Electrical Engineering MCQ Questions Answers [Top 50]

Electrical Engineering MCQ Questions Answers: We are going to cover MCQs on the same topic.

Electrical Engineering MCQ | Electrical Engineering Materials PDF

1. What is the primary function of an insulating material in electrical applications?

a. To conduct electricity

b. To store electrical energy

c. To insulate and prevent the flow of electric current

d. To increase resistance in a circuit

Answer: c. To insulate and prevent the flow of electric current

2. Which of the following is a semiconductor material?

a. Copper

b. Silicon

c. Aluminum

d. Iron

Answer: b. Silicon

3. What is the main advantage of using superconductors in electrical applications?

a. Low resistance

b. High temperature tolerance

c. Good thermal conductivity

d. High mechanical strength

Answer: a. Low resistance

4. In the context of magnetic materials, what does “permeability” refer to?

a. Ability to resist deformation

b. Ability to conduct electricity

c. Ability to support a magnetic field

d. Ability to absorb light

Answer: c. Ability to support a magnetic field

5. What is the primary constituent of a thermocouple used for temperature measurement?

a. Copper

b. Aluminum

c. Nickel

d. Chromium

Answer: c. Nickel

6. Which of the following materials is commonly used as a dielectric in capacitors?

a. Copper

b. Glass

c. Silver

d. Iron

Answer: b. Glass

7. What is the purpose of a varistor in an electrical circuit?

a. To control voltage

b. To regulate current

c. To provide resistance

d. To protect against voltage surges

Answer: d. To protect against voltage surges

8. Which type of material is used in the core of a transformer to enhance magnetic coupling?

a. Insulator

b. Conductor

c. Semiconductor

d. Ferromagnetic material

Answer: d. Ferromagnetic material

9. What property of a material is characterized by the ratio of the electric field strength to the electric flux density?

a. Permittivity

b. Conductivity

c. Resistivity

d. Magnetic susceptibility

Answer: a. Permittivity

10. What is the primary purpose of a fuse in an electrical circuit?

a. To control current flow

b. To measure voltage

c. To store electrical energy

d. To protect against overcurrent

Answer: d. To protect against overcurrent

11. What is the typical composition of a piezoelectric material used in sensors and actuators?

a. Ferromagnetic

b. Ferroelectric

c. Semiconductive

d. Superconductive

Answer: b. Ferroelectric

12. Which property makes carbon suitable for use in resistors and electrodes?

a. High thermal conductivity

b. Low resistivity

c. Variable resistance

d. Superconductivity

Answer: c. Variable resistance

13. In the context of semiconductors, what does the term “doping” refer to?

a. Adding impurities to alter conductivity

b. Cleaning the surface of the material

c. Polishing the material for smoothness

d. Increasing the melting point of the material

Answer: a. Adding impurities to alter conductivity

14. What type of material is commonly used as a core in inductors?

a. Insulator

b. Ferromagnetic material

c. Semiconductor

d. Superconductor

Answer: b. Ferromagnetic material

15. Which material is commonly used as a protective coating for copper wires to prevent corrosion?

a. Aluminum

b. Gold

c. Silver

d. Insulating varnish

Answer: d. Insulating varnish

16. What is the primary purpose of a thermistor in an electrical circuit?

a. To regulate current

b. To measure temperature

c. To store thermal energy

d. To amplify signals

Answer: b. To measure temperature

17. What property of a material determines its ability to conduct an electric current under the influence of an electric field?

a. Permittivity

b. Conductivity

c. Resistivity

d. Magnetic susceptibility

Answer: b. Conductivity

18. Which of the following materials is commonly used in the fabrication of integrated circuits (ICs)?

a. Copper

b. Silicon

c. Aluminum

d. Gold

Answer: b. Silicon

19. What is the primary purpose of a photoresistor in an electrical circuit?

a. To control current flow

b. To measure light intensity

c. To store electrical energy

d. To regulate voltage

Answer: b. To measure light intensity

20. Which type of material is used as a core in high-frequency transformers due to its low hysteresis loss?

a. Ferrite

b. Silicon steel

c. Nickel

d. Cobalt

Answer: a. Ferrite

21. What is the primary role of a surge arrester in an electrical system?

a. To regulate voltage

b. To protect against lightning strikes and voltage surges

c. To store electrical energy

d. To amplify signals

Answer: b. To protect against lightning strikes and voltage surges

22. Which of the following materials is commonly used as a magnetic shield in electronic devices?

a. Copper

b. Aluminum

c. Mu-metal

d. Gold

Answer: c. Mu-metal

23. What property of a material is characterized by its ability to generate an electric voltage when subjected to mechanical stress?

