2. Solved Papers
  3. CEE Kerala Engineering

CEE Kerala Engineering CEE Kerala Engineering Solved Paper-2005

  • 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

    E)  24 A

    Correct Answer: A

    Solution :

    \[\frac{80}{100}=\frac{120\times 20}{1000\times {{I}_{p}}}\] \[{{I}_{P}}=\frac{120\times 20}{1000\times 0.28}=3A\]


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