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NEET Sample Paper NEET Sample Test Paper-45

  • question_answer
    A step down transformer reduces 220 V to 110 V. The primary draws 5 ampere of current and secondary supplies 9 ampere. The efficiency of transformer is-

    A) \[20%\]             

    B) \[44%\]

    C) \[90\,%\]                       

    D) \[100\,%\]

    Correct Answer: C

    Solution :

    \[%\text{ }efficiency=\frac{{{P}_{out}}}{{{P}_{in}}}\times \,100=\,\,\frac{110\times 9}{220\times 5}\times 100=90%\]


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