Question

The equation of instantaneous power is? (a) P (t) = (VmIm/2)(cos⁡(2ωt+θ)+sin⁡θ) (b) P (t) = (VmIm/2)(sin⁡(2ωt+θ)+cos⁡θ) (c) P (t) = (VmIm/2)(cos⁡(2ωt+θ)+cos⁡θ) (d) P (t) = (VmIm/2)(sin⁡(2ωt+θ)+sin⁡θ) The question was posed to me in an online interview. This interesting question is from Instantaneous Power topic in chapter Power and Power Factor 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 (c) P (t) = (VmIm/2)(cos⁡(2ωt+θ)+cos⁡θ) To elaborate: The equation of instantaneous power is P (t) = (VmIm/2)(cos⁡(2ωt+θ)+cos⁡θ). It consists of two parts. One is a fixed part and the other is time varying which has frequency twice that of the voltage or current wave forms.