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  3. WB JEE Medical

WB JEE Medical WB JEE Medical Solved Paper-2007

  • question_answer
    A step-down transformer is used on a 1000 V line to deliver 20 A at 120 V at the secondary coil. If the efficiency of the transformer is  80%, the current drawn from the line is

    A)  3 A        

    B)  \[30\,A\]

    C)  \[0.3\,A\]                          

    D)  \[2.4\,A\]

    Correct Answer: A

    Solution :

                     \[\frac{80}{100}=\frac{120\times 20}{1000\times {{I}_{p}}}\] \[{{I}_{p}}=\frac{120\times 20}{1000\times 0.8}=3A\]


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