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EEE :: Industrial Drives

  1. Which of the following motors is preferred for boom hoist of a traveling crane?

  2. A.

     Single phase motor

    B.

     Synchronous motor

    C.

     A.C. slip ring motor

    D.

     Ward-Leonard controlled D.C. shunt motor

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  3. The traveling speed of cranes varies from

  4. A.

     20 to 30 m/s

    B.

     10 to 15 m/s

    C.

     5 to 10 m/s

    D.

     1 to 2.5 m/s

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  5. Flame proof motors are used in

  6. A.

     Paper mills

    B.

     Steel mills

    C.

     Moist atmospheres

    D.

     Explosive atmospheres

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  7. Which of the following machines has heavy fluctuation of load?

  8. A.

     Printing machine

    B.

     Punching machine

    C.

     Planer

    D.

     Lathe

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  9. In series motor which of the following methods can be used for changing the flux per pole?

  10. A.

     Tapped field control

    B.

     Diverter field control

    C.

     Series-parallel control

    D.

     Any of the above

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  11. Has relatively wider range of speed control.

  12. A.

     Synchronous motor

    B.

     Ship ring induction motor

    C.

     Squirrel cage induction motor

    D.

     D.C. shunt motor

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  13. ________ has least range of speed control.

  14. A.

     Slip ring induction motor

    B.

     Synchronous motor

    C.

     D.C. shunt motor

    D.

     Schrage motor

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  15. In which of the following applications the load on motor changes in cyclic order?

  16. A.

     Electric shovels

    B.

     Cranes

    C.

     Rolling mills

    D.

     All of the above

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  17. For which of the following applications motor has to start with high acceleration?

  18. A.

     Oil expeller

    B.

     Floor mill

    C.

     Lifts and hoists

    D.

     Centrifugal pump

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  19. A pony motor is used for the starting which of the following motors?

  20. A.

     Squirrel cage induction motor

    B.

     Schrage motor

    C.

     Synchronous motor

    D.

     None of the above

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