Short Notes: AC & DC Bridges | Short Notes for Electrical Engineering - Electrical Engineering (EE) PDF Download

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1. What is the purpose of using AC and DC bridges in electrical engineering?
Ans. AC and DC bridges are used in electrical engineering to measure unknown electrical resistances, capacitances, and inductances accurately by comparing them with known values in a balanced bridge circuit.
2. How does an AC bridge differ from a DC bridge in terms of operation?
Ans. AC bridges are used to measure unknown impedance values at high frequencies, typically in the kHz range, while DC bridges are used for measuring resistance values at low frequencies, usually in the Hz range.
3. What are the advantages of using a bridge circuit for measuring electrical parameters?
Ans. Bridge circuits offer high accuracy in measuring unknown electrical parameters, are relatively simple to set up, and provide a null indication when the bridge is balanced, indicating the unknown value is equal to the known value.
4. Can AC bridges be used to measure DC resistance values?
Ans. No, AC bridges are designed to work with alternating current signals and are not suitable for measuring DC resistance values. For measuring DC resistance, a DC bridge circuit should be used.
5. What are some common applications of AC and DC bridges in practical electrical engineering scenarios?
Ans. AC bridges are commonly used in impedance measurements in electronic circuits, while DC bridges are used for resistance measurements in applications such as strain gauge sensors and temperature sensors.
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