Mechanical Design of Overhead Lines Interview Questions:

Following are the below Mechanical Design of Overhead Lines Interview Questions and Important Questions which is very useful for interviews and exams

1. Name different components of an overhead line. Also explain the purpose for which they are used.

2. Classify the various supports used for overhead lines.

3. Briefly discuss the different types of supporting structures, which are used for overhead lines.

4. Discuss the various types of line supports.

5. What are the various types of line supports? Discuss the suitability of each with reference to system voltage and span.

6. Why steel towers are used ? Sketch and explain any one such tower.

7. Which material is used for overhead line conductor ? Discuss the reasons for selecting that material.

8. What advantage you get by using stranded conductors ?

9. What are the advantages and disadvantages of using aluminium over copper in power transmission.

10. What are the factors considered for the choice of the conductor materials for overhead lines ? Compare the properties of materials hard drawn aluminium, aluminium alloy for overhead line conductors.

11. What are ACSR conductors ? Give their advantages.

12. Give reasons for the following : ACSR conductors are preferred for transmission and distribution lines.

13. Is sag desirable or an evil for a transmission line ? What are the disadvantages of providing too much or too small sag in a transmission line ?

14. What is sag ? What factors affects sag ?

15. What is sag in overhead line ? Discuss the disadvantages of too small or too large sag on a line ?

16. Prove that a transmission line conductor between two supports at equal heights takes the form of a catenary.

17. Derive an expression for sag of a line supported between two supports at the same height.

18. Prove that a transmission line conductor between two supports at equal heights takes the form of a catenary. Derive expressions for sag and length of conductor.

19. Show how the sag of an overhead line can be calculated in case of supports at different levels.

20. Discuss the effect of wind and ice on sag.

21. Deduce an approximate expression for calculating sag in overhead line with conductors suspended between level supports. Show also how the effects of wind and ice can be taken into account when making calculations for sag.

22. Derive an expression for sag and tension in a power conductor strung between two supports at equal heights taking into account the wind and ice loadings also.

23. What is a stringing chart ? What is its utility ?

24. Explain the necessity of a stringing chart for a transmission line and show how such chart can be constructed.

25. Explain the necessity and the method of preparing “stringing charts” for overhead transmission lines.

26. Derive an equation to calculate the conductor tension under erection condition if the conductor tension and loading under bad weather conditions are known.

27. What is the use of a sag template ? Describe it in detail.

28. Why do the vibrations get generated in conductors ? How are they damped ?

29. Explain various vibration dampers.

30. Write short notes on the following :

• Mechanical features of overhead line.
• Conductor materials of transmission lines.
• Sag templates and their applications.
• Types of vibrations in conductors.
• Vibration and vibration dampers.