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EEE :: Transformers

Transformers - General Questions
Transformers - General Questions 1
Transformers - True or False
  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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  2. Primary winding of a transformer

    3. 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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  3. Negative voltage regulation is indicative that the load is

    4. A.

     capacitive only
    B.

     inductive only
    C.

     inductive or resistive
    D.

     none of the above

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

    5. A.

     Air motor
    B.

     Induction motor
    C.

     Shunt motor
    D.

     Synchronous motor

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

    6. A.

     Circular type
    B.

     Sandwich type
    C.

     Cylindrical type
    D.

     Rectangular type

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  6. The hum in a transformer is mainly attributed to

    7. A.

     load changes
    B.

     oil in the transformer
    C.

     magnetostriction
    D.

     mechanical vibrations

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  7. An ideal transformer is one which has

    8. 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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  8. Noise level test in a transformer is a

    9. A.

     special test
    B.

     routine test
    C.

     type test
    D.

     none of the above

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

    10. A.

     high loads
    B.

     low voltage supply
    C.

     improper design of machine
    D.

     harmonics developed in the motor

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  10. Open circuit test on transformers is conducted to determine

    11. A.

     hysteresis losses
    B.

     copper losses
    C.

     core losses
    D.

     eddy current losses

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