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Power Control Systems MCQs

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1. 1. Which device is used for power factor improvement in AC circuits?





2. 2. In a three-phase power system, what is the phase angle between each phase?





3. 3. The purpose of a transformer in a power system is to:





4. 4. In a synchronous generator, the speed of rotation is synchronized with the:





5. 5. Which of the following devices can protect electrical equipment from voltage surges?





6. 6. A device used to convert DC power to AC power is called a:





7. 7. The unit of electrical power is:





8. 8. In a power transmission line, which parameter is primarily controlled to minimize transmission losses?





9. 9. The process of maintaining constant voltage in a power system despite variations in load is called:





10. 10. A device used to protect an electric circuit from excessive current is called a:





11. 11. Which type of motor is preferred for high starting torque applications?





12. 12. The power factor of an inductive circuit can be improved by connecting a:





13. 13. The energy stored in an inductor is proportional to:





14. 14. Which device is used to convert high-voltage AC power to low-voltage AC power?





15. 15. A circuit breaker is used to:





16. 16. The main advantage of a three-phase system over a single-phase system is:





17. 17. The unit of apparent power in an AC circuit is:





18. 18. Which device is used to convert mechanical energy into electrical energy?





19. 19. What is the function of a step-up transformer?





20. 20. The steady-state response of a control system refers to its response:





21. 21. In an AC circuit, the ratio of real power to apparent power is called:





22. 22. Which type of motor is most commonly used in domestic appliances?





23. 23. The process of converting AC power to DC power is called:





24. 24. Which component is used to store electrical energy in a DC circuit?





25. 25. The speed of a DC motor can be controlled by varying the:





26. 26. Which type of transformer is used to isolate two circuits electrically while transferring power between them?





27. 27. Which device is used to protect a circuit from overvoltage conditions?





28. 28. The reactive power in an AC circuit is measured in:





29. 29. Which type of motor has the highest power density?





30. 30. The function of a relay in an electrical circuit is to:





31. 31. The device used to change the direction of DC current flow periodically is called a:





32. 32. In a transmission line, what does “sag” refer to?





33. 33. A voltage regulator is used to:





34. 34. The device used to protect a circuit from short circuits and overcurrent conditions is a:





35. 35. Which type of motor does not require a starting capacitor or external rotor resistance?





36. 36. The process of adjusting the characteristics of a control system to improve performance is known as:





37. 37. A power system with high power factor:





38. 38. The primary purpose of a capacitor in an AC circuit is to:





39. 39. A buck converter is used to:





40. 40. The unit of frequency is:





41. 41. Which type of motor is suitable for applications requiring precise position control?





42. 42. The process of converting electrical energy into mechanical energy is performed by a:





43. 43. Which type of transformer has a primary winding and a secondary winding that share a magnetic core?





44. 44. A ground fault circuit interrupter (GFCI) is used primarily for:





45. 45. A snubber circuit is used to:





46. 46. The damping ratio of a control system determines its:





47. 47. The Laplace transform is commonly used in control systems to:





48. 48. A flyback converter is commonly used in applications requiring:





49. 49. A soft starter is used to:





50. 50. A PID controller is widely used in control systems because it:





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