Question

Which of the following bridge is not used for the measurement of capacitance?

• A. Schering bridge
• B. Wien's bridge
• C. De Sauty's bridge
• D. Hay's bridge

Hint:

Remember this quick mapping rule: Hay's and Maxwell's bridges are always used for Inductance (\(L\)), while De Sauty's and Schering bridges are always used for Capacitance (\(C\)).

Answer 1

The Correct Option is D

Concept: AC measurement bridges are specialized circuit configurations used to determine unknown electrical parameters like impedance, inductance, capacitance, or frequency. They are categorized based on their specific measurement applications:
• Capacitance Bridges: De Sauty’s bridge, Schering bridge, Wien's bridge (can measure capacitance/frequency).
• Inductance Bridges: Maxwell’s bridge, Hay’s bridge, Anderson’s bridge, Owen’s bridge.

Step 1: Examine the typical applications for each option.
• Schering Bridge: Widely used to measure unknown capacitance, dissipation factor, and dielectric loss properties.
• Wien's Bridge: Used for measuring frequency and capacitance.
• De Sauty's Bridge: The simplest clean bridge model used exclusively for comparing pure capacitances.
• Hay's Bridge: Specifically designed for measuring high-Q inductors (where the quality factor \(Q > 10\)).

Step 2: Identify the non-matching bridge network. Because Hay's bridge is exclusively used to measure self-inductance rather than capacitance, it is the correct answer to this negative-selection question. Thus, the correct choice is option (D).