A) \[48%\]
B) \[63.8%\]
C) \[83.3%~\]
D) \[90%\]
Correct Answer: C
Solution :
The amplitude of the voltage induced in the secondary is dependent upon the efficiency of the transformer and the turns ratio. Efficiency \[=\frac{{{P}_{out}}}{{{P}_{in}}}\times 100\] Also, \[Power\,(P)=Voltage\text{ (V) }\times \text{ }Current\text{ (J)}\] \[\therefore \] Efficiency \[=\frac{{{V}_{S}}{{I}_{S}}}{{{V}_{P}}{{I}_{P}}}\times 100\] Given, \[{{P}_{out}}={{V}_{S}}{{I}_{S}}=140W,\,\,{{P}_{m}}=240\times 0.7\] \[\therefore \] Efficiency \[=\frac{140}{240\times 0.7}\times 100=83.3%\]
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