Transmission Lines – Verified PYQ Authority Guide
Transmission Lines is 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
4 verified PYQs are currently mapped to this Topic hub. The represented years include 2026. Exam coverage currently includes Deputy Executive Engineer (Electrical), Class-2, Sports Authority of Gujarat / Assistant Engineer (Electrical), Class-2,. Subject context includes Electrical 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.
- Consider the following statements regarding Corona: 1. It causes radio interference. 2. It attenuates lightning surges. 3. It causes power loss. 4. It is more prevalent in the middle conductor of a…
Deputy Executive Engineer (Electrical), Class-2, Sports Authority of Gujarat / Assistant Engineer (Electrical), Class-2, · 2026 · Corona Effects on Overhead Lines
Corona is ionization of air around an overhead conductor when surface electric field exceeds the disruptive critical value. It causes power loss, audible noise… - The capacitance of an overhead transmission line increases with 1. increase in mutual geometrical mean distance. 2. increase in height of conductors above ground. Select the correct answer from the following:
Deputy Executive Engineer (Electrical), Class-2, Sports Authority of Gujarat / Assistant Engineer (Electrical), Class-2, · 2026 · Effect of Spacing and Ground on Capacitance
Capacitance is larger when conductors/electrodes are effectively closer. In overhead lines, larger phase spacing weakens electric coupling between phases. Key relation: Simple line: C… - Consider the following statements: Surge impedance loading of a transmission line can be increased by 1. increasing its voltage level 2. addition of lumped inductance in parallel 3. addition of lumped capacitance…
Deputy Executive Engineer (Electrical), Class-2, Sports Authority of Gujarat / Assistant Engineer (Electrical), Class-2, · 2026 · SIL and Series Compensation
Surge impedance loading is the power at which a transmission line's reactive generation by capacitance approximately balances reactive absorption by inductance. Series capacitive compensation… - Consider the following statements regarding Skin Effect: 1. Skin effect causes current to concentrate near surface of conductor at high frequency. 2. Skin depth decreases with increase in frequency. 3. Skin effect…
Deputy Executive Engineer (Electrical), Class-2, Sports Authority of Gujarat / Assistant Engineer (Electrical), Class-2, · 2026 · Skin Depth and AC Resistance
Skin effect is the tendency of alternating current to crowd toward a conductor surface as frequency rises. Skin depth decreases with frequency and also…
Formula & key-relationship bank from verified solutions
Peek-type relation: corona loss rises strongly with (V−V_c)² once V>V_c.Simple line: C ∝ 1/ln(D/r). Single conductor to ground (image model): C ∝ 1/ln(2h/r). Therefore dC/dD<0 and dC/dh<0.SIL≈V_LL²/Z_c.δ=√(2/(ωμσ)).
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
- Corona is ionization of air around an overhead conductor when surface electric field exceeds the disruptive critical value. It causes power loss, audible noise and radio interference, but can attenuate steep lightning surges by dissipating energy. Key relation:…
- Capacitance is larger when conductors/electrodes are effectively closer. In overhead lines, larger phase spacing weakens electric coupling between phases. Key relation: Simple line: C ∝ 1/ln(D/r). Single conductor to ground (image model): C ∝ 1/ln(2h/r). Therefore dC/dD<0 and…
- Surge impedance loading is the power at which a transmission line's reactive generation by capacitance approximately balances reactive absorption by inductance. Series capacitive compensation reduces effective series reactance/surge impedance and therefore can increase SIL. Key relation: SIL≈V_LL²/Z_c. Exam…
- Skin effect is the tendency of alternating current to crowd toward a conductor surface as frequency rises. Skin depth decreases with frequency and also depends on permeability and conductivity. Key relation: δ=√(2/(ωμσ)). Exam focus: Higher f → smaller…
Exam tips already validated in SRO solutions
- Larger conductor diameter and spacing generally raise corona inception voltage.
- Inductance generally increases with spacing; capacitance generally decreases with spacing.
- Higher voltage has a squared effect on SIL.
- Higher f → smaller skin depth → higher AC resistance.
Common mistakes to avoid
- Do not confuse corona with skin effect inside the conductor.
- Mixing up the spacing trends of line inductance and capacitance.
- Line length itself is not the defining variable in the basic SIL formula.
- Skin effect is weak at low frequency and stronger at high frequency.
Topic and concept coverage
Mapped topic labels include Transmission Lines. The concept trail includes Corona Effects on Overhead Lines, Effect of Spacing and Ground on Capacitance, SIL and Series Compensation, Skin Depth and AC Resistance. 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 with Power Systems, Corona, Line Capacitance, Skin Effect, Surge Impedance Loading, Electrical Engineering, Corona Effects on Overhead Lines, Effect of Spacing and Ground on Capacitance, SIL and Series Compensation, Skin Depth and AC Resistance. 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.