a. Conductivity

b. Piezoelectricity

c. Ferromagnetism

d. Superconductivity

Answer: b. Piezoelectricity

24. In the context of insulating materials, what is the purpose of adding plasticizers?

a. To increase stiffness

b. To enhance thermal conductivity

c. To improve flexibility

d. To reduce electrical resistance

Answer: c. To improve flexibility

25. Which material is commonly used as a core in transformers operating at high frequencies?

a. Silicon steel

b. Ferrite

c. Copper

d. Aluminum

Answer: b. Ferrite

26. What type of material is used as a sensing element in resistive temperature detectors (RTDs)?

a. Platinum

b. Copper

c. Nickel

d. Aluminum

Answer: a. Platinum

27. Which property of a material determines its ability to store electrical energy in a capacitor?

a. Permittivity

b. Conductivity

c. Resistivity

d. Magnetic susceptibility

Answer: a. Permittivity

28. What is the primary purpose of a solenoid in an electrical circuit?

a. To convert electrical energy to mechanical energy

b. To store magnetic energy

c. To amplify signals

d. To regulate current flow

Answer: a. To convert electrical energy to mechanical energy

29. Which material is commonly used as an insulator in high-voltage applications?

a. Rubber

b. Glass

c. Teflon

d. Polyethylene

Answer: c. Teflon

30. What is the primary function of a rectifier in an electrical circuit?

a. To convert AC to DC

b. To control current flow

c. To amplify signals

d. To store electrical energy

Answer: a. To convert AC to DC

31. What property of a material is characterized by its ability to oppose the flow of alternating current (AC)?

a. Resistance

b. Inductance

c. Conductance

d. Capacitance

Answer: b. Inductance

32. Which material is commonly used as a dielectric in ceramic capacitors?

a. Aluminum

b. Tantalum

c. Barium titanate

d. Silver

Answer: c. Barium titanate

33. What is the primary purpose of a magnetic amplifier in electrical circuits?

a. To amplify electrical signals

b. To regulate voltage

c. To control the flow of magnetic flux

d. To store magnetic energy

Answer: c. To control the flow of magnetic flux

34. Which of the following materials exhibits a negative temperature coefficient of resistance (NTC)?

a. Copper

b. Silicon

c. Germanium

d. Carbon (Graphite)

Answer: d. Carbon (Graphite)

35. What is the primary role of a shunt resistor in a circuit?

a. To measure voltage

b. To control current flow

c. To store electrical energy

d. To regulate temperature

Answer: b. To control current flow

36. In a transformer, which winding is typically connected to the power source?

a. Primary winding

b. Secondary winding

c. Tertiary winding

d. Autotransformer winding

Answer: a. Primary winding

37. Which material is commonly used as a thermal conductor in heat sinks for electronic devices?

a. Aluminum

b. Copper

c. Silver

d. Gold

Answer: b. Copper

38. What is the primary function of a relay in an electrical system?

a. To convert electrical energy to mechanical energy

b. To amplify signals

c. To control the opening and closing of circuits

d. To store electrical energy

Answer: c. To control the opening and closing of circuits

39. What is the primary purpose of a photoelectric sensor in industrial applications?

a. To measure temperature

b. To detect light intensity

c. To control current flow

d. To convert electrical energy to mechanical energy

Answer: b. To detect light intensity

40. Which of the following materials is commonly used in the construction of magnetic coils for inductors and transformers?

a. Brass

b. Aluminum

c. Copper

d. Iron

Answer: c. Copper

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41. What is the primary purpose of a surge suppressor in electronic devices?

