21.In a Schering bridge the potential of the detector above earth potential is

22.The two pressure coils of a single phase power factor meter have

23.The stator of phase shifting transformer for use in conjunction with an A.C. potentiometer usually has a

24.If the current in a capacitor leads the voltage by 80�, the loss angle of the capacitor is

25.In an Anderson bridge, the unknown inductance is measured in terms of