Question

For the circuit given below, the value of z22 parameter is ____________ (a) z22 = 20 Ω (b) z22 = 25 Ω (c) z22 = 30 Ω (d) z22 = 24 Ω I had been asked this question during an interview. This intriguing question originated from Advanced Problems on Two Port Network topic in section Two-Port Networks 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 option is (c) z22 = 30 Ω The explanation: z11 = \frac{V_1}{I_1} = \frac{(20+5)I_1}{I_1} = 25Ω V0 = \frac{20}{25} V1 = 20 I1 -V0 – 4I2 + V2 = 0 Or, V2 = V0 + 4I1 = 20I1 + 4I1 = 24 I1 Or, z21 = \frac{V_2}{I_1} = 24 Ω V2 = (10+20) I2 = 30 I2 Or, z22 = \frac{V_2}{I_1} = 30 Ω V1 = 20I2 Or, z12 = \frac{V_1}{I_2} = 20 Ω ∴ [z] = [25:20; 24:30] Ω.