A) \[150V,1.5A\]
B) \[300V,0.5A\]
C) \[300V,1.5A\]
D) \[150V,0.5\text{ }A\]
Correct Answer: B
Solution :
: Here, \[\frac{{{N}_{s}}}{{{N}_{p}}}=3,\eta =0.75,{{I}_{p}}=2A,{{V}_{p}}=100V\] For a transformer \[\frac{{{N}_{s}}}{{{N}_{p}}}=\frac{{{V}_{s}}}{{{V}_{p}}}\] \[\therefore \] \[{{V}_{s}}=\frac{{{N}_{s}}}{{{N}_{p}}}{{V}_{p}}=3\times 100V=300V\] Efficiency of a transformer, \[\eta =\frac{Output\,power}{Input\,power}=\frac{{{V}_{s}}{{I}_{s}}}{{{V}_{p}}{{I}_{p}}}\] \[0.75=\frac{(300V)({{I}_{s}})}{(100V)\,(2A)}\] \[{{I}_{s}}=\frac{1.5}{3}A=0.5A\]
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