schering bridge viva questions and answers

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The Schering Bridge is an electrical circuit used to measure the insulating properties of cables and electrical equipment. It is an AC bridge circuit, developed by Harald Schering. It has the advantage that the balance equation is independent of the frequency. 

The Schering bridge connections under equilibrium conditions are shown in the following figure.

In this diagram:

• C1 = capacitor whose capacity must be determined,

• R1 = a series resistor representing the loss in the capacitor C1,

• C2 = a standard capacitor,

• R3 = non-inductive resistance,

• C4 = a variable capacitor,

• R4 = a non-inductive variable resistor in parallel with the variable capacitor C4.