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Industrial Drives - section-1
Industrial Drives - section- 2
  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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  2. The traveling speed of cranes varies from

    3. 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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  3. Flame proof motors are used in

    4. A.

     Paper mills
    B.

     Steel mills
    C.

     Moist atmospheres
    D.

     Explosive atmospheres

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

    5. A.

     Printing machine
    B.

     Punching machine
    C.

     Planer
    D.

     Lathe

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

    6. A.

     Tapped field control
    B.

     Diverter field control
    C.

     Series-parallel control
    D.

     Any of the above

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  6. Has relatively wider range of speed control.

    7. A.

     Synchronous motor
    B.

     Ship ring induction motor
    C.

     Squirrel cage induction motor
    D.

     D.C. shunt motor

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  7. ________ has least range of speed control.

    8. A.

     Slip ring induction motor
    B.

     Synchronous motor
    C.

     D.C. shunt motor
    D.

     Schrage motor

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

    9. A.

     Electric shovels
    B.

     Cranes
    C.

     Rolling mills
    D.

     All of the above

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

    10. A.

     Oil expeller
    B.

     Floor mill
    C.

     Lifts and hoists
    D.

     Centrifugal pump

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

    11. A.

     Squirrel cage induction motor
    B.

     Schrage motor
    C.

     Synchronous motor
    D.

     None of the above

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