger inductance?

If an inductor is placed in an ac circuit, the ac voltage across the inductor leads the ac current through it.

If an inductor has an ac current flowing through it, the magnetic field is ________.

If a 50 mH inductor operates at 22kHz,XL equals_______

Which type of inductor core material is likely to produce the least inductance?

What is the inductive reactance of a 0.2 mH inductor operating at 1kHz ?

If a 50 mH inductor is in series with a 50 $\mathrm { k } \Omega$ resistor across a 50 V_DC source, what is the maximum current that will flow in the circuit?

If two inductors are connected in a series AC circuit,Which inductor drops more voltage?

Inductors ________.

What is the total inductance if a 50 mH inductor is connected in seriesW ith a 15 mH inductor?

When a DC voltage is first applied to an inductor, the initial circuit current is zero.

If a 25 mH inductor drops 50 V while operating at 400 Hz, what is X_L ?

$\text { Figure } \mathbf { 1 1 } \triangleleft \mathbf { 1 } -What is the total inductance in Figure 11-1?$ $\text { Figure } \mathbf { 1 1 } \triangleleft \mathbf { 1 }$ -What is the total inductance in Figure 11-1?

When inductors are connected in series, their total inductance acts like:

What is the total inductance of a 40 mH inductor and a 24 mH inductor connected in parallel?

What is the inductive reactance of a 150 mH inductor operating at 10 kHz ?

What is the time constant for a 50 mH inductor and 5 $\mathrm { kO }$ resistor connected in series?

An iron-core inductor is used in low frequency applications.

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

Rl Circuits

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 11: Inductors

If an inductor carries 100 mADC of current when connected across a 30 VDC source, then what is its resistance?

What is the inductive reactance of an inductor that drops 12 VRMS and carries 50 mARMS ?

Do iron-core inductors or air-core inductors generally have the larger inductance?

If an inductor is placed in an ac circuit, the ac voltage across the inductor leads the ac current through it.

If an inductor has an ac current flowing through it, the magnetic field is ________.

If a 50 mH inductor operates at 22kHz,XL equals_______

Which type of inductor core material is likely to produce the least inductance?

What is the inductive reactance of a 0.2 mH inductor operating at 1kHz ?

If a 50 mH inductor is in series with a 50 kΩ\mathrm { k } \OmegakΩ resistor across a 50 VDC source, what is the maximum current that will flow in the circuit?

If two inductors are connected in a series AC circuit,Which inductor drops more voltage?

Inductors ________.

What is the total inductance if a 50 mH inductor is connected in seriesW ith a 15 mH inductor?

When a DC voltage is first applied to an inductor, the initial circuit current is zero.

If a 25 mH inductor drops 50 V while operating at 400 Hz, what is XL ?

Figure 11◃1\text { Figure } \mathbf { 1 1 } \triangleleft \mathbf { 1 } Figure 11◃1 -What is the total inductance in Figure 11-1?

When inductors are connected in series, their total inductance acts like:

What is the total inductance of a 40 mH inductor and a 24 mH inductor connected in parallel?

What is the inductive reactance of a 150 mH inductor operating at 10 kHz ?

What is the time constant for a 50 mH inductor and 5 kO\mathrm { kO }kO resistor connected in series?

An iron-core inductor is used in low frequency applications.

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

Rl Circuits

Rlc Circuits and Resonance

Time Response of Reactive Circuits

Transformers

Regulators, Filters, and Op-Amps

Understanding Transducers, Sensors, and Conversion in Industrial Processes

Filters

What is the inductive reactance of an inductor that drops 12 V_RMS and carries 50 mA_RMS ?

If a 50 mH inductor is in series with a 50 $\mathrm { k } \Omega$ resistor across a 50 V_DC source, what is the maximum current that will flow in the circuit?

If a 25 mH inductor drops 50 V while operating at 400 Hz, what is X_L ?

$\text { Figure } \mathbf { 1 1 } \triangleleft \mathbf { 1 } -What is the total inductance in Figure 11-1?$ $\text { Figure } \mathbf { 1 1 } \triangleleft \mathbf { 1 }$ -What is the total inductance in Figure 11-1?

What is the time constant for a 50 mH inductor and 5 $\mathrm { kO }$ resistor connected in series?