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EEE :: Industrial Drives

  1. Which of the following motors has series characteristics?

  2. A.

     Shaded pole motor

    B.

     Repulsion motor

    C.

     Capacitor start motor

    D.

     None of the above


  3. Which part of a motor needs maximum attention for maintenance?

  4. A.

     Frame

    B.

     Rearing

    C.

     Stator winding

    D.

     Rotor winding


  5. A wound rotor induction motor is preferred, as compared to squirrel cage induction motor, when major consideration is

  6. A.

     Slop speed operation

    B.

     High starting torque

    C.

     Low windage losses

    D.

     All of the above


  7. ________ has the least value of starting torque to full load torque ratio.

  8. A.

     D.C. shunt motor

    B.

     D.C. series motor

    C.

     Squirrel cage induction motor

    D.

     Slip ring induction motor


  9. The starting torque in case of centrifugal pumps is generally

  10. A.

     Less than running torque

    B.

     Same as running torque

    C.

     Slightly more than running torque

    D.

     Double the running torque


  11. For a D.C. shunt motor which of the following is incorrect?

  12. A.

     Unsuitable for heavy duty starting

    B.

     Torque varies as armature current

    C.

     Torque armature current is a straight line

    D.

     Torque is zero for zero armature current


  13. Which of the following happens when star-delta starter is used?

  14. A.

     Starting voltage is reduced

    B.

     Starting current is reduced

    C.

     Both (A) and (B)

    D.

     None of the above


  15. __________ method of starting a three phase induction motor needs six terminals.

  16. A.

     Star-delta

    B.

     Resistance starting

    C.

     Autotransformer

    D.

     None of the above


  17. In a paper mill where constant speed is required

  18. A.

     Synchronous motors are preferred

    B.

     A.C. motors are preferred

    C.

     Individual drive is preferred

    D.

     Group drive is preferred


  19. Is preferred for synthetic fibre mills.

  20. A.

     Synchronous motor

    B.

     Reluctance motor

    C.

     Series motor

    D.

     Shunt motor