Question

The value of the 3 resistances when connected in star connection is_________

(a) 2.32ohm,1.22ohm, 4.54ohm

(b) 3.55ohm, 4.33ohm, 5.67ohm

(c) 2.78ohm, 1.67ohm, 0.83ohm

(d) 4.53ohm, 6.66ohm, 1.23ohm

I got this question during an interview for a job.

Asked question is from Delta Star Transformation topic in division Network Theorems of Basic Electrical Engineering

Answer 1

Right choice is (c) 2.78ohm, 1.67ohm, 0.83ohm

The best explanation: Following the delta to star conversion:

R1=10*5/(10+5+3) = 2.78 ohm

R2=10*3/(10+5+3) = 1.67 ohm

R3=5*3/(10+5+3) = 0.83 ohm.