Electrical Machine Design MCQs

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1. Which material is commonly used for the core of a transformer?





2. The efficiency of a transformer is highest when operated at:





3. In a transformer, the leakage flux is maximum when the transformer is operating at:





4. Which insulation class can withstand the highest temperature?





5. In an induction motor, slip is defined as:





6. The main purpose of laminating the core in electrical machines is to:





7. The power factor of a transformer is usually improved by:





8. The speed of a DC shunt motor can be controlled by:





9. The braking torque of a DC motor is proportional to:





10. Which law governs the magnetic circuit in electrical machines?





11. The torque developed in a synchronous motor depends on:





12. In a squirrel cage induction motor, rotor bars are usually made of:





13. The speed regulation of a DC motor is defined as the change in speed from:





14. The specific magnetic loading in transformers is typically expressed in:





15. The cogging effect in induction motors is primarily due to:





16. The efficiency of a transformer is defined as:





17. The slip ring in an induction motor is used to:





18. The size of the conductors in electrical machines is determined by:





19. The inrush current in a transformer is highest when:





20. The commutation process in DC machines is necessary to:





21. The regulation of an alternator is defined as the change in voltage from:





22. The armature reaction in DC machines affects primarily the:





23. The losses in a transformer include:





24. The efficiency of a DC generator is maximum when operated at:





25. The method used to reduce the armature reaction in DC machines is:





26. Which of the following statements about transformers is true?





27. The frequency of the induced emf in an alternator depends on:





28. The primary function of the cooling system in electrical machines is to:





29. In an alternator, the armature reaction is responsible for:





30. The insulation resistance of electrical machines is typically measured in:





31. The power factor of a synchronous motor can be improved by:





32. The efficiency of an alternator is defined as:





33. Which type of winding is commonly used in three-phase induction motors?





34. The voltage regulation of a transformer is influenced by:





35. In a DC machine, the interpole is placed:





36. Which material is commonly used for the brushes in DC machines?





37. The temperature rise in electrical machines is primarily due to:





38. The efficiency of an induction motor is typically higher when operating at:





39. The starting torque of a three-phase induction motor can be increased by:





40. The power rating of a transformer is determined primarily by its:





41. In a DC motor, the back emf is directly proportional to:





42. The stray losses in electrical machines include:





43. The leakage reactance in a transformer is due to:





44. The core of a transformer is laminated to:





45. The efficiency of a transformer is maximum when the ratio of copper loss to iron loss is:





46. The function of the gasket in electrical machines is to:





47. The torque-speed characteristics of a DC series motor are suitable for applications requiring:





48. The term “Knee Point Voltage” is associated with:





49. The inductance of a coil in an electrical machine depends on:





50. The voltage regulation of a synchronous generator is usually expressed as a percentage of the:





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