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Find the equivalent resistance between X and Y.

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Find the equivalent resistance between X and Y.

(a) 3.33 ohm

(b) 4.34 ohm

(c) 5.65 ohm

(d) 2.38 ohm

I had been asked this question in an online quiz.

The doubt is from Star Delta Transformation in portion Network Theorems of Basic Electrical Engineering

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Correct option is (d) 2.38 ohm

For explanation: The 3 2ohm resistors are connected in star, changing them to delta, we have R1=R2=R3= 2+2+2*2/2=6 ohm.

The 3 6ohm resistors are connected in parallel to the 10 ohm 5 ohm and 10ohm resistors respectively.

This network can be further reduced to a network consisting of a 3.75ohm and 2.73ohm resistor connected in series whose resultant is intern connected in parallel to the 3.75 ohm resistor.

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