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Electrical Inductors MCQ Electrical Engineering

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About Electrical Inductors

Following are some of the multiple choice questions on the Electrical Inductors with answers that will help the students in developing their knowledge.

Electrical Inductors MCQ

1. What is the symbol for Inductance?

I
Z
XL
L

2. Lamination of transformer core is made of

Cast Iron
Silicon Steel
Aluminium
Cast Steel

3. If supply frequency of a transformer increases, the secondary output voltage of the transformer

Increase
Decrease
Remain the same
Any of the above

4. Inductor stores energy in the form of

Electric field
Electromagnetic field
Magnetic field
None of the above

5. To demonstrate static electricity, a teacher takes an inflated balloon and rubs it against his hair. The rubber balloon picks up electrons from his hair, which makes his hair have

a net negative charge
a magnetic force
a net positive charge

6. ------------------------ is created out of two metal plates and an insulating material called a dielectric.

An inductor
A capacitor
A fixed resistor
A variable resistor

7. The production of a voltage across an inductor as a result of its own expanding or contracting magnetic field is called ____.

Flux density
Self-inductance
Counter emf
Faraday's second law

8. Neutrons have a __________ charge.

Negative
Positive
Neutral

9. Why do socks stick together when they come out of the dryer?

One has a negative charge and the other has a positive charge
Both have negative charges
Both have positive charges

10. The closer the charges, the ___________ the force between them

closer
further
stronger
weaker

11. If a substance has a higher number of electrons than protons on its surface, what type of charge does it have?

A positive charge.
A negative charge.
A neutral charge
No charge at all

12. What types of charges repel?

Positive and Positive
Positive and Neutral
Negative and Neutral
Neutral and Neutral

13. The transfer of what type of atomic particle is responsible for the static charges on objects?

neutrons
protons
electrons
none of these

14. Charged objects can be attracted to:

Neutral objects
Objects with the opposite charge
Both

15. Which of the following does not change in an ordinary transformer........

.Frequency
.Voltage
.Current
Any of the above

16. Mutual inductance between two magnetically coupled coils depends on

Permeability of the core material
Number of turns of the coils
Cross sectional area of their common core
All of the above

17. If in an iron cored coil the iron core is removed so as to make the air cored coil, the inductance of the coil will be

More
Less
The same
None of these

18. The center of an inductor, which is either made from insulating or conducting material is called the ____.

henry
dielectric
core
center

19. Inductance value is also affected by permeability, , cross sectional area and____________.

impedance
the alternating current
the number of turns
impedance

20. Capacitors are identified by which two values?

Farads and watts
Maxwells and current
Farads and voltage
Watts and henries

21. What is the unit of measurement for capacitance?

Maxwells
Farads
Henries
Watts

22. The ability of a capacitor to store a charge is called __________.

Resistance
Capacitance
Inductance
Dielectric constant

23. Two common inductor cores are ___________.

air and iron
carbon and copper
plastic and Teflon
desiccant and lead

24. Which of the following is NOT a dielectric material ?

air
ceramic
glass
copper

25. If the capacitance of a capacitor is 47μF, and the voltage difference across the capacitor terminals is 6V, then the energy stored in that capacitor is:

846×10-6Joule
7.23×10-3 Joule
6.76×10-5Joule
5.94×10-2Joule

26. How much energy is stored when 50 A flowsthrough a 20 H inductor?

500 J
10000 J
12500 J
25000 J
50000 J

27. An inductor with an inductance of 5mH is connected in series with a 20 ohm resistor.What is the time constant of the inductor?

2.5 x 10^-4 s
4 x 10^4 s
0.1s
100s

28. With respect to the capacitor, which relationship is true?

C = Q/V
V = C×Q
Q = C/V
Q = V/C

29. What is the voltage across the plates of the capacitor if the capacitance is 10 micro Farads and the Charge stored is 30 micro Coulombs?

0.333 V
3 V
300 V
0.3 V

30. Which of the following is the unit of inductance?

Ohm
Henry
Ampere turns
Webers/meter

31. The electrical energy consumed by a coil is stored in the form of:

an electrical field
a force field
an electrostatic field
a magnetic field

32. The voltage induced across an inductor as its magnetic field collapses is called ____.

Counter emf
Transition voltage
Reverse voltage
Counter voltage

33. Transformer core are laminated in order to

reduce hysteresis loss
reduce hysteresis & eddy current loss
minimize eddy current loss
Copper loss

34. An Inductor works as a ___________ circuit for DC supply.

Open
Short
Polar
Non-polar

35. Inductor cores can be made of

air
iron
magnetic materials
all of these

36. Inductive reactance is expressed as

1/2πfL
2πfL
f/2πL
X

37. Inductors connected in series will

be the reciprocal of the sum total of inductors for final value of Henrys
be the sum total of inductors for final value of Henrys
be the reciprocal of the sum of reciprocals of each inductor
act as a voltage divider network

38. The rate of change of ? determines the generated EMF in an inductor

voltage and current
current and time
voltage and time
back EMF and current

39. An inductor stores energy

in the skin of the conductor
in the magnetospheric region of the electrons
in the dielectric material
in a magnetic field

40. Your grade for inductors will depend highly on

how much I like you
how much you study
how lucky you are
luck of the draw

41. ELI went to visit ICE and the two really resonated together! As a result, a ???? circuit was born.

Cole-Porter phase invertor
rejector
tank
Dailey-Vincent oscillator

42. Skin effect is a concern

at lower frequencies
cable is exposed to UV rays
at higher frequencies
there are many eddy currents present

43. Skin effects tends to

heat the conductor
cause a huge loss of efficiency
concentrate electrons on the outer edge (skin) of the conductor
cause signal distortion

44. The "Q" of an inductor is expressed in units of

Henries
Faroids
Reluctance
Q has no units

45. An inductor tends to

reject low frequencies
reject high frequencies
pass a band of frequencies
reject a band of frequencies

46. Magnetic coupling is when

magnetic lines link
two magnets get married
two magnets are placed end-to-end
magnets line-up and repel each other

47. The transient response of an inductor is expressed as

T = 1/RL
T = RL
t = R/L
t = L/R

48. The magnetic field can be increased by adding

removing the core
adding a core
decreasing the number of windings
changing the diameter of the wire insulation

49. The unit of measurement for the inductor is

Farad
Henry
George
Jones

50. The force that opposes a rise in current is the

BEMF
EMF
MFF
BPM

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