2. Solved Papers
  3. JAMIA MILLIA ISLAMIA

JAMIA MILLIA ISLAMIA Jamia Millia Islamia Solved Paper-2013

  • question_answer
    An electric motor operates on a 50 V supply and a current of 12 A. If the efficiency of the motor is 30%, what is the resistance of the winding of the motor?

    A)  \[6\,\Omega \]                               

    B)  \[4\,\Omega \]

    C)  \[2.9\,\Omega \]                            

    D)  \[3.2\,\Omega \]

    Correct Answer: C

    Solution :

                    We know that, \[I=\frac{E-e}{R}\] According to the question,                 \[30=\left( \frac{e}{E} \right)\times 100\]                 \[30=\frac{e}{50}\times 100\]                 \[e=15\,V\]                 \[R=\frac{50-15}{12}=2.9\,\Omega \]


You need to login to perform this action.
You will be redirected in 3 sec spinner