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Find the equivalent star network.(a) 2.3ohm, 2.3ohm, 2.3ohm(b) 1.2ohm, 1.2ohm, 1.2ohm(c) 3.3ohm, 3.3ohm, 3.3ohm(d) 4.5ohm, 4.5ohm, 4.5ohmI got this question in final exam.I would like to ask this question from Delta Star Transformation topic in division Network Theorems of Basic Electrical Engineering

Answer»

The correct ANSWER is (b) 1.2ohm, 1.2ohm, 1.2ohm

The EXPLANATION: The 6 ohm and 9 ohm resistances are connected in parallel. Their equivalent resistances are: 6*9/(9+6)=3.6 ohm.

The 3 3.6 ohm resistors are connected in delta. Converting to STAR:

R1=R2=R3= 3.6*3.6/(3.6+3.6+3.6)=1.2 ohm.



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