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JEE Main & Advanced Physics Electro Magnetic Induction Question Bank Application of EMI (Motor, Dynamo, Transformer)

  • question_answer
    A transformer is employed to reduce 220 V to 11 V. The primary draws a current of 5 A and the secondary 90 A. The efficiency of the transformer is                                                                 [MP PMT 1992, 2001, 04]

    A)            20%                                          

    B)             40%

    C)            70%                                          

    D)             90%

    Correct Answer: D

    Solution :

               \[\eta =\frac{{{V}_{s}}{{i}_{s}}}{{{V}_{p}}{{i}_{p}}}\times 100=\frac{11\times 90}{220\times 5}\times 100=90\ %\]


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