question_answer

The impedance of a circuit consists of 3\[\Omega \] resistance and 4\[\Omega \] reactance. The power factor of the circuit is

A)  0.4                                        

B)  0.6

C)  0.8                                        

D)  1.0

Correct Answer: B

Solution :

                 We know that                                 \[\tan \phi =\frac{X}{R}=\frac{4}{3}\] Then, power factor       ^^                 \[=\cos \phi \]                 \[=\frac{3}{5}\] \[\Rightarrow \]               \[\cos \phi =0.6\]