Q2 (a) Describe the function of Wheatstone Bridge. (b) Distinguish the advantages of Kelvin Bridge over Wheatstone Bridge. (c) Discuss the differences between Maxwell Bridge and Wein Bridge.
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It consists of four resistors arranged in a diamond shape, with a voltage source connected across one diagonal and a galvanometer connected across the other diagonal. By adjusting the known resistance, the bridge can be balanced, indicating that the unknown Show more…
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(a) A Schering bridge is applied to measure the capacitance and loss angle of a H.V bushing. At balance, the observations were: the value of the standard condenser = 100 pF, R3 = 3180 ohm, C3 = 0.00125 microF, and R4 = 636 ohm. Determine: i. The value of capacitance of the bushing ii. The value of tan of the bushing (b) Prove the Schering bridge equation as stated below: R1 = R3C4 / C2 C1 = R4C2 / R3
Sri K.
QUESTIONS 1. Why is the Wheatstone bridge method more accurate for measuring resistance than the voltmeter-ammeter method used in Experiment 39? 2. What factors limit the accuracy of the Wheatstone bridge? 3. Is the terminal voltage of the power source critical to the accuracy of your experimental results? Explain your answer. 4. Can the resistors in an "unbalanced" Wheatstone bridge circuit be treated as a combination of series and/or parallel resistors? What about a "balanced" bridge? 5. What is the purpose of the resistor connected in series with the galvanometer? What would happen if it were initially set to 0 ̐ rather than to 500 ̐?
a. There are several techniques that can be used to measure the high voltage. Explain the measurement approach that can be carried out if the waveform is known. (5 marks) b. Design the circuit configuration of the Schering bridge that can be used to measure the dielectric constant and loss factor of a 1.5 mm thick epoxy sheet placed at bridge AB at 50 Hz using parallel plate electrode configuration. The electrode effective area is 130 cm2. At balance, a standard capacitor of 120 pF is placed at bridge BC, a variable capacitor of 80 pF is placed in parallel with resistor with 1200/π Ω at bridge CD and a variable resistor with 50 Ω is placed at bridge DA. If the voltage applied for testing is 8,000 V, what is the voltage that appears at AD and CD. (5 marks) [10 MARKS]
Madhur L.
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