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JAMIA MILLIA ISLAMIA Jamia Millia Islamia Solved Paper-2010

  • question_answer
        A transformer has an efficiency of 80%. It works at 4 kW and 100 V. If secondary voltage is 240 V the current in primary coil is

    A)  0.4 A                                    

    B)  4 A

    C)  10 A                                     

    D)  40 A

    Correct Answer: D

    Solution :

                    As   \[{{I}_{p}}{{E}_{p}}={{P}_{i}}\] \[\therefore \]  \[{{I}_{p}}=\frac{{{p}_{i}}}{{{E}_{p}}}=\frac{4000}{100}=40\,A\]


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