Multiple Choice Questions on Transformer 18

  1. In operating a 400 Hz transformer at 50 Hz

    Under construction.

  2. A transformer is to be tested at full-load conditions consuming only losses from the mains

    Under construction.

  3. Laminated insulations coated with varnish are normally used in the transformer

    Under construction.

  4. If a load on secondary side of a transformer increases, the current on the primary side

    Under construction.

  5. The required thickness of lamination in a transformer decreases when

    Under construction.

  6. The short circuit test of a transformer gives the information of

    Under construction.

  7. A transformer 2,000 kVA, 250 Hz is operated at 50 Hz. Its kVA rating should be revised to

    Under construction.

  8. The windings of a transformer are divided into several coils because

    Under construction.

  9. Magnetizing impedance of a transformer is determined by

    Under construction.

  10. Routine efficiency of a transformer depends upon the value of

    Under construction.

  11. In transformer, a ferrite core has less eddy current loss than an iron core because ferrites have

    Under construction.

  12. The no-load current in a transformer lags the applied voltage by how much degree

    Under construction.

  13. The value of flux in the emf equation of a transformer

    Under construction.

  14. Transformer humming sound is reduced by the

    Under construction.

  15. During parallel operation of transformers incorrect polarity will result in

    Under construction.

  16. Small transformers below 25kVA can be easily cooled by

    Under construction.

  17. In air forced cooling, the fans are

    Under construction.

  18. The oil used in transformer cooling system is:

    Under construction.

  19. Which of the following plays an important role in transformer cooling

    Under construction.

  20. Autotransformer used to have how many winding or coil?

    Under construction.