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Electric Drives MCQs

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1. Which of the following is not a type of electric drive?





2. In an electric drive system, the function of the controller is to:





3. The speed-torque characteristic of a DC motor is typically:





4. Slip in an induction motor is defined as:





5. The speed of a synchronous motor is:





6. Which of the following is not a method of speed control for DC motors?





7. In an electric drive system, PID control is used for:





8. The power factor of an electric drive system can be improved by using:





9. Which of the following motors is most suitable for applications requiring precise position and speed control?





10. The starting torque of a synchronous motor is:





11. Which motor is preferred for traction applications such as electric trains?





12. A VFD (Variable Frequency Drive) is used to control the speed of:





13. The braking of a DC motor can be achieved by:





14. In a Ward Leonard control system, the motor-generator set is used for:





15. Which of the following is not a method of improving the efficiency of electric drives?





16. The torque developed by a DC motor is proportional to:





17. A cycloconverter is used to convert:





18. The speed of a DC shunt motor is approximately proportional to:





19. In a vector control method for AC motors, the control variables are:





20. A regenerative braking system is used to:





21. The speed of an induction motor can be controlled by varying the:





22. Which motor is most commonly used in household appliances like fans and pumps?





23. A buck-boost converter is used to:





24. The rotor of a synchronous motor is rotated at:





25. The efficiency of an electric drive system is highest when:





26. The speed of a permanent magnet synchronous motor is controlled by varying the:





27. Which motor is used in cranes and hoists for its high starting torque?





28. A Cycloconverter is used for:





29. The direction of rotation of a DC motor can be reversed by reversing:





30. The efficiency of an electric drive is defined as:





31. The duty cycle in PWM control of motors refers to:





32. Which of the following is not a method of speed control in AC motors?





33. The braking torque in an electric drive is proportional to:





34. A sensorless control technique for motors uses:





35. The torque developed by an induction motor is approximately proportional to:





36. The efficiency of an electric motor can be improved by:





37. Which motor type is preferred for applications requiring high starting torque?





38. The power factor of an electric motor can be improved by:





39. A DC chopper is used for:





40. Which motor is not suitable for applications requiring constant speed operation?





41. A four-quadrant operation of a DC motor is possible with:





42. In a VFD, the DC link voltage is:





43. The starting torque of a single-phase induction motor is:





44. In a servo motor, feedback is typically provided by:





45. Which motor type has the highest efficiency among the following?





46. The torque developed by a permanent magnet DC motor is proportional to:





47. A VFD converts:





48. In a DC series motor, speed regulation is:





49. The main advantage of a brushless DC motor (BLDC) over a brushed DC motor is:





50. The power rating of an electric drive system is typically measured in:





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