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EEE :: Single Phase Induction Motors

  1. The starting winding of a single-phase motor is placed in

  2. A.

     Armature

    B.

     Field

    C.

     Rotor

    D.

     Stator


  3. In case of high speed universal motor which of the following needs more attention ?

  4. A.

     End play

    B.

     Air gap

    C.

     Insulation in rotor

    D.

     Balancing of rotor


  5. Which of the following motors can be run on AC. as well as D.C. supply ?

  6. A.

     Universal motor

    B.

     Repulsion motor

    C.

     Synchronous motor

    D.

     Reluctance motor


  7. Which of the following applications always have some load whenever switched on ?

  8. A.

     Vacuum cleaners

    B.

     Fan motors

    C.

     Pistol drills

    D.

     All of the above


  9. The purpose of stator winding in the compensated repulsion motor is to

  10. A.

     provide mechanical balance

    B.

     improve power factor and provide better speed regulation

    C.

     prevent hunting in the motor

    D.

     eliminate armature reaction


  11. As hysteresis motors are free from mechanical and magnetic vibrations therefore these are considered as suitable for

  12. A.

     fans

    B.

     blowers

    C.

     sound equipment

    D.

     mixer grinders


  13. The speed control of universal motor used for sewing machines is by

  14. A.

     friction

    B.

     varying the resistance

    C.

     tapping the field

    D.

     centrifugal mechanism


  15. The running winding of a single phase motor on testing with Meggar is found to be ground. Most probable location of the ground will be

  16. A.

     At the end connections

    B.

     At the end terminals

    C.

     Anywhere on the winding inside a slot

    D.

     At the slot edge where coil enters or comes out of the slot


  17. Which of the following motor will give relatively high starting torque ?

  18. A.

     Capacitor start motor

    B.

     Capacitor run motor

    C.

     Split phase motor

    D.

     Shaded pole motor


  19. The range of efficiency for shaded pole motors is

  20. A.

     95% to 99%

    B.

     80% to 90%

    C.

     50% to 75%

    D.

     5% to 35%