Question

In a delta connected system, the voltage across the terminals R and Y is 400∠0⁰. Find the line voltage VYB. (a) 400∠120⁰ (b) 400∠-120⁰ (c) 400∠240⁰ (d) 400∠-240⁰ This question was posed to me in unit test. This is a very interesting question from Voltage, Current and Power in a Delta Connected System 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 answer is (b) 400∠-120⁰ Explanation: As |VYB| = |VPh|, and is displaced by 120⁰, therefore the line voltage VYB is VYB = 400∠-120⁰V. A balanced three phase, three wire, delta connected system is referred to as mesh connection because it forms a closed circuit.