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Ra is resistance at A, Rb is resistance at B, Rc is resistance at C in star connection. After transforming to delta, what is resistance between A and B?(a) Rc+Rb+Ra*Rb/Rc(b) Ra+Rb+Ra*Rc/Rb(c) Ra+Rb+Ra*Rb/Rc(d) Ra+Rc+Ra*Rc/RbThis question was posed to me in an online interview.This interesting question is from Star Delta Transformation in portion Network Theorems of Basic Electrical Engineering

Answer»

Correct choice is (c) Ra+Rb+Ra*Rb/Rc

Best explanation: After converting to the DELTA, each delta connected RESISTANCE is equal to the sum of the two resistances it is connected to+product of the two resistances DIVIDED by the remaining resistance. HENCE, resistance between A and B = Ra+Rb+Ra*Rb/Rc.



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