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EEE :: Industrial Drivers

  1. Rotor of a motor is usually supported on _________ bearings.

  2. A.

     Ball or roller

    B.

     Needle

    C.

     Bush

    D.

     Thrust


  3. When the load is above _________ a synchronous motor is found to be more economical.

  4. A.

     2 kW

    B.

     20 kW

    C.

     50 kW

    D.

     100 kW


  5. For derris and winches which of the following drives can be used?

  6. A.

     Pole changing squirrel cage motors

    B.

     D.C. motors with Ward-Leonard control

    C.

     A.C. slip ring motors with variable resistance

    D.

     Any of the above


  7. Which of the following motors is preferred for traction work?

  8. A.

     Universal motor

    B.

     D.C. series motor

    C.

     Synchronous motor

    D.

     Three-phase induction motor


  9. Belted slip ring induction motor is almost invariably used for

  10. A.

     Water pumps

    B.

     Jaw crushers

    C.

     Centrifugal blowers

    D.

     None of the above


  11. Which feature, while selecting a motor for centrifugal pump, will be of least significance?

  12. A.

     Starting characteristics

    B.

     Operating speed

    C.

     Horse power

    D.

     Speed control


  13. While selecting an electric motor for a floor mill, which electrical characteristics will be of least significance?

  14. A.

     Running characteristics

    B.

     Starting characteristics

    C.

     Efficiency

    D.

     Braking


  15. Which of the following motors is preferred when quick speed reversal is the main consideration?

  16. A.

     Squirrel cage induction motor

    B.

     Wound rotor induction motor

    C.

     Synchronous motor

    D.

     D.C. motor


  17. For blowers which of the following motor is preferred?

  18. A.

     D.C. series motor

    B.

     D.C. shunt motor

    C.

     Squirrel cage induction motor

    D.

     Wound rotor induction motor


  19. ________ need frequent starting and stopping of electric motors,

  20. A.

     Paper mills

    B.

     Grinding mills

    C.

     Air-conditioners

    D.

     Lifts and hoists