Electrical Machines MCQs

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1. What is the function of commutator in a DC machine?





2. In a synchronous machine, hunting can be minimized by:





3. The slip rings in an induction motor are used to:





4. In a DC machine, armature reaction results in:





5. The slip of an induction motor is defined as:





6. The voltage induced in the rotor of an induction motor is:





7. In a transformer, the function of the core is to:





8. A single-phase induction motor is inherently:





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





10. A universal motor can run on:





11. A reluctance motor operates based on:





12. In a synchronous motor, pulling into synchronism means:





13. A stepper motor is typically used for:





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





15. Slip power in an induction motor is converted into:





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





17. The efficiency of an electric motor is given by:





18. A capacitor-start induction-run motor is suitable for applications requiring:





19. The power factor of an induction motor is improved by:





20. Which motor is preferred for elevators and cranes due to its high starting torque?





21. The rotor of a squirrel-cage induction motor is made of:





22. The slip speed in an induction motor is highest when:





23. The power developed by a DC motor is proportional to:





24. A single-phase induction motor has which type of starting mechanism?





25. Which motor has the highest starting torque?





26. The torque developed in a DC motor is maximum when:





27. The back emf in a DC motor depends on:





28. A hysteresis motor operates based on:





29. The armature windings of a DC machine are usually made of:





30. Which motor is not self-starting?





31. The slip in an induction motor is necessary for:





32. The speed of a three-phase induction motor is:





33. The starting torque of a synchronous motor is:





34. The efficiency of a transformer is maximum when:





35. The rotor of a wound-rotor induction motor is connected to external resistance for:





36. The slip ring of a DC machine is made of:





37. The commutation process in a DC machine is necessary to:





38. The transformer core is laminated to:





39. The speed of a DC series motor decreases with an increase in:





40. A single-phase induction motor operates on:





41. The torque developed in an induction motor is maximum when:





42. In a three-phase induction motor, the direction of rotation can be reversed by:





43. A capacitor-start capacitor-run motor has:





44. The speed regulation of a DC shunt motor is:





45. The starting torque of a synchronous motor is __________ compared to an induction motor.





46. A split-phase motor is mainly used in applications requiring:





47. The back emf in a DC motor increases with:





48. Which type of motor has the highest starting current?





49. In a DC motor, the armature reaction causes:





50. A hysteresis motor is preferred for applications requiring:





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