Answer Posted / praveen jkumar sharma

unity powerfactor:when voltage and current are in same
phase i.e displaced by zero degrees simply cos(phy)=1;
where phy is the phase angle b\w voltage and current
low power factor: when current lags behind voltate by angle
phy,usally cos(phy)=0.1 to 0.4 corresponds to low power
factor

earth resistance varies from 2 to 5 ohm.

i am going to give the JSEB,RANCHI exam for power plant,so i need some samples of papers related to that,so please send me these papers by my mail id.

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