Question

The values of z11 and z21 for a T circuit having resistances 20 Ω each is _____________ (a) 40, 20 (b) 40, 60 (c) 60, 40 (d) 40, 40 The question was asked in an online interview. I need to ask this question from Laplace Transform of a Periodic Function in section Application of the Laplace Transform in Circuit Analysis 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 choice is (a) 40, 20 To explain: To determine the values of z11 and z21, we apply a voltage source V1 to the input port and leave the output port open. Thus, z11 = \frac{V_1}{I_1} = \frac{(20+20) I_1}{I_1} = 40 Ω Now, z21 is the input impedance at port 1. So, z21 = \frac{V_2}{I_1} = 20 Ω.