a. To regulate voltage

b. To protect against voltage spikes

c. To amplify signals

d. To store electrical energy

Answer: b. To protect against voltage spikes

42. Which material is commonly used as a core in high-frequency inductors due to its high magnetic permeability?

a. Aluminum

b. Ferrite

c. Copper

d. Gold

Answer: b. Ferrite

43. What property of a material is characterized by its ability to generate heat when subjected to an electric current?

a. Resistance

b. Conductance

c. Capacitance

d. Permittivity

Answer: a. Resistance

44. In the context of insulating materials, what does the term “breakdown voltage” refer to?

a. Voltage required to initiate breakdown

b. Voltage drop across a material

c. Maximum safe voltage

d. Voltage generated during breakdown

Answer: a. Voltage required to initiate breakdown

45. Which of the following materials is commonly used as a conductor in overhead power transmission lines?

a. Copper

b. Aluminum

c. Silver

d. Gold

Answer: b. Aluminum

46. What is the primary purpose of a thyristor in power electronics?

a. To measure resistance

b. To amplify signals

c. To regulate current flow

d. To control the power flow in a circuit

Answer: d. To control the power flow in a circuit

47. Which material is commonly used as a core in transformers for low-frequency applications?

a. Ferrite

b. Silicon steel

c. Copper

d. Aluminum

Answer: b. Silicon steel

48. What is the primary function of a capacitor in an AC circuit?

a. To store electrical energy

b. To regulate voltage

c. To control current flow

d. To convert AC to DC

Answer: b. To regulate voltage

49. In the context of conductors, what is the purpose of stranding wires together?

a. To increase resistance

b. To decrease flexibility

c. To enhance strength and flexibility

d. To decrease conductivity

Answer: c. To enhance strength and flexibility

50. Which of the following materials is commonly used as a magnetic tape for data storage?

a. Aluminum

b. Copper

c. Iron

d. Cobalt

Answer: c. Iron

51. What property of a material is crucial for its suitability in high-frequency applications, such as RF circuits?

a. Permittivity

b. Conductivity

c. Resistivity

d. Magnetic susceptibility

Answer: a. Permittivity

52. Which material is commonly used as a sacrificial anode to protect metal structures from corrosion?

a. Aluminum

b. Zinc

c. Copper

d. Lead

Answer: b. Zinc

53. In the context of magnetic materials, what is the unit of magnetic flux density (B)?

a. Tesla

b. Ampere

c. Farad

d. Ohm

Answer: a. Tesla

54. What is the primary purpose of a transformer core made of laminated sheets?

a. To increase resistance

b. To decrease inductance

c. To reduce eddy current losses

d. To increase capacitance

Answer: c. To reduce eddy current losses

55. Which property of a material is crucial for its application in high-temperature environments?

a. Conductivity

b. Melting point

c. Resistivity

d. Specific heat capacity

Answer: b. Melting point

56. What is the primary function of a rectifier diode in an electrical circuit?

a. To control current flow

b. To store electrical energy

c. To convert AC to DC

d. To amplify signals

Answer: c. To convert AC to DC

57. Which material is commonly used as a piezoresistor in pressure sensors?

a. Copper

b. Aluminum

c. Silicon

d. Carbon (Graphite)

