Question

A symmetrical star connected system has VRN = 230∠0⁰. The phase sequence is RYB. Find VRY. (a) 398.37∠30⁰ (b) 398.37∠-30⁰ (c) 398.37∠90⁰ (d) 398.37∠-90⁰ I had been asked this question in an interview for job. Query is from Voltage, Current and Power in a Star Connected System topic in chapter 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

Right option is (a) 398.37∠30⁰ Easiest explanation: Since the system is a balanced system, all the phase voltages are equal in magnitude but displaced by 120⁰. VRN = 230∠0⁰V. VRY = √3×230∠(0^o+30^o)V=398.37∠30^oV.