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KVPY Sample Paper KVPY Stream-SX Model Paper-17

  • question_answer
    A power transmission line feeds input power at 2300 V to a step down transformer with its primary winding- having 4000 turns. The output power is delivered ? 230 V by the transformer. If the current in the primary of the transformer is 5 A and its efficiency is 90%, the output current would be:

    A) 50 A

    B) 45 A

    C) 35 A

    D) 25 A

    Correct Answer: B

    Solution :

    \[{{P}_{s}}=\eta {{P}_{p}}\] \[\Rightarrow \]   \[{{E}_{s}}{{i}_{s}}=\eta {{E}_{i}}{{i}_{p}}\] \[\Rightarrow \]   \[{{i}_{s}}=\frac{(0.9)(2300)(5)}{(230)}=4.5A.\]


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