Electrical and Electronics Engineering MCQs

1. What is the unit of electrical resistance? A) Volt B) Ampere C) Ohm D) Watt Answer: C) Ohm 2. What is the function of a diode? A) To store charge B) To amplify signals C) To allow current to flow in one direction only D) To resist the flow of current Answer: C) To allow current to flow in one direction only 3. What is the SI unit of electric current? A) Coulomb B) Volt C) Ampere D) Ohm Answer: C) Ampere 4. Which component is used to store energy in an electric field? A) Resistor B) Inductor C) Capacitor D) Transformer Answer: C) Capacitor 5. Ohm’s law states that the current through a conductor between two points is directly proportional to the voltage across the two points. True or False? A) True B) False Answer: A) True 6. What is the primary function of a transformer? A) To convert AC to DC B) To increase or decrease AC voltage C) To store electrical energy D) To convert electrical energy to mechanical energy Answer: B) To increase or decrease AC voltage 7. In an RLC circuit, which component stores energy in a magnetic field? A) Resistor B) Inductor C) Capacitor D) Diode Answer: B) Inductor 8. Which of the following is a type of semiconductor? A) Gold B) Silicon C) Copper D) Iron Answer: B) Silicon 9. Kirchhoff’s Voltage Law (KVL) states that the sum of all voltages around a closed loop is equal to: A) Zero B) One C) Infinity D) The total resistance Answer: A) Zero 10. What is the main purpose of a fuse in an electrical circuit? A) To amplify signals B) To protect the circuit from overcurrent C) To store energy D) To convert AC to DC Answer: B) To protect the circuit from overcurrent 11. Which device is used to measure electrical current? A) Voltmeter B) Ohmmeter C) Ammeter D) Wattmeter Answer: C) Ammeter 12. The property of a material that opposes the flow of electric current is known as: A) Conductance B) Resistance C) Capacitance D) Inductance Answer: B) Resistance 13. Which of the following materials is a good conductor of electricity? A) Rubber B) Glass C) Copper D) Wood Answer: C) Copper 14. The frequency of a standard AC supply in most parts of the world is: A) 50 Hz B) 60 Hz C) 100 Hz D) 120 Hz Answer: A) 50 Hz 15. In a parallel circuit, the total resistance is: A) Greater than the smallest resistance B) Equal to the sum of all resistances C) Less than the smallest resistance D) Equal to the largest resistance Answer: C) Less than the smallest resistance 16. Which of the following is used to convert AC to DC? A) Transformer B) Rectifier C) Inverter D) Inductor Answer: B) Rectifier 17. What is the power factor of a purely resistive circuit? A) 0 B) 0.5 C) 1 D) -1 Answer: C) 1 18. What does LED stand for? A) Light Emitting Diode B) Low Energy Device C) Light Energy Detector D) Linear Emission Device Answer: A) Light Emitting Diode 19. Which type of motor is commonly used in household appliances? A) Stepper motor B) Servo motor C) Induction motor D) Synchronous motor Answer: C) Induction motor 20. The energy stored in a capacitor is given by which formula? A)

12CV2\frac{1}{2} C V^2

C V

12LI2\frac{1}{2} L I^2

I V t

Answer: A) $12CV2\frac{1}{2} C V^2$

Electrical and Electronics Engineering MCQs

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