Advanced Electrical Machines MCQs

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1. Which of the following machines operates on the principle of electromagnetic induction?





2. The armature current in a DC motor is maximum when:





3. Slip in an induction motor is defined as:





4. In a synchronous machine, hunting refers to:





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





6. The main advantage of a switched reluctance motor is:





7. The back emf in a DC motor:





8. The speed of a three-phase induction motor can be controlled by:





9. The power factor of an induction motor under no-load conditions is typically:





10. The term ‘cogging’ in a permanent magnet synchronous motor refers to:





11. Which type of rotor is used in a squirrel cage induction motor?





12. The efficiency of a transformer is maximum when:





13. In a synchronous generator, the armature reaction affects:





14. The inrush current in a transformer is higher than normal operating current because of:





15. Which motor has the highest power factor at full load?





16. The speed-torque characteristic of a DC series motor is:





17. The slip rings in an induction motor are used for:





18. The efficiency of a transformer is approximately:





19. The armature reaction in a DC motor affects:





20. The starting torque of a synchronous motor is:





21. A universal motor operates on:





22. The direction of rotation of a split-phase induction motor can be reversed by:





23. The function of a commutator in a DC machine is to:





24. The power factor of a synchronous motor can be adjusted by varying the:





25. The starting current of a squirrel cage induction motor is typically:





26. The direction of rotation of a three-phase induction motor can be reversed by:





27. The armature winding in a DC machine is:





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





29. Which of the following losses occur in a transformer?





30. The efficiency of a DC generator is maximum when:





31. The emf induced in the armature of a DC generator depends on:





32. Which motor does not require a starting mechanism?





33. The speed of a synchronous motor is:





34. The no-load current in a transformer is mainly due to:





35. Which motor has the highest starting torque?





36. The torque in an induction motor is maximum when:





37. The power factor of a capacitor-run induction motor is:





38. In a wound rotor induction motor, external resistances are used to:





39. The function of laminations in the core of a transformer is to reduce:





40. The armature reaction in a synchronous machine affects:





41. The speed of a DC series motor decreases with increasing:





42. A transformer with a primary winding connected to a sinusoidal AC supply will induce:





43. The slip rings in a wound rotor induction motor are used to connect:





44. The eddy current loss in a transformer core depends on:





45. The power factor of a synchronous generator is typically:





46. The starting torque of a shaded-pole induction motor is:





47. The torque developed in an induction motor is proportional to:





48. The regulation of an alternator is defined as:





49. The power factor of an induction motor decreases with:





50. The torque-speed characteristic of a universal motor is similar to that of a:





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