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

  • question_answer
    In a transformer the transformation ratio is 0.3. If 220 VAC is fed to the primary, then the voltage across the secondary is:

    A) 44 V                

    B) 55 V   

    C) 60 V                            

    D) 66 V  

    Correct Answer: D

    Solution :

    (d) 66 V Here, Transformation ratio, k = 0.3 As,        \[K=\frac{{{N}_{S}}}{{{N}_{P}}}=\frac{{{V}_{S}}}{{{V}_{P}}}\] \[\therefore {{V}_{S}}=k{{V}_{P}}=0.3\times 220=66\,V\]


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