Answer: c. Silicon

58. What is the primary purpose of a magnetic compass made of a ferromagnetic material?

a. To measure temperature

b. To detect electric fields

c. To determine direction based on Earth’s magnetic field

d. To amplify signals

Answer: c. To determine direction based on Earth’s magnetic field

59. Which material is commonly used as a buffer layer in thin-film solar cells?

a. Copper

b. Silicon

c. Cadmium telluride

d. Aluminum

Answer: c. Cadmium telluride

60. What is the primary role of a varactor diode in electronic circuits?

a. To regulate voltage

b. To store electrical energy

c. To control capacitance

d. To amplify signals

Answer: c. To control capacitance

61. What is the primary purpose of a thermocouple in temperature measurement?

a. To measure electrical resistance

b. To generate an electromotive force (EMF) proportional to temperature

c. To control current flow

d. To amplify signals

Answer: b. To generate an electromotive force (EMF) proportional to temperature

62. Which material is commonly used as a cladding layer in optical fibers to enhance light transmission?

a. Copper

b. Aluminum

c. Silicon

d. Glass

Answer: d. Glass

63. In the context of semiconductors, what is the purpose of a P-type dopant?

a. To increase electron concentration

b. To increase hole concentration

c. To reduce conductivity

d. To enhance thermal conductivity

Answer: b. To increase hole concentration

64. What is the primary function of a rheostat in an electrical circuit?

a. To regulate voltage

b. To control current flow by changing resistance

c. To store electrical energy

d. To amplify signals

Answer: b. To control current flow by changing resistance

65. Which material is commonly used as a thermal interface material to improve heat transfer between electronic components and heat sinks?

a. Rubber

b. Copper

c. Silicon grease

d. Teflon

Answer: c. Silicon grease

66. What is the primary role of a fuse in an electrical system?

a. To regulate voltage

b. To control current flow

c. To store electrical energy

d. To protect against overcurrent

Answer: d. To protect against overcurrent

67. Which material is commonly used as a protective coating for electrical wires to resist moisture and corrosion?

a. PVC (Polyvinyl chloride)

b. Polyethylene

c. Teflon

d. Rubber

Answer: a. PVC (Polyvinyl chloride)

