Question

Hay’s Bridge is used for measuring __________

(a) Resistance in the milliohm range

(b) Low values of capacitance

(c) Comparison of resistances which are nearly equal

(d) The Inductance of a coil with a large time constant

I got this question in an interview.

The origin of the question is Advanced Problems on Measurement of Inductance using AC Bridges in portion Measurement of Inductance and Capacitance of Electrical Measurements

Answer 1

Right choice is (d) The Inductance of a coil with a large time constant

The explanation is: Carey – Foster slide-wire is suited for the comparison of resistances which are nearly equal. The Schering Bridge is suited for Low values of capacitance. The Kelvin double bridge is used for measuring resistance in the milliohm range. Hay’s Bridge is suited for the measurement of Inductance of a coil with a large time constant.