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EEE :: Electrical Control Systems

  1. An automatic toaster is a ______ loop control system.

  2. A.

     open

    B.

     closed

    C.

     partially closed

    D.

     any of the above

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  3. Is an open loop control system.

  4. A.

     Ward Leonard control

    B.

     Field controlled D.C. motor

    C.

     Stroboscope

    D.

     Metadyne

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  5. For open control system which of the following statements is incorrect ?

  6. A.

     Less expensive

    B.

     Recalibration is not required for maintaining the required quality of the output

    C.

     Construction is simple and maintenance easy

    D.

     Errors are caused by disturbances

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  7. A.C. servomotor is basically a

  8. A.

     universal motor

    B.

     single phase induction motor

    C.

     two phase induction motor

    D.

     three phase induction motor

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  9. Regenerative feedback implies feedback with

  10. A.

     oscillations

    B.

     step input

    C.

     negative sign

    D.

     positive sign

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  11. By which of the following the system response can be tested better ?

  12. A.

     Ramp input signal

    B.

     Sinusoidal input signal

    C.

     Unit impulse input signal

    D.

     Exponentially decaying signal

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  13. Zero initial condition for a system means

  14. A.

     input reference signal is zero

    B.

     zero stored energy

    C.

     ne initial movement of moving parts

    D.

     system is at rest and no energy is stored in any of its components

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  15. In closed loop control system, with positive value of feedback gain the overall gain of the system will

  16. A.

     decrease

    B.

     increase

    C.

     be unaffected

    D.

     any of the above

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  17. Is not a final control element.

  18. A.

     Control valve

    B.

     Potentiometer

    C.

     Electropneumatic converter

    D.

     Servomotor

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  19. Signal will become zero when the feedback signal and reference signs are equal.

  20. A.

     Input

    B.

     Actuating

    C.

     Feedback

    D.

     Reference

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