68. What is the primary purpose of a diode in a rectifier circuit?

a. To control current flow

b. To store electrical energy

c. To amplify signals

d. To allow current flow in one direction

Answer: d. To allow current flow in one direction

69. Which property of a material is characterized by its ability to generate a voltage when exposed to light?

a. Conductivity

b. Photoconductivity

c. Resistivity

d. Capacitance

Answer: b. Photoconductivity

70. What is the primary function of a capacitor in a timing circuit or oscillator?

a. To store electrical energy

b. To regulate voltage

c. To control current flow

d. To amplify signals

Answer: a. To store electrical energy

71. What is the primary purpose of a Schottky diode in electronic circuits?

a. To regulate voltage

b. To control current flow

c. To convert AC to DC

d. To reduce switching time in high-frequency applications

Answer: d. To reduce switching time in high-frequency applications

72. Which material is commonly used as a core in transformers for power distribution at low frequencies?

a. Ferrite

b. Silicon steel

c. Copper

d. Aluminum

Answer: b. Silicon steel

73. In the context of semiconductor devices, what is the primary function of a field-effect transistor (FET)?

a. To amplify signals

b. To control current flow

c. To convert AC to DC

d. To store electrical energy

Answer: b. To control current flow

74. What is the primary purpose of a zener diode in a voltage regulation circuit?

a. To convert AC to DC

b. To control current flow

c. To amplify signals

d. To maintain a constant voltage

Answer: d. To maintain a constant voltage

75. Which material is commonly used as a core in toroidal inductors?

a. Ferrite

b. Silicon steel

c. Copper

d. Aluminum

Answer: a. Ferrite

76. What is the primary role of a MOV (Metal Oxide Varistor) in an electrical circuit?

a. To regulate voltage

b. To store electrical energy

c. To protect against voltage surges

d. To control current flow

Answer: c. To protect against voltage surges

77. Which material is commonly used as a dielectric in electrolytic capacitors?

a. Aluminum

b. Tantalum

c. Polyethylene

d. Mylar

Answer: b. Tantalum

78. In the context of magnetic materials, what does the term “coercivity” refer to?

a. Ability to conduct electricity

b. Ability to retain magnetization

c. Ability to support a magnetic field

d. Ability to absorb light

Answer: b. Ability to retain magnetization

79. What is the primary function of a photoconductive cell (LDR) in electronic devices?

a. To measure temperature

b. To detect light intensity

c. To control current flow

d. To convert AC to DC

Answer: b. To detect light intensity

80. Which material is commonly used as a semiconductor in solar cells to convert sunlight into electricity?

a. Silicon

b. Copper

c. Aluminum

d. Tungsten

Answer: a. Silicon

81. What is the primary function of a silicon-controlled rectifier (SCR) in power electronics?

a. To control current flow

b. To amplify signals

c. To convert AC to DC

d. To protect against voltage surges

Answer: a. To control current flow

82. Which material is commonly used as a resistive element in potentiometers?

a. Copper

b. Aluminum

c. Carbon

d. Tungsten

Answer: c. Carbon

83. In the context of magnetic materials, what is the purpose of annealing?

a. To increase magnetic susceptibility

b. To reduce coercivity

c. To increase resistivity

d. To decrease permeability

Answer: b. To reduce coercivity

84. What property of a material determines its ability to store electrical charge in a capacitor?

a. Conductivity

b. Permittivity

c. Resistivity

d. Capacitance

Answer: b. Permittivity

85. Which material is commonly used as a substrate in printed circuit boards (PCBs)?

a. Aluminum

b. Copper

c. Fiberglass epoxy

d. Silicon

Answer: c. Fiberglass epoxy

86. What is the primary purpose of a MOV (Metal Oxide Varistor) in an electrical circuit?

a. To regulate voltage

b. To store electrical energy

c. To protect against voltage surges

d. To control current flow

Answer: c. To protect against voltage surges

87. In the context of capacitors, what is the function of the dielectric material?

a. To control current flow

b. To store electrical energy

c. To regulate voltage

d. To increase capacitance

Answer: b. To store electrical energy

88. Which material is commonly used as a heating element in electric heaters and toasters?

a. Copper

b. Nichrome

c. Aluminum

d. Tungsten

Answer: b. Nichrome

89. What is the primary purpose of a phase-locked loop (PLL) in electronic circuits?

a. To control current flow

b. To amplify signals

c. To generate a stable frequency

d. To regulate voltage

Answer: c. To generate a stable frequency

90. Which material is commonly used as an insulator in high-voltage power cables?

a. PVC (Polyvinyl chloride)

b. Rubber

c. Teflon

d. Polyethylene

Answer: a. PVC (Polyvinyl chloride)

91. What is the primary function of a magnetic core in an inductor or transformer?

a. To store magnetic energy

b. To increase resistance

c. To reduce eddy current losses

d. To regulate voltage

Answer: a. To store magnetic energy

92. Which material is commonly used as a semiconductor in light-emitting diodes (LEDs)?

a. Silicon

b. Gallium arsenide

c. Aluminum

d. Tungsten

Answer: b. Gallium arsenide

93. In the context of resistors, what does the term “tolerance” refer to?

a. Temperature coefficient

b. Power rating

c. Manufacturing precision

d. Resistance variation from the specified value

Answer: d. Resistance variation from the specified value

94. What is the primary purpose of a photoconductive cell (LDR) in automatic lighting systems?

a. To measure temperature

b. To detect light intensity

c. To regulate voltage

d. To amplify signals

Answer: b. To detect light intensity

95. Which material is commonly used as a dielectric in electrolytic capacitors?

a. Aluminum oxide

b. Tantalum oxide

c. Polyethylene

d. Mylar

Answer: a. Aluminum oxide

96. In the context of transistors, what is the function of the emitter terminal in a bipolar junction transistor (BJT)?

a. To control current flow

b. To provide an input signal

c. To amplify signals

d. To emit charge carriers

Answer: d. To emit charge carriers

97. Which property of a material is characterized by its ability to resist the flow of direct current (DC)?

a. Conductivity

b. Inductance

c. Resistance

d. Capacitance

Answer: c. Resistance

98. What is the primary purpose of a flyback diode (freewheeling diode) in a relay circuit?

a. To control current flow

b. To store electrical energy

c. To protect against voltage spikes

d. To regulate voltage

Answer: c. To protect against voltage spikes

99. Which material is commonly used as a core in variable inductors for tuning circuits?

a. Ferrite

b. Silicon steel

c. Copper

d. Iron powder

Answer: d. Iron powder

100. What is the primary purpose of a capacitor in a filter circuit?

a. To store electrical energy

b. To regulate voltage

c. To control current flow

d. To convert AC to DC

Answer: c. To control current flow

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