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EEE :: Industrial Drives

  1. The load cycle for a motor driving a power press will be

  2. A.

     Variable load

    B.

     Continuous

    C.

     Continuous but periodical

    D.

     Intermittent and variable load


  3. Which of the following motors is used for elevators?

  4. A.

     Induction motor

    B.

     Synchronous motor

    C.

     Capacitor start single phase motor

    D.

     Any of the above


  5. Ward-Leonard controlled D.C. drives are generally used for _________ excavators.

  6. A.

     Light duty

    B.

     Medium duty

    C.

     Heavy duty

    D.

     All of the above


  7. A reluctance motor

  8. A.

     Is provided with slip rings

    B.

     Requires starting gear

    C.

     Has high cost

    D.

     Is compact


  9. Which of the following motors are preferred for overhead traveling cranes?

  10. A.

     Slow speed motors

    B.

     Continuous duty motors

    C.

     Short time rated motors

    D.

     None of the above


  11. In jaw crushers a motor has to often start against ________ load.

  12. A.

     Heavy

    B.

     Medium

    C.

     Normal

    D.

     Low


  13. For which of the following applications D.C. motors are still preferred?

  14. A.

     High efficiency operation

    B.

     Reversibility

    C.

     Variable speed drive

    D.

     High starting torque


  15. Is not a part of ball bearing?

  16. A.

     Inner race

    B.

     Outer race

    C.

     Cage

    D.

     Bush


  17. The characteristics of drive for crane hoisting and lowering are which of the following?

  18. A.

     Precise control

    B.

     Smooth movement

    C.

     Fast speed control

    D.

     All of the above


  19. The starting torque of a D.C. motor is independent of which of the following?

  20. A.

     Flux

    B.

     Armature current

    C.

     Flux and armature current

    D.

     Speed