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  3. RAJASTHAN ­ PET

RAJASTHAN ­ PET Rajasthan PET Solved Paper-2008

  • question_answer
    The electric motor operating on a 200 volt DC supply draw a current of 10 A. If the power is 40%, then resistance of motor

    A)  20             

    B)  8 n

    C)  12 n            

    D)  16 n

    Correct Answer: C

    Solution :

     Input power \[P=Vi\] \[=200\times 10=2000\text{ }W\] Output power\[=\frac{40}{100}\times 2000\] \[=800W\] Power dissipated \[=2000-800\] \[=1200W\] \[{{i}^{2}}R=1200\] \[R=\frac{1200}{{{i}^{2}}}\] \[=\frac{1200}{10\times 10}\] or              \[R=12\,\Omega \]


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