Menu
Home / EEE / D.C. Generators :: section-1

EEE :: D.C. Generators

D.C. Generators - section-1
  1. A series generator can self-excite

    2. A.

     Only if the load current is zero
    B.

     Only if the load current is not zero
    C.

     Irrespective of the value of load current
    D.

     None of the above

    View Answer

    Workspace

    Discuss Discuss in Forum

  2. The armature of D.C. generator is laminated to

    3. A.

     reduce the bulk
    B.

     provide the bulk
    C.

     insulate the core
    D.

     reduce eddy current loss

    View Answer

    Workspace

    Discuss Discuss in Forum

  3. The material for commutator brushes is generally

    4. A.

     Mica
    B.

     Copper
    C.

     Cast iron
    D.

     Carbon

    View Answer

    Workspace

    Discuss Discuss in Forum

  4. Armature coil is short circuited by brushes when it lies

    5. A.

     Along neutral axis
    B.

     Along field axis
    C.

     In any of the above positions
    D.

     In none of the above positions

    View Answer

    Workspace

    Discuss Discuss in Forum

  5. Satisfactory commutation of D.C. machines requires

    6. A.

     Brushes should be of proper grade and size
    B.

     Brushes should smoothly run in the holders
    C.

     Smooth, concentric commutator properly undercut
    D.

     All of the above

    View Answer

    Workspace

    Discuss Discuss in Forum

  6. A D.C. generator can be considered as

    7. A.

     Rectifier
    B.

     Prime mover
    C.

     Rotating amplifier
    D.

     Power pump

    View Answer

    Workspace

    Discuss Discuss in Forum

  7. In case of a flat compounded generator

    8. A.

     Voltage generated is less than the rated voltage
    B.

     Generated voltage is proportional to the load on the generator
    C.

     Voltage remains constant irrespective of the load
    D.

     Speed varies in proportion to the load on the generator

    View Answer

    Workspace

    Discuss Discuss in Forum

  8. The e.m.f. generated in a D.C. generator is directly proportional to

    9. A.

     Flux/pole
    B.

     Speed of armature
    C.

     Number of poles
    D.

     All of the above

    View Answer

    Workspace

    Discuss Discuss in Forum

  9. A 220 V D.C. generator is run at full speed without any excitation. The open circuit voltage will be

    10. A.

     Zero
    B.

     About 2 V
    C.

     About 50 V
    D.

     220 V

    View Answer

    Workspace

    Discuss Discuss in Forum

  10. If B is the flux density, I the length of conductor and v the velocity of conductor, then induced e.m.f. is given by

    11. A.

     Blv
    B.

     Blv²
    C.

     Bl²v
    D.

     Bl²v²

    View Answer

    Workspace

    Discuss Discuss in Forum

Java Programming Questions and Answers Interview Questions and Answers