A) 0.01
B) 0.2
C) 0.05
D) 0.042
E) 0.6
Correct Answer: E
Solution :
Power factor \[\cos \phi =\frac{R}{\sqrt{{{R}^{2}}+{{\omega }^{2}}{{L}^{2}}}}\] \[=\frac{30}{\sqrt{{{(30)}^{2}}+{{(100)}^{2}}\times {{(400\times {{10}^{-3}})}^{2}}}}\] \[=\frac{30}{\sqrt{900+1600}}=\frac{30}{50}=0.6\]You need to login to perform this action.
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