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A.C. Machines MCQs -DAE Electrical Engineering

50 Score: 0 Attempted: 0/50
1. The main function of an alternator is to:




2. The frequency of the generated EMF in an alternator depends on:




3. The synchronous speed of a three-phase alternator is given by:




4. The rotor of a synchronous machine is also called:




5. The stator of an alternator carries:




6. Synchronous motors run at:




7. The power factor of a synchronous motor can be controlled by:




8. An induction motor works on the principle of:




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




10. The slip of a synchronous motor at steady state is:




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




12. A three-phase induction motor is mainly used for:




13. The starting torque of a three-phase squirrel-cage induction motor is:




14. The rotor resistance of a slip-ring induction motor can be varied to:




15. The efficiency of an induction motor is maximum at:




16. The main advantage of an induction motor is:




17. The synchronous generator is also called:




18. The excitation of a synchronous generator is provided by:




19. The power developed by an alternator depends on:




20. The voltage regulation of an alternator is defined as:




21. The EMF induced in an alternator is given by:




22. The purpose of damper windings in a synchronous machine is:




23. The no-load current of an alternator is called:




24. The main losses in an AC machine are:




25. The synchronous reactance of an alternator represents:




26. The synchronous condenser is:




27. The rotor of a synchronous motor is supplied by:




28. The main disadvantage of squirrel-cage induction motor is:




29. A shaded-pole induction motor is mainly used in:




30. The type of rotor in an induction motor determines:




31. The speed of an induction motor decreases with:




32. The synchronous speed of a 4-pole, 50 Hz induction motor is:




33. The starting current of a star-connected induction motor is:




34. The starting methods of induction motors include:




35. The speed of an induction motor depends on:




36. The hysteresis loss in AC machines occurs due to:




37. Eddy current loss in AC machines can be reduced by:




38. The efficiency of an alternator is maximum at:




39. The induced EMF in a three-phase alternator is:




40. The short-circuit ratio of an alternator affects:




41. The rating of an AC machine is given in:




42. The purpose of slip rings in a wound-rotor induction motor is:




43. The main application of synchronous motors is:




44. The rotor of a synchronous motor must be brought near synchronous speed by:




45. A 3-phase induction motor with 6 poles on 50 Hz supply has synchronous speed:




46. The mechanical power developed by a synchronous motor is proportional to:




47. In a generator, the frequency of generated EMF is proportional to:




48. The voltage induced in the stator winding depends on:




49. The slip of a normal induction motor at full load is usually:




50. The main difference between synchronous and induction motors is:




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