Module-1Set-1Short Questions1. Define Skin effect. On what factors does the skin effect depend.2. What is meant by proximity effect?3. Differentiate the stranded conductor and bundled conductor.4. List out the advantages of double circuit lines.5. Define - Self and mutual G.M.D.6. What is meant by inductive interference?7. What is transposition of conductors?8. What is ACSR conductor?9. What is fictitious conductor radius?10. Define unsymmetrical and symmetrical spacing.

Long Questions

1. From the fundamentals derive an expression for inductance of a single phase transmission system.2. Derive an expression for capacitances of a single phase transmission system and discuss the effect of earth on capacitance with suitableequation.3. Derive an expression for inductancei) Of a single-phase overhead line.ii) A conductor is composed of seven identical copper strands each having a radius r. Find the self-GMD of the conductor.4. Derive an expression for the capacitance between conductors of a single phase overhead line.5. Find the capacitance between the conductors of a single-phase 10 km long line. The diameter of each conductor is 1.213 cm. The spacingbetween conductors is 1.25 m. Also find the capacitance of each conductorneutral.

Set-2Short Questions11. State why transposition of line conductors are needed?12. List the advantages of bundled conductors.13. What are the factors that affect the skin effect?14. Why the effective resistance is more than the static resistance of a transmission line?15. Why does a transmission lines have resistance, inductance, and capacitance?16. List the factors that governing the capacitance of a transmission line.17. State the advantages of double circuit line over single circuit line.18. What do you understand by inductive interference?19. What is corona? State its advantages & disadvantages.20. Define critical disruptive voltage.

Long Questions1. Derive the expression for inductance of a two wire 1 transmission line.2. Derive the expression for capacitance of a 1 transmission line.3. (i) What are the advantages of bundled conductors?(ii) Derive the expression for capacitance of a double circuit line for hexagonal spacing. (iii) Why is the concept of selfGMD is not applicable for capacitance?

4. (i) Explain clearly the skin effect and the proximity effects when referredto overhead lines.(ii) Write a short note on the inductive interference between power and communication lines.5. ( i) Derive the expression for the capacitance per phase of the 3 phase double circuit line flat vertical spacing with transposition.(ii) A 3 overhead transmission line has its conductors arranged at thecorners of an equilateral triangle of 2 m side. Calculate the capacitanceof each line conductor per km. Given the diameter of each conductor is 1.25 cm.

Set-3Short Questions1. What are the factors which affect corona?2. Define transmission efficiency.3. What are the advantages of neutral grounding?4. What is earth resistance?5. Define distribution substation.6. Define service mains?7. What are the types of nature of current in distribution system?8. What is interconnected system.9. State the advantage of ring main distributor10. What is earth resistance?

Long Questions1. Find the capacitance per km per phase of a 3 line arrangement in a horizontal plane spaced 8 meters apart. The height of all conductors above the earth is 13 meters. The diameter of each conductor is 2.6 cm. The line is completely transposed and takes the effect of ground into account.2. 10. Discuss the concept of GMR and GMD in the calculation of transmission line inductance.3. (i) Derive the expression for the voltage inducedin communication linesdue to current in power lines.(ii) Explain the various factors affecting corona loss and methods ofminimizing them.4. Derive the expression for inductance of a 3 phase line withUnsymmetrical & symmetricalspacing.5. A 220KV, 50Hz, 200Km long three phase line has its conductors on thecorners of a triangle with sides 6m,6m and 12m. The conductor radiusis 1.81cm. Find the capacitance per phase per km, capacitive reactance per phase, charging current and total charging Mega volt amperes.6. Derive the equation of capacitance of a 3 phase unsymmetrical spaced& symmetrically spaced overhead lines.7. Calculate the loop inductance per km of a single phase line comprisingof 2 parallel conductors 1m apart and 1 cm in diameter, when thematerial of the conductor isi) Copperii) Steel of relative permittivity 508. Calculate the capacitance of a 100km long 3 phase,50 Hz overheadtransmission line consisting of 3 conductors each of diameter 2 cm andspaced 2.5m at the corners of an equilateral triangle.