Question

The wattmeter method is used to measure power in a three-phase load. The wattmeter readings are 400W and -35W. Find the power factor. (a) 0.43 (b) 0.53 (c) 0.63 (d) 0.73 This question was addressed to me at a job interview. I'd like to ask this question from Power Measurement in Three-Phase Circuits topic in division 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) 0.43 To explain: We know tanØ = √3((WR – WY)/(WR + WY)) => tanØ = √3 (400-(-35))/(400+(-35))=2.064 => Ø = 64.15⁰. Power factor = 0.43.