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EEE :: Transformers

Transformers - General Questions
Transformers - General Questions 1
Transformers - True or False
  1. Hysteresis loss in a transformer varies as (Bmax = maximum flux density)

    2. A.

     Bmax
    B.

     Bmax1-6
    C.

     Bmax1-83
    D.

     B max

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  2. The no load current in a transformer lags behind the applied voltage by an angle of about

    3. A.

     180°
    B.

     120°
    C.

     90°
    D.

     75°

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  3. The efficiency of two identical transformers under load conditions can be determined by

    4. A.

     short-circuit test
    B.

     back-to-back test
    C.

     open circuit test
    D.

     any of the above

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  4. For a transformer, operating at constant load current, maximum efficiency will occur at

    5. A.

     0.8 leading power factor
    B.

     0.8 lagging power factor
    C.

     zero power factor
    D.

     unity power factor

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  5. Helical coils can be used on

    6. A.

     low voltage side of high kVA transformers
    B.

     high frequency transformers
    C.

     high voltage side of small capacity transformers
    D.

     high voltage side of high kVA rating transformers

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  6. Greater the secondary leakage flux

    7. A.

     less will be the secondary induced e.m.f.
    B.

     less will be the primary induced e.m.f.
    C.

     less will be the primary terminal voltage
    D.

     none of the above

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  7. A transformer core is laminated to

    8. A.

     reduce hysteresis loss
    B.

     reduce eddy current losses
    C.

     reduce copper losses
    D.

     reduce all above losses

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  8. In the transformer following winding has got more cross-sectional area

    9. A.

     Low voltage winding
    B.

     High voltage winding
    C.

     Primary winding
    D.

     Secondary winding

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  9. The transformer laminations are insulated from each other by

    10. A.

     mica strip
    B.

     thin coat of varnish
    C.

     paper
    D.

     any of the above

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  10. Buchholz's relay gives warning and protection against

    11. A.

     electrical fault inside the transformer itself
    B.

     electrical fault outside the transformer in outgoing feeder
    C.

     for both outside and inside faults
    D.

     none of the above

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