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NEET Sample Paper NEET Sample Test Paper-28

  • question_answer
    A transfarmer has 100 turns in the primary coil and carries 8A current. If input power is one kilowatts, then number of turns in the secondary coil to have 500 V output will be :-

    A)  100               

    B)  200

    C)  400            

    D)  300

    Correct Answer: C

    Solution :

    For ideal transfer \[{{P}_{in}}={{P}_{out}}=1000\,W\] \[{{P}_{out}}={{V}_{S}}{{I}_{S}}\] \[{{I}_{S}}=\frac{{{P}_{out}}}{{{V}_{S}}}=\frac{1000}{500}=2A\] \[\frac{{{I}_{P}}}{{{I}_{S}}}=\frac{{{N}_{S}}}{{{N}_{P}}}\] \[{{N}_{S}}=\left( \frac{{{I}_{P}}}{{{I}_{S}}} \right){{N}_{P}}=\left( \frac{8}{2} \right)100=400\]              


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