A) 48%
B) 63.8%
C) 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 (V)\[\times \]Current (J) \[\therefore \] Efficiency \[=\frac{{{V}_{s}}{{I}_{s}}}{{{V}_{p}}{{I}_{p}}}\times 100\] Given, \[{{P}_{out}}={{V}_{s}}{{I}_{s}}=140\,W,\,{{P}_{in}}=240\times 0.7\] \[\therefore \]Efficiency\[=\frac{140}{240\times 0.7}\times 100=83.3%\]
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