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If a resistor Rx is connected between nodes X and Y, Ry between X and Y, Rz between Y and Z to form a delta connection, then after transformation to star, the resistance at node Y is?(a) RzRy/(Rx+Ry+Rz)(b) RzRx/(Rx+Ry+Rz)(c) RxRy/(Rx+Ry+Rz)(d) (Rz+Ry)/(Rx+Ry+Rz)I had been asked this question during an online interview.Query is from Star-Delta Transformation in section Useful Theorems in Circuit Analysis of Network Theory

Answer» CORRECT choice is (b) RzRx/(Rx+Ry+Rz)

Explanation: After TRANSFORMATION to STAR, the resistor at NODE Y is RzRx/(Rx+Ry+Rz) and this resistance LIES between Rx, Rz in star connection.


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