Power Factor in AC Circuit

If the power factor in an AC circuit changes from (1)/(3) to (1)/(9) then by what percent reactance will change (approximately), If resistance remains constant?

If the power factor in a circuit is unity, then the impedance of the circuit is

The power factor in the circuit is unity, when the circuit contains an ideal

The power factor of an AC circuit is 0.5 . What will be the phase difference between voltage and current in this circuit ?

The power factor of an AC circuit having resistance (R) and inductance (L) connected in series and an angular velocity omega is

The power factor of LCR circuit at resonance is-

Power loss in AC circuit will be minimum when

What is the power factor of an A circuit containing inductor or capacitor ?

The minumum and maximum values of power factor in an A.C. circuit are respectively:

The power factor of a CR circuit is (1)/(sqrt(2)) . If the frequency of ac signal is halved, then the power factor of the circuit becomes