A) \[\frac{{{10}^{4}}}{25\,{{(8)}^{2}}}\]
B) \[\frac{{{10}^{4}}}{25\,(8)}\]
C) \[\frac{{{(10)}^{4}}8}{25\,}\]
D) \[\frac{{{(10)}^{4}}\,{{(8)}^{2}}}{25\,}\]
Correct Answer: C
Solution :
[c] \[\eta =\frac{powe{{r}_{\,(output)}}}{powe{{r}_{input}}}=\frac{{{V}_{s}}{{I}_{s}}}{{{V}_{p}}{{I}_{p}}}\] \[\frac{{{I}_{s}}}{{{I}_{p}}}=\frac{{{V}_{p}}}{{{V}_{s}}}=\frac{{{n}_{p}}}{{{n}_{s}}}=\frac{8}{1}\] \[\frac{25}{{{I}_{p}}}=\frac{8}{1}\] \[{{I}_{p}}=\frac{25}{8}A\] \[{{P}_{input}}=10KW={{V}_{p}}{{T}_{p}}\] \[10\times {{10}^{3}}={{V}_{p}}\times \frac{25}{8}\] \[{{V}_{p}}\times \frac{8\times {{10}^{4}}}{25}\,volt\]
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