Chapter 1 D.C. MACHINES FUNDAMENTALS MCQs

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1. . The induced e.m.f. by electromagnetic induction is firstly stated by the scientist:





2. . Whenever a conductor or a coil cuts the magnetic flux, an e.m.f is induced in that conductor or coil, this is called:





3. . The relationship between the magnitude of induced e.m.f. and rate of change of flux linkage is:





4. . According to Faraday’s laws of electromagnetic induction, the induced e.m.f. is:





5. . The unit of magnetic flux is:





6. . The working principle of d.c. generator is:





7. . When a conductor cuts the stationary magnetic field by movement, then induced e.m.f is called:





8. . When magnetic field moves and cuts by stationary conductor, then induced e.m.f. is called:





9. . The induced e.m.f. in a DC generator is:





10. . The induced e.m.f. in an AC generator is:





11. . When the conductor and electromagnet are stationary but the magnetic field is changed, then induced e.m.f. is called:





12. . The induced e.m.f. in a transformer is:





13. . Self-induced e.m.f. =





14. . The induced e.m.f. by electromagnetic induction depends upon:





15. . According to Fleming’s right hand rule (& left-hand rule), the first finger points:





16. . According to Fleming’s right hand rule (& left-hand rule), the middle finger points:





17. . According to Fleming’s right hand rule (& left-hand rule), the thumb points:





18. . Fleming’s right hand rule is used for:





19. . Fleming’s left-hand rule is used for:





20. . Induced effect always opposes the cause that produced it is called:





21. . When a current carrying conductor is placed in magnetic field then a mechanical force acts in a direction of:





22. . Mechanical force on a current carrying conductor in a magnetic field is given by:





23. . If a current carrying conductor is at right angles to the magnetic field, then force ‘F’ is:





24. . If a current carrying conductor is parallel to the magnetic field, then force ‘F’ is:





25. . If a current carrying conductor is inclined to the magnetic field, then force ‘F’ is:





26. . The most important parts of d.c. machines are:





27. . It provides mechanical support to d.c. machine:





28. . The purpose of yoke in a d.c. machine:





29. . The yoke of d.c. machine is made up of:





30. . The number of field poles in a d.c. machines are:





31. . The purpose of pole shoes in a d.c. machine is to:





32. . The field poles of d.c. machine are made up of:





33. . The poles (& armature) of d.c. machine is laminated to reduce:





34. . The field coils (and armature winding) are made up of:





35. . Interpoles are also called:





36. . Interpoles are connected to armature:





37. . Interpoles are made up of:





38. . The core of armature is made up of:





39. . The armature core of d.c. machine is laminated to reduce:





40. . The thickness of armature core lamination is about:





41. . It works as a rectifier in a d.c. machine:





42. . Commutator segments are made up of:





43. . The purpose of commutator in a d.c. machine is to:





44. . The part where the armature coils are connected is called:





45. . The commutator segments should have this property:





46. . This insulation is usually used between commutator segments:





47. . To collect current from commutator and make it available to the stationary external circuit is the function of:





48. . Brushes are made up of:





49. . The thickness of insulation between commutator segments is:





50. . The shaft rotates smoothly with the use of this part:





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