Introduction to Electrical Engineering MCQs January 8, 2026July 11, 2024 by u930973931_answers 42 min Score: 0 Attempted: 0/42 Subscribe 1. What is the SI unit of electric charge? (A) Volt (B) Ampere (C) Coulomb (D) Ohm 2. Which of the following materials is a good conductor of electricity? (A) Glass (B) Rubber (C) PVC (D) Copper 3. In which type of circuit are the elements connected end-to-end with no branching? (A) Series (B) Parallel (C) Series-parallel (D) None of the above 4. What is the unit of electrical resistance? (A) Farad (B) Tesla (C) Henry (D) Ohm 5. Which law states that the voltage across a resistor is directly proportional to the current passing through it, assuming constant temperature? (A) Kirchhoff’s current law (B) Kirchhoff’s voltage law (C) Ohm’s law (D) Watt’s law 6. Which type of material allows electric charges to flow freely? (A) Insulator (B) Conductor (C) Semiconductor (D) Dielectric 7. What is the SI unit of electric potential difference? (A) Coulomb (B) Ampere (C) Volt (D) Ohm 8. Which instrument is used to measure electric current? (A) Voltmeter (B) Multimeter (C) Galvanometer (D) Ammeter 9. What does the acronym AC stand for in electrical terms? (A) Alternating Capacitance (B) Alternating Charge (C) Alternating Current (D) Alternating Circuit 10. What is the standard voltage of a typical household electrical outlet in most countries? (A) 110 V (B) 220 V (C) 240 V (D) 120 V 11. Which device is used to store electrical energy temporarily in an electrical circuit? (A) Resistor (B) Inductor (C) Capacitor (D) Transformer 12. What is the purpose of a diode in an electrical circuit? (A) To store energy (B) To control voltage (C) To amplify signals (D) To rectify AC to DC 13. Which law states that the algebraic sum of currents entering and leaving a junction is zero? (A) Ohm’s law (B) Kirchhoff’s voltage law (C) Kirchhoff’s current law (D) Watt’s law 14. What type of motor operates on the interaction between stator and rotor magnetic fields? (A) DC motor (B) Induction motor (C) Synchronous motor (D) Stepper motor 15. Which device is used to protect electrical appliances from power surges? (A) Fuse (B) Transformer (C) Circuit breaker (D) Relay 16. In an electrical circuit, what does a resistor do? (A) Increases current (B) Decreases voltage (C) Limits current flow (D) Stores energy 17. Which phenomenon occurs when a voltage is induced in a conductor by a changing magnetic field? (A) Electromagnetic induction (B) Capacitance (C) Resistance (D) Inductance 18. What is the unit of frequency? (A) Watt (B) Hertz (C) Joule (D) Tesla 19. Which law states that the total electric flux through a closed surface is equal to the charge enclosed divided by the permittivity of the medium? (A) Gauss’s law (B) Coulomb’s law (C) Ampère’s law (D) Faraday’s law 20. Which type of electrical generator produces a DC output? (A) Alternator (B) Rectifier (C) Transformer (D) Dynamo 21. What is the function of an inductor in an electrical circuit? (A) To store energy (B) To control voltage (C) To provide resistance (D) To store magnetic energy 22. What is the primary function of a transformer in an electrical circuit? (A) To convert AC to DC (B) To decrease current (C) To increase voltage (D) To amplify signals 23. Which type of material has electrical properties between conductors and insulators? (A) Semiconductor (B) Insulator (C) Conductor (D) Dielectric 24. Which component is used to store electrical charge? (A) Resistor (B) Inductor (C) Capacitor (D) Transformer 25. What is the SI unit of power? (A) Volt (B) Ampere (C) Watt (D) Ohm 26. Which device converts electrical energy into mechanical energy? (A) Capacitor (B) Resistor (C) Diode (D) Motor 27. What is the unit of electrical conductance? (A) Ohm (B) Coulomb (C) Henry (D) Siemens 28. Which type of electrical circuit has multiple paths for current flow? (A) Series (B) Parallel (C) Series-parallel (D) None of the above 29. Which law states that the sum of voltages in a closed loop equals the sum of voltage drops? (A) Ohm’s law (B) Kirchhoff’s current law (C) Kirchhoff’s voltage law (D) Watt’s law 30. Which type of material has very high resistance to electric current? (A) Conductor (B) Dielectric (C) Semiconductor (D) Insulator 31. What is the purpose of a rectifier in an electrical circuit? (A) To store energy (B) To amplify signals (C) To convert AC to DC (D) To control voltage 32. Which law describes the force between two electric charges? (A) Ohm’s law (B) Ampère’s law (C) Faraday’s law (D) Coulomb’s law 33. What is the SI unit of electrical capacitance? (A) Gauss (B) Henry (C) Tesla (D) Farad 34. Which type of electrical connection increases total resistance? (A) Series-parallel (B) Parallel (C) Series (D) Depends on values 35. What is the purpose of a fuse in an electrical circuit? (A) To protect against overcurrent (B) To store energy (C) To regulate voltage (D) To convert AC to DC 36. Which device is used to change voltage level? (A) Fuse (B) Relay (C) Transformer (D) Capacitor 37. What is the unit of magnetic flux density? (A) Gauss (B) Weber (C) Tesla (D) Ampere-turn 38. Which law relates magnetic field to electric current? (A) Ampère’s law (B) Coulomb’s law (C) Ohm’s law (D) Faraday’s law 39. What is the function of a relay in an electrical circuit? (A) To convert AC to DC (B) To control high-power circuits using low-power signals (C) To protect against overcurrent (D) To amplify signals 40. Which component converts mechanical motion into electrical energy? (A) Capacitor (B) Resistor (C) Diode (D) Generator 41. What is the SI unit of magnetic flux? (A) Gauss (B) Tesla (C) Weber (D) Ampere-turn 42. Which law states that induced EMF equals the rate of change of magnetic flux? (A) Faraday’s law (B) Coulomb’s law (C) Ampère’s law (D) Ohm’s law