Transformers

Transformers MCQs with answers PDF for Electrical Engineering test preparation. Includes Transformers MCQs online test, and Transformers questions and answers PDF download. Electrical Engineering MCQs for PPSC, FPSC, NTS, KPPSC, ETEA, SPSC, BPSC, AJKPSC, MES, Railways, WAPDA.

  • What is Transformer ?

    A. Transformer is a device used to convert low alternating current to a high alternating current
    B. Transformer is a device used to convert low alternating voltage to a high alternating voltage
    C. Transformer is a device used to convert alternating current to direct current
    D. None of them

  • What is a transformer’s basic operating principle ?

    A. Transformer works on the principle of ampere law
    B. Transformer works on the principle of coulomb law
    C. Transformer works on the principle of mutual induction
    D. Transformer works on the principle of self induction

  • In comparison to Kraft paper, what is the best material for transformer insulation ?

    A. Cotton
    B. Low grade pressboard
    C. Oil
    D. Asbestos

  • The ideal transformer will operate at its highest efficiency at a load when:

    A. copper loss = iron loss
    B. copper loss < iron loss
    C.  copper loss > iron loss
    D. cannot be determined

  • What is the function of a breather in a transformer ?

    A.  To provide oxygen inside the tank
    B. To cool the coils during reduced load
    C. To cool the transformer oil
    D. To arrest flow of moisture when outside air enters the transformer

  • On which of the following transformers can Buchholz’s relay be fixed ?

    A. Auto-transformers
    B.  Air-cooled transformers
    C.  Oil cooled transformers
    D. Welding transformers

  • A transformer’s primary winding:

    A. Cannot be determined
    B. Is always a low voltage winding
    C.  Is always a high voltage winding
    D. Could either be a low voltage or high voltage winding

  • What type of flux is required for transformer action ?

    A. Increasing magnetic flux
    B. Constant magnetic flux
    C. Alternating magnetic flux
    D.  Alternating electric flux

  • No-load current in the transformer is:

    A. Steps
    B. Straight DC
    C. Sinusoidal
    D. Sinusoidal distorted

  • Transformer voltage control is provided by:

    A. E2-V2/V2
    B.  E2-V2/E2
    C. V2-E2/E2
    D. V2-E2/V2