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EEE :: D.C. Generators

  1. For a D.C. generator when the number of poles and the number of armature conductors is fixed, then which winding will give the higher e.m.f.?

  2. A.

     Lap winding

    B.

     Wave winding

    C.

     Either of (A) and (B) above

    D.

     Depends on other features of design

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  3. In any rotating machine that part which houses the conductors and in which e.m.f. induced is to be utilised is called

  4. A.

     rotor

    B.

     stator

    C.

     field

    D.

     armature

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  5. In any rotating machine that part which houses the conductors and in which e.m.f. induced is to be utilized is called

  6. A.

     Rotor

    B.

     Stator

    C.

     Field

    D.

     Armature

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  7. The resistance of armature winding depends on

  8. A.

     Length of conductor

    B.

     Cross-sectional area of the conductor

    C.

     Number of conductors

    D.

     All of the above

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  9. A D.C. welding generator has

  10. A.

     Lap winding

    B.

     Wave moving

    C.

     Duplex winding

    D.

     Any of the above

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  11. Iron losses in a D.C. machine are independent of variations in

  12. A.

     Speed

    B.

     Load

    C.

     Voltage

    D.

     Speed and voltage

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  13. In a shunt generator the voltage build up is generally restricted by

  14. A.

     speed limitation

    B.

     armature heating

    C.

     insulation restrictions

    D.

     saturation of iron

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  15. The series field of a short-shunt D.C. generator is excited by

  16. A.

     external current

    B.

     armature current

    C.

     shunt current

    D.

     load current

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  17. D.C. series generator is used

  18. A.

     To supply traction load

    B.

     To supply industrial load at constant voltage

    C.

     Voltage at the toad end of the feeder

    D.

     For none of the above purpose

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  19. Which of the following D.C. generators will be in a position to build up without any residual magnetism in the poles ?

  20. A.

     Series generator

    B.

     Shunt generator

    C.

     Compound generator

    D.

     None of the above

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