Inductance: Definition, Types, and Applications in Electrical Engineering

Question 1

Which factor does NOT affect the inductance of an inductor?

Accepted Answer

Frequency of the AC current flowing through the inductor

Answer

Length of the coil

Answer

Cross-sectional area of the coil

Answer

Permeability of the core material

Question 2

What is the SI unit of inductance?

Accepted Answer

Henry (H)

Answer

Farad (F)

Answer

Ohm (Ω)

Answer

Tesla (T)

Question 3

The inductance of a solenoid with N turns, length L, and cross-sectional area A is given by:

Accepted Answer

μ₀N²L/A

Answer

μ₀NAL/L

Answer

μ₀N²A/L

Answer

μ₀NAL

Question 4

The energy stored in an inductor with inductance L and current I is given by:

Accepted Answer

LI²/2

Answer

IL/2

Answer

L²I/2

Answer

I²/2L

Question 5

A coil has an inductance of 2 H. If the current through the coil changes from 1 A to 3 A in 0.1 s, what is the induced emf?

Accepted Answer

40 V

Answer

20 V

Answer

10 V

Answer

5 V

Question 6

Which material is NOT commonly used as a core for an inductor?

Accepted Answer

Copper

Answer

Iron

Answer

Nickel

Answer

Air

Question 7

Identify the property that is NOT characteristic of an inductor.

Accepted Answer

Behaves as a resistor at high frequencies

Answer

Stores energy in its magnetic field

Answer

Opposes changes in current flow

Answer

Can be used to filter AC signals

Question 8

What is the unit of inductance in the International System of Units (SI)?

Accepted Answer

Henry

Answer

Farad

Answer

Tesla

Answer

Weber

Question 9

Calculate the inductance of a toroid with N turns, radius r, and cross-sectional area A.

Accepted Answer

(μ₀N²A) / (2πr)

Answer

(μ₀N²) / (4πr)

Answer

(μN) / (2πr²)

Answer

(μN²) / (8πr)

Question 10

In an L-R circuit, how does the current through the inductor behave over time?

Accepted Answer

Decreases exponentially with time

Answer

Increases linearly with time

Answer

Remains constant

Answer

Oscillates sinusoidally

Question 11

Determine the energy stored in an inductor.

Accepted Answer

(1 / 2)LI²

Answer

(1 / 4)LI²

Answer

LI

Answer

2LI²

Question 12

Which of the following factors does NOT affect the inductance of a coil?

Accepted Answer

Current flowing through the coil

Answer

Number of turns

Answer

Material of the core

Answer

Physical dimensions

Question 13

Which of the following is NOT a common application of inductors in electrical engineering?

Accepted Answer

Voltage regulation

Answer

Power factor correction

Answer

Signal filtering

Answer

Energy storage

Question 14

In an AC circuit containing an inductor, how does inductive reactance vary with frequency?

Accepted Answer

Increases with frequency

Answer

Decreases with frequency

Answer

Remains constant

Question 15

The inductance of a solenoid is directly proportional to its:

Accepted Answer

Number of turns squared

Answer

Length

Answer

Cross-sectional area

Answer

Material of the core

Question 16

The energy stored in an inductor is given by:

Accepted Answer

1/2 LI^2

Answer

LI

Answer

1/4 LI^2

Answer

2LI

Question 17

The inductance per unit length of a toroid with a certain number of turns and a constant radius is:

Accepted Answer

Proportional to the number of turns

Answer

Inversely proportional to the number of turns

Answer

Independent of the number of turns

Answer

Proportional to the square of the number of turns

Question 18

The mutual inductance between two coils is:

Accepted Answer

The ratio of the flux linkage to the current in both coils

Answer

The ratio of the induced voltage to the current in one coil

Answer

The ratio of the induced voltage to the current in both coils

Answer

The ratio of the flux linkage to the current in one coil

Question 19

What is the SI unit of electrical inductance?

Accepted Answer

Henry

Answer

Farad

Answer

Weber

Answer

Ampere

Question 20

The energy stored in an inductor is given by the formula:

Accepted Answer

1/2LI^2

Answer

LI^2

Answer

1/2CV^2

Answer

CV^2

Question 21

According to Lenz's law, the current in an inductor cannot change instantaneously.

Accepted Answer

True

Answer

False

Question 22

The time constant of an inductor with inductance L and resistance R connected in series is:

Accepted Answer

L/R

Answer

R/L

Answer

LR

Answer

1/LR

Question 23

The SI unit of inductance is?

Accepted Answer

Henry

Answer

Weber

Answer

Farad

Answer

Tesla

Question 24

Which of the following materials is commonly used as the core of an inductor?

