Question

If a 1ohm 2ohm and 32/3ohm resistor is connected in star, find the equivalent delta connection.

(a) 34 ohm, 18.67 ohm, 3.19 ohm

(b) 33 ohm, 18.67 ohm, 3.19 ohm

(c) 33 ohm, 19.67 ohm, 3.19 ohm

(d) 34 ohm, 19.67 ohm, 3.19 ohm

The question was posed to me in an international level competition.

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

Answer 1

Right choice is (a) 34 ohm, 18.67 ohm, 3.19 ohm

Explanation: Using the formula for delta to star conversion:

Using the formula for delta to star conversion:

R1=1+2+1*2/(32/3)

R2=1+32/3+1*(32/3)/2

R3=2+32/3+2*(32/3)/1.