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 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

2. During charging a capacitor variation of potential V of the capacitor with time t is shown as

3. 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

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

  • An inductor
  • A capacitor
  • A fixed resistor
  • A variable resistor

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

  • 500 J
  • 10000 J
  • 12500 J
  • 25000 J
  • 50000 J

6. 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

7. 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

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

  • Counter emf
  • Transition voltage
  • Reverse voltage
  • Counter voltage

9. What is the symbol for Inductance?

  • I
  • Z
  • XL
  • L

10. 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

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

  • Ohm
  • Henry
  • Ampere turns
  • Webers/meter

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

  • C = Q/V
  • V = C×Q
  • Q = C/V
  • Q = V/C

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

  • henry
  • dielectric
  • core
  • center

14. Which of the following  electrical symbols is used to represent the electrical component shown above in a circuit?

15. Transformer core are laminated in order to

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

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

  • Open
  • Short
  • Polar
  • Non-polar

17. Inductor cores can be made of

  • air
  • iron
  • magnetic materials
  • all of these

18. Inductive reactance is expressed as

  • 1/2πfL
  • 2πfL
  • f/2πL
  • X

19. 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

20. 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

21. 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

22. 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

23. 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

24. Lamination of transformer core is made of

  • Cast Iron
  • Silicon Steel
  • Aluminium
  • Cast Steel

25. Neutrons have a __________ charge.

  • Negative
  • Positive
  • Neutral

26. 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

27. Two small hollow metal spheres hung on insulating threads attract one another as shown. It is known that a positively charged rod will attract sphere A. Which statements can be correctly concluded about the charge on the spheres?

  • A has a positive charge
  • B has a negative charge
  • A and B have opposite charges
  • A is neutral

28. 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

29. A balloon has a negative charge.  The glass rod has a positive charge.  What will happen when the glass rod is brought near the balloon?

  • The balloon will be attracted to the rod
  • The balloon will be repelled by the rod
  • The balloon will remain in place
  • The balloon will spin in circles

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

  • closer
  • further
  • stronger
  • weaker

31. 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

32. What types of charges repel?

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

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

  • neutrons
  • protons
  • electrons
  • none of these

34. Charged objects can be attracted to:

  • Neutral objects 
  • Objects with the opposite charge
  • Both

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

  • .Frequency
  • .Voltage
  • .Current
  • Any of the above

36. 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

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

  • Increase
  • Decrease
  • Remain the same
  • Any of the above

38. 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

39. 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

40. Select all images showing a type of inductor.

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

  • air
  • ceramic
  • glass
  • copper

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

  • Resistance
  • Capacitance
  • Inductance
  • Dielectric constant

43. What is the unit of measurement for capacitance?

  • Maxwells
  • Farads
  • Henries
  • Watts

44. Capacitors are identified by which two values?

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

45. Two common inductor cores are ___________.

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

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

  • impedance
  • the alternating current
  • the number of turns
  • impedance

47. Inductor stores energy in the form of

  • Electric field
  • Electromagnetic field
  • Magnetic field
  • None of the above

48. Mutual inductance is NOT dependant on which of the following:

  • number of turns
  • physical size of each coil
  • Position of coils
  • thickness of wire

49. The current induced in a second piece of wire develops it's own magnetic field which in turn will induce a current in the original wire of reverse polarity. What is this called?

  • Opposite/opposing reactance
  • Counter/Back EMF
  • Mirror Effect
  • Magic

50. Electromagnetic induction can occur in any conductor, regardless of whether it's a straight piece of wire or coil.

  • True
  • False

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