Accepted Answer

Iron

Answer

Copper

Answer

Rubber

Answer

Plastic

Question 25

The energy stored in an inductor with inductance L and current I is:

Accepted Answer

½LI²

Answer

LI

Answer

½LI

Answer

LI²

Question 26

The relationship between inductance and number of turns in a coil is:

Accepted Answer

Directly proportional

Answer

Inversely proportional

Answer

No relationship

Answer

Logarithmically proportional

Question 27

The effect of an iron core on the inductance of a coil is to:

Accepted Answer

Increase inductance

Answer

Decrease inductance

Answer

No effect

Answer

Reverse inductance

Question 28

The formula for the inductance of a toroid with N turns, mean radius R, and cross-sectional area A is:

Accepted Answer

μ₀N²(2πR)

Answer

μ₀N²/(2πR)

Answer

(2πR)/μ₀N²

Answer

μ₀(2πR)²/N²

Question 29

Identify the factors that influence the inductance of an inductor.

Accepted Answer

Number of coils

Accepted Answer

Length of the inductor

Accepted Answer

Material of the inductor's core

Question 30

What is the SI unit of inductance?

Accepted Answer

Henry (H)

Answer

Weber (Wb)

Answer

Farad (F)

Answer

Ampere (A)

Question 31

Where is energy stored in an inductor?

Accepted Answer

Magnetic field

Answer

Electric field

Answer

Mechanical motion

Question 32

Which device utilizes the inductive property of a coil to transfer electrical energy?

Accepted Answer

Transformer

Answer

Resistor

Answer

Diode

Answer

Capacitor

Question 33

The inductance of a solenoid with length L, cross-sectional area A, and N turns is given by:

Accepted Answer

(µ₀N²A) / L

Answer

N / (µ₀LA)

Answer

L / (µ₀N²A)

Answer

(µ₀L) / (N²A)

Question 34

Inductors primarily oppose changes in:

Accepted Answer

Current

Answer

Charge

Answer

Resistance

Answer

Voltage

Question 35

The energy stored in an inductor with inductance L and current I is:

Accepted Answer

(1/2)LI²

Answer

LI

Answer

(1/4)LI²

Question 36

Which material, when used as a core for inductors, increases their inductance?

Accepted Answer

Ferromagnetic

Answer

Paramagnetic

Answer

Diamagnetic

Question 37

When inductors are connected in series, their total inductance is:

Accepted Answer

The sum of individual inductances

Answer

The product of individual inductances

Answer

The average of individual inductances

Answer

The difference of individual inductances

Question 38

Which material below exhibits the highest magnetic permeability?

Accepted Answer

Iron

Answer

Copper

Answer

Plastic

Answer

Aluminum

Question 39

A solenoid with 1000 turns and a length of 0.5 m carries a current of 2 A. Calculate the solenoid's inductance.

Accepted Answer

0.01 H

Answer

0.001 H

Answer

0.1 H

Answer

1 H

Question 40

Which of the following is NOT an application of inductors?

Accepted Answer

Energy storage in batteries

Answer

Inductors in filters

Answer

Chokes

Answer

Transformers

Question 41

The unit of inductance measurement is:

Accepted Answer

Henry

Answer

Ohm

Answer

Farad

Answer

Tesla

Question 42

According to Lenz's law, the direction of the induced current:

Accepted Answer

Opposes the change in magnetic flux

Answer

Is proportional to the rate of change of magnetic flux

Answer

Is always clockwise

Question 43

When a DC voltage is applied to an inductor, the inductor will initially:

Accepted Answer

Oppose the flow of current

Answer

Cause the circuit to oscillate

Answer

Enhance the flow of current

Answer

Have no effect on the flow of current

Question 44

Which of the following components is fundamentally different from an inductor?

Accepted Answer

Resistor

Answer

Air-core coil

Answer

Solenoid

Answer

Toroid

Question 45

The inductance of a solenoid is directly proportional to the square of which of the following factors?

Accepted Answer

Number of turns

Answer

Diameter of the solenoid

Answer

Current flowing through the solenoid

Answer

Length of the solenoid

Question 46

Where is energy primarily stored in an inductor?

Accepted Answer

Magnetic field created by the inductor

Answer

Conductor of the inductor

Answer

Electric field created by the inductor

Answer

Heat generated by the inductor

Question 47

Inductors are commonly used in which of the following applications, where energy storage is NOT the primary function?

Accepted Answer

Signal filtering

Answer

Switching power supplies

Answer

Energy storing devices in circuits

Answer

Electric motors

Question 48

What is the SI unit of inductance?

Accepted Answer

Henry

Answer

Tesla

Answer

Farad

Answer

Weber

Question 49

Which material, when used as the core of an inductor, significantly increases its inductance?

Accepted Answer

Ferromagnetic material like iron

Answer

Copper

Answer

Aluminum

Answer

Plastic

Question 50

The back electromotive force (EMF) induced in an inductor acts to oppose any:

Accepted Answer

Change in current flowing through it

Answer

Change in the inductor's inductance

Answer

Change in the magnetic field around the inductor

Answer

Change in the voltage applied to the inductor

Question 51

Which of the following factors affects the inductance of a coil?

Accepted Answer

All of the above

Answer

Number of turns

Answer

Material of the core

Answer

Length of the coil

Question 52

An inductor with a larger inductance, compared to one with smaller inductance, will generally have:

Accepted Answer

A higher energy storage capacity for a given current

Answer

A lower current carrying capacity for a given wire gauge

Answer

A lower resistance for a given wire material and length

Answer

A smaller physical size for a given core material