JEE Main & Advanced Sample Paper JEE Main Sample Paper-26

  • question_answer
    A step - down transformer, transforms a supply line voltage of 2200 V into 220V. The primary coil has 5000 turns. The efficiency and power transmitted by the transformer are \[90%\] and 8 kW respectively. Then, the power supplied is:

    A)  \[9.89\] kW                              

    B)  \[8.89\] kW

    C)  \[88.9\] kW                              

    D)  889 kW

    Correct Answer: B

    Solution :

    Efficiency of transformer is given by: \[\eta \,=\frac{Output\,power}{Input\,Power}\] Here, \[{{P}_{Output}}=8kW,\,\,\eta \,=90%\] \[{{P}_{input}}\,=\frac{8\times 100}{\,90}\,=\frac{80}{9}kW\,=8.89\,kW\]

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