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Useful for Kerala PSC Electrician, Overseer, Sub Engineer, AE, KSEB, and Technical Exams
Topics Covered: Ohm’s Law, Electrical Units, AC/DC, Transformers, Motors, Generators, Wiring, Safety Devices, Power, and Basic Electrical Engineering.
1. What is Ohm’s Law?
Answer: V = IR
2. What is the SI unit of electric current?
Answer: Ampere (A)
3. What is the SI unit of resistance?
Answer: Ohm (ฮฉ)
4. Which instrument measures voltage?
Answer: Voltmeter
5. Which instrument measures current?
Answer: Ammeter
6. What is the unit of electrical power?
Answer: Watt (W)
7. What is the formula for electrical power?
Answer: P = VI
8. What does AC stand for?
Answer: Alternating Current
9. What does DC stand for?
Answer: Direct Current
10. What is the frequency of AC supply in India?
Answer: 50 Hz
11. On which principle does a transformer work?
Answer: Mutual induction
12. A transformer works only with which type of current?
Answer: AC
13. What does a step-up transformer do?
Answer: Increases voltage
14. What does a step-down transformer do?
Answer: Decreases voltage
15. What is the commercial unit of electrical energy?
Answer: Kilowatt-hour (kWh)
16. Which material is commonly used for electrical wiring?
Answer: Copper
17. Which device protects a circuit from overcurrent?
Answer: Fuse
18. What is the function of earthing?
Answer: Protection from electric shock
19. What is MCB?
Answer: Miniature Circuit Breaker
20. What is RCCB used for?
Answer: Protection against leakage current
21. Which law states that induced EMF opposes the cause producing it?
Answer: Lenz’s Law
22. Which law explains electromagnetic induction?
Answer: Faraday’s Law
23. Which motor is commonly used in ceiling fans?
Answer: Single-phase induction motor
24. Which motor has high starting torque?
Answer: DC series motor
25. What is the power factor of a purely resistive circuit?
Answer: 1
26. What is the phase difference between voltage and current in a purely inductive circuit?
Answer: 90°
27. Which device measures insulation resistance?
Answer: Megger
28. What is the SI unit of frequency?
Answer: Hertz (Hz)
29. Which device converts mechanical energy into electrical energy?
Answer: Generator
30. Which device converts electrical energy into mechanical energy?
Answer: Motor
31. What is the color of the earth wire in modern wiring?
Answer: Green or Green-Yellow
32. What is the purpose of a capacitor?
Answer: To store electrical charge
33. What is the unit of capacitance?
Answer: Farad (F)
34. What is the unit of inductance?
Answer: Henry (H)
35. What is the value of power factor for a purely capacitive circuit?
Answer: 0
36. Which core is commonly used in power transformers?
Answer: Laminated silicon steel core
37. Which transformer is used in measuring instruments?
Answer: Instrument transformer
38. What is the efficiency of an ideal transformer?
Answer: 100%
39. Which conductor has lower resistivity?
Answer: Silver
40. What is the resistance of an ideal conductor?
Answer: Zero
41. What is the resistance of an ideal insulator?
Answer: Infinite
42. What happens to resistance when the length of a conductor increases?
Answer: Resistance increases
43. What happens to resistance when the cross-sectional area increases?
Answer: Resistance decreases
44. Which law relates resistance with length and area of a conductor?
Answer: R = ฯL/A
45. Which battery is commonly used in automobiles?
Answer: Lead-acid battery
46. What is the nominal voltage of a lead-acid cell?
Answer: 2 V
47. Which law is used to analyze complex electrical networks?
Answer: Kirchhoff’s Laws
48. What is the purpose of a relay?
Answer: To control a circuit automatically
49. What is the typical domestic supply voltage in India?
Answer: 230 V
50. Which safety device disconnects the supply when leakage current is detected?
Answer: RCCB / ELCB
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