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EEE :: D.C. Generators

  1. Equalizer rings are required in case armature is

  2. A.

     Wave wound

    B.

     Lap wound

    C.

     Delta wound

    D.

     Duplex wound

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  3. According to Fleming's right-hand rule for finding the direction of induced e.m.f., when middle finger points in the direction of induced e.m.f., forefinger will point in the direction of

  4. A.

     Motion of conductor

    B.

     Lines of force

    C.

     Either of the above

    D.

     None of the above

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  5. Following energized winding of a D.C. machine should not be opened as it would produce high inductive voltage which may be dangerous to personnel and may cause its own insulation failure.

  6. A.

     Series field

    B.

     Compensating field

    C.

     Inter pole field

    D.

     Shunt field

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  7. The essential condition for parallel operation of two D.C. generators is that they have

  8. A.

     same kW rating

    B.

     the same operation r.p.m.

    C.

     the same drooping voltage characteristics

    D.

     same percentage regulation

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  9. A D.C. generator works on the principle of

  10. A.

     Lenz's law

    B.

     Ohm's law

    C.

     Faraday's law of electromagnetic induction

    D.

     None of the above

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  11. In a D.C. generator in case the resistance of the field winding is increased, then output voltage will

  12. A.

     Increase

    B.

     Decrease

    C.

     Remain unaffected

    D.

     Fluctuate heavily

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  13. In case of D.C. machines, mechanical losses are primary function of

  14. A.

     Current

    B.

     Voltage

    C.

     Speed

    D.

     None of above

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  15. Which of the following generator will have negligible terminal voltage while running on no-load?

  16. A.

     Series generator

    B.

     Shunt generator

    C.

     Compound generator

    D.

     Separately excited generator

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  17. To achieve sparkless commutation brushes of a D.C. generator are rockedm ahead so as to bring them

  18. A.

     just ahead of magnetic neutral axis

    B.

     in magnetic neutral axis

    C.

     just behind the magnetic neutral axis

    D.

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  19. In over compounded generator, full load terminal voltage is

  20. A.

     Almost zero

    B.

     Less than no load terminal voltage

    C.

     More than no load terminal voltage

    D.

     Equal to no-load terminal voltage

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