Question

The three impedances Z1 = 20∠30⁰Ω, Z2 = 40∠60⁰Ω, Z3 = 10∠-90⁰Ω are delta-connected to a 400V, 3 – Ø system. Find the line current I2. (a) (-27.32+j10) A (b) (27.32+j10) A (c) (-27.32-j10) A (d) (27.32-j10) A The question was posed to me in exam. I'm obligated to ask this question of Three-Phase Unbalanced Circuits 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

Correct option is (a) (-27.32+j10) A For explanation: The line current I2 is the difference of IY and IR. So the line current I2 is I2 = IY – IR = (-27.32+j10) A.