Question

A three-phase balanced delta connected load of (4+j8) Ω is connected across a 400V, 3 – Ø balanced supply. Determine the phase current IY. (a) 44.74∠183.4⁰A (b) 45.74∠183.4⁰A (c) 44.74∠183.4⁰A (d) 45.74∠-183.4⁰A This question was addressed to me during an online exam. I'd like to ask this question from Three-Phase Balanced Circuits topic in section Polyphase Circuits of Network Theory Select the correct answer from above options network theory questions and answers, network theory questions pdf, network theory question bank, network theory gate questions and answers pdf, mcq on network theory pdf, gate network theory questions and solutions, network theory mcq Test , ies network theory questions, Network theory Questions for GATE EC Exam, Network Theory MCQ (Multiple Choice Questions)

Answer 1

The correct choice is (c) 44.74∠183.4⁰A Easy explanation: Taking the line voltage VRY = V∠0⁰ as a reference VRY = 400∠0⁰V, VYB = 400∠-120⁰V and VBR = 400∠-240⁰V. Impedance per phase = (4+j8)Ω = 8.94∠63.4⁰Ω. Phase current IY = (400∠120^o)/(8.94∠63.4^o)= 44.74∠-183.4⁰A.