Two-Port Networks – Verified PYQ Authority Guide
Two-Port Networksis organised as a topic-level PYQ authority page. It brings together the strongest verified question clusters, exam/year coverage and concept-level practice so students can revise the topic without jumping through unrelated notes. Every factual learning cue below is drawn from the existing verified, published and approved English PYQ corpus or from its Knowledge Graph relationships; the hub does not invent unsupported technical claims.
PYQ evidence snapshot
3 verified PYQsare currently mapped to this Topic hub. The represented years include2026, 2025. Exam coverage currently includesDeputy Executive Engineer (Electrical), Class-2, Sports Authority of Gujarat / Assistant Engineer (Electrical), Class-2,, Assistant Engineer (Electrical), Class-2, Road and Building Department. Subject context includesElectrical Engineering. These values come from live mappings and can expand automatically when new verified PYQs are added.
Most useful verified PYQs to solve first
Start with the actual questions rather than memorising a generic note. The links below are ranked from the mapped corpus using repeat history and editorial quality, while the complete explanation stays on the individual question page.
- A two-port network has Z11 = 20 Ω, Z22 = 10 Ω, Z12 = Z21 = 5 Ω. Then 1. Network is reciprocal. 2. Input impedance depends on load connected. 3. Z-parameters…
Deputy Executive Engineer (Electrical), Class-2, Sports Authority of Gujarat / Assistant Engineer (Electrical), Class-2, · 2026 · Reciprocity and Loaded Input Impedance
Z-parameters express two-port terminal voltages as linear combinations of port currents. Reciprocity requires Z12=Z21; symmetry additionally requires Z11=Z22. Key relation: V1=Z11I1+Z12I2; V2=Z21I1+Z22I2. Exam focus:… - A two-port network has defined Z-parameters. Then 1. Defined under open-circuit conditions. 2. Z11 represents input impedance. 3. Z12 represents transfer impedance. 4. Can be used in network interconnections. Which of the…
Deputy Executive Engineer (Electrical), Class-2, Sports Authority of Gujarat / Assistant Engineer (Electrical), Class-2, · 2026 · Impedance Parameters
For a linear two-port, terminal voltages are expressed in terms of terminal currents. Open-circuiting a port forces its current to zero and isolates the… - In the circuit shown below, find the Z-parameter Z₁₂.
Assistant Engineer (Electrical), Class-2, Road and Building Department · 2025 · Transfer Impedance Z12
GPSC revised the final answer to option C. For Z-parameters, Z12 = V1/I2 with I1 = 0. With port 1 open, no current flows…
Formula & key-relationship bank from verified solutions
V1=Z11I1+Z12I2; V2=Z21I1+Z22I2.V1 = Z11 I1 + Z12 I2; V2 = Z21 I1 + Z22 I2. Z11=(V1/I1)|I2=0, Z12=(V1/I2)|I1=0.V₁ = Z₁₁I₁ + Z₁₂I₂ Set I₁ = 0: Z₁₂ = V₁/I₂ = 5 Ω
Use these as revision triggers and open the linked PYQ before applying a formula numerically; variable definitions and assumptions belong to the exact solved question.
Core ideas repeatedly reinforced by the solved corpus
- Z-parameters express two-port terminal voltages as linear combinations of port currents. Reciprocity requires Z12=Z21; symmetry additionally requires Z11=Z22. Key relation: V1=Z11I1+Z12I2; V2=Z21I1+Z22I2. Exam focus: Reciprocal: Z12=Z21. Symmetric: Z11=Z22. Common trap: Do not confuse reciprocity with symmetry.
- For a linear two-port, terminal voltages are expressed in terms of terminal currents. Open-circuiting a port forces its current to zero and isolates the required coefficient. Key relation: V1 = Z11 I1 + Z12 I2; V2 = Z21…
- GPSC revised the final answer to option C. For Z-parameters, Z12 = V1/I2 with I1 = 0. With port 1 open, no current flows through the 10 Ω left series arm, so the voltage at port 1 equals…
Exam tips already validated in SRO solutions
- Reciprocal: Z12=Z21. Symmetric: Z11=Z22.
- Memorize the condition “Z → open circuit (I=0)” and “Y → short circuit (V=0)”.
- Apply the Z-parameter test condition before combining resistors.
Common mistakes to avoid
- Do not confuse reciprocity with symmetry.
- Do not label Z12=Z21 as symmetry; that equality is the reciprocity condition.
- The 10 Ω and 20 Ω series resistors are not both in the transfer path under the I1=0 condition.
Topic and concept coverage
Mapped topic labels includeTwo-Port Networks. The concept trail includesImpedance Parameters, Reciprocity and Loaded Input Impedance, Transfer Impedance Z12. Use these labels as a revision map: move from the broad area to the narrow concept, solve a verified PYQ, inspect the detailed reasoning, and then attempt another question from the same cluster.
Knowledge Graph navigation
Continue withNetwork Theory,Y Parameters,Z Parameters,Electrical Engineering,Impedance Parameters,Output Admittance Y22,Reciprocity and Loaded Input Impedance. These are canonical SRO entity links based on the Knowledge Graph and shared question mappings, not keyword-stuffed tag pages.
How to revise this authority page efficiently
- Solve before reading:answer a mapped PYQ first.
- Read the exact explanation:verify the correct principle, formula, distractor logic and common mistake on that question page.
- Move one level in the graph:use the closest concept/sub-topic/topic link rather than opening unrelated content.
- Reattempt:solve another verified PYQ from this hub and check whether the same error repeats.
Quality scope:this page is automatically maintained from SRO’s verified mapped corpus. It enriches one canonical authority URL instead of generating multiple near-duplicate pages for keyword variants. Manual authority articles are never overwritten by the automated engine.