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EEE :: Transformers

  1. Which of the following is the main advantage of an auto-transformer over a two winding transformer?

  2. A.

     Hysteresis losses are reduced

    B.

     Saving in winding material

    C.

     Copper losses are negligible

    D.

     Eddy losses are totally eliminated

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  3. Primary winding of a transformer

  4. A.

     is always a low voltage winding

    B.

     is always a high voltage winding

    C.

     could either be a low voltage or high voltage winding

    D.

     none of the above

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  5. Negative voltage regulation is indicative that the load is

  6. A.

     capacitive only

    B.

     inductive only

    C.

     inductive or resistive

    D.

     none of the above

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  7. Which motor is preferred for use in mines where explosive gases exist?

  8. A.

     Air motor

    B.

     Induction motor

    C.

     Shunt motor

    D.

     Synchronous motor

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  9. Which type of winding is used in 3phase shell-type transformer?

  10. A.

     Circular type

    B.

     Sandwich type

    C.

     Cylindrical type

    D.

     Rectangular type

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  11. The hum in a transformer is mainly attributed to

  12. A.

     load changes

    B.

     oil in the transformer

    C.

     magnetostriction

    D.

     mechanical vibrations

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  13. An ideal transformer is one which has

  14. A.

     no losses and magnetic leakage

    B.

     interleaved primary and secondary windings

    C.

     a common core for its primary and secondary windings

    D.

     core of stainless steel and winding of pure copper metal

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  15. Noise level test in a transformer is a

  16. A.

     special test

    B.

     routine test

    C.

     type test

    D.

     none of the above

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  17. The 'crawling' in an induction motor is caused by

  18. A.

     high loads

    B.

     low voltage supply

    C.

     improper design of machine

    D.

     harmonics developed in the motor

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  19. Open circuit test on transformers is conducted to determine

  20. A.

     hysteresis losses

    B.

     copper losses

    C.

     core losses

    D.

     eddy current losses

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