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 B and C?(a) Rc+Rb+Rc*Rb/Ra(b) Rc+Rb+Ra*Rb/Rc(c) Ra+Rb+Ra*Rc/Rb(d) Rc+Rb+Rc*Ra/RbThis question was posed to me by my school principal while I was bunking the class.I want to ask this question from Star Delta Transformation in chapter Network Theorems of Basic Electrical Engineering

Ra is resistance at A, Rb is resistance at B, Rc is resistance at C in

1.	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 B and C?(a) Rc+Rb+RcRb/Ra(b) Rc+Rb+RaRb/Rc(c) Ra+Rb+RaRc/Rb(d) Rc+Rb+RcRa/RbThis question was posed to me by my school principal while I was bunking the class.I want to ask this question from Star Delta Transformation in chapter Network Theorems of Basic Electrical Engineering
Answer» CORRECT choice is (a) Rc+Rb+RcRb/Ra For EXPLANATION I would say: 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 B and C = Rc+Rb+RcRb/Ra.

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