1.

A series combination of `R,LC` is connected to an a.c source. If the resistance is `3 Omega` and the reactance is `4 Omega`, the power factor of the circuit isA. 0.4B. 0.6C. 0.8D. `1.0`

Answer» Correct Answer - B
`x = 4 Omega, R = 3 Omega`
`Z = sqrt(R^(2) + X^(2)) = sqrt(3^(2) + 4^(2)) = 5`
Power factor `= cos phi = (R )/(Z) = (3)/(5) = 0.6`


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