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. 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

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

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

4. Lamination of transformer core is made of

  • Cast Iron
  • Silicon Steel
  • Aluminium
  • Cast Steel

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

  • Open
  • Short
  • Polar
  • Non-polar

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

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

7. Inductor stores energy in the form of

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

8. 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

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

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

10. 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

11. 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
  • None of these

12. Neutrons have a __________ charge.

  • Negative
  • Positive
  • Neutral
  • None of these

13. 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
  • All of above

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

  • closer
  • further
  • stronger
  • weaker

15. Charged objects can be attracted to:

  • Neutral objects 
  • Objects with the opposite charge
  • Both
  • Both A & B

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

  • neutrons
  • protons
  • electrons
  • none of these

17. What types of charges repel?

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

18. 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

19. 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

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

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

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

  • henry
  • dielectric
  • core
  • center

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

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

23. Two common inductor cores are ___________.

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

24. Capacitors are identified by which two values?

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

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

  • air
  • ceramic
  • glass
  • copper

26. What is the unit of measurement for capacitance?

  • Maxwells
  • Farads
  • Henries
  • Watts

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

  • Resistance
  • Capacitance
  • Inductance
  • Dielectric constant

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

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

29. 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

30. 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

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

  • Ohm
  • Henry
  • Ampere turns
  • Webers/meter

32. 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

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

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

34. Transformer core are laminated in order to

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

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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