1.

For one series A.C. circuit, its reactance is equal to its resistance. Then its power factor is ……….

Answer»

1
`1/2`
`1/sqrt2`
0

Solution :If `phi` is the PHASE difference between voltage and current in series A.C. circuit then we have :
tan `phi=(X_L-X_C)/R=1`(`because` Here `X_L-X_C=R`)
`therefore phi=45^@=pi/4` rad
Now , POWER FACTOR `=cos phi =cos 45^@ =1/sqrt2`


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