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Railways RRB (Assistant Loco Pilot & Technician) Solved Paper-2 (2013)

  • question_answer
    A 100% efficient transformer has 100 turns in the primary and 25 turns in its secondary coil. If the current in the secondary coil is 4 A, then the current in the primary coil is

    A)  16 A                    

    B)  8 A

    C)  4 A                     

    D)  1 A

    Correct Answer: D

    Solution :

    In transformer, \[\frac{{{N}_{1}}}{{{N}_{2}}}=\frac{{{l}_{2}}}{{{l}_{1}}}\] if there are no losses \[\frac{100}{25}=\frac{4}{{{l}_{1}}}\] \[\Rightarrow \] \[{{l}_{1}}=\frac{25\times 4}{100}=\frac{100}{100}=1\,A\]


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