Question

If RR^‘, YY^‘ and BB^‘ constitutes three phase sequence if V^‘RR = Vmsinωt its corresponding field magnets are in clockwise direction, then V^‘YY =? (a) Vmsinωt (b) Vmsin(ωt+120⁰) (c) Vmsin(ωt-120⁰) (d) Vmsin(ωt-240⁰) I have been asked this question in an online quiz. Enquiry is from Polyphase 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

Correct choice is (c) Vmsin(ωt-120⁰) For explanation: If the field system is rotated in the anticlockwise direction, then the sequence of voltages in the three phases are in order RBY. The value of V^‘YY is V^‘YY = Vmsin(ωt-120⁰).