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  3. RAJASTHAN ­ PET

RAJASTHAN ­ PET Rajasthan PET Solved Paper-2004

  • question_answer
    The emf and current in an AC circuit are given by \[E=200\text{ }sin\text{ }314t\]volt and \[I=\,100\,\sin \,\left( 314+\frac{\pi }{3} \right)A,\] the coefficient of power will be

    A)  1/2              

    B)  1/4

    C)  1                

    D)  \[-1\]

    Correct Answer: A

    Solution :

     Here,     \[\phi =\frac{\pi }{3}\] \[\cos \phi =\cos \frac{\pi }{3}\] \[=\frac{1}{2}\]


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