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Power factor may be equal to 1 for:

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Power factor may be equal to 1 for:
A. pure inductor
B. pure capacitor
C. pure resistor
D. An `LCR` circuit
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Correct Answer - C,D
`cos phi=R/z=R/sqrt(R^(2)+(X_(L)-X_(C))^(2))=1`
Because `X_(L)=X_(C)`
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