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12th Class Physics Alternating Current / प्रत्यावर्ती धारा Question Bank MCQs - Alternating Current

  • question_answer
    An alternating current generator has an internal resistance \[{{R}_{g}}\] and an internal reactance \[{{\operatorname{X}}_{g}}\]. It is used to supply power to a passive load consisting of a resistance \[{{R}_{g}}\], and a reactance \[{{\operatorname{X}}_{\operatorname{L}}}\]. For maximum power to be delivered from the generator to the load, the value of \[{{\operatorname{X}}_{\operatorname{L}}}\] is equal to

    A) zero

    B) \[{{\operatorname{X}}_{g}}\]

    C) -\[{{\operatorname{X}}_{g}}\]

    D) \[{{R}_{g}}\]

    Correct Answer: C

    Solution :

    Option [c] is correct Explanation: As internal resistance of generator is already equal to external resistance Rg. So to deliver maximum power, i.e., to make reactance equal to zero, the reactance in external circuit will be - \[{{\operatorname{X}}_{g}}\]. In order to deliver maximum power, the generator to the load, the total reactance must be equal to zero, i.e., \[{{\operatorname{X}}_{\operatorname{L}}}\]+\[{{\operatorname{X}}_{g}}\]=0, \[{{\operatorname{X}}_{\operatorname{L}}}\]= -\[{{\operatorname{X}}_{g}}\].


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