Performance of Short and Medium Transmission Lines Interview Questions:

Following are the below Performance of Short and Medium Transmission Lines Interview Questions and Important Questions which is very useful for interviews and exams

1. Along with circuit representations, explain the basis of categorization of short, medium and long transmission lines.

2. Identify the criterion for classification of transmission lines. Which transmission line representation is close to actual system dynamics ?

3. Distinguish between short, medium and long transmission lines.

4. Derive an expression for voltage regulation of a short transmission line with vector diagram.

5. Describe three-phase short line calculations.

6. Draw the phasor diagram of a short transmission line and derive an expression for voltage regulation.

7. Obtain the expression of ‘voltage regulation’ and ‘efficiency’ of a short transmission line in terms of line parameters.

8. Define regulation, efficiency, losses and power factor at each end of the line and explain how these characteristics are affected by the constants of the line.

9. Explain the effect of load power factor on the transmission efficiency and voltage regulation of transmission line.

10. Explain the effect of load power factor on regulation and efficiency of a transmission line.

11. Show a diagrammatic representation of a medium line in terms of its nominal-π model. Indicate also the values of series impedance and shunt admittance of the model in terms of the resistance, inductance and capacitance per unit length of the line.

12. How are transmission lines classified ? Obtain the relation between the sending-end and receiving-end voltages and currents of a medium line using nominal-π representation.

13. Draw and explain the equivalent circuits and phasor diagrams for the nominal π and T methods in detail.

14. Draw phasor diagrams for a nominal π circuit and nominal T circuit of transmission line. Derive expressions for sending-end voltage and current in each case.

15. Explain Ferranti effect and proximity effect.

16. What is Ferranti effect ? Explain it with the help of phasor diagram.

17. Explain by means of phasor diagram the ‘Ferranti effect’ in transmission lines.

18. Whal is Ferranti Effect ? Derive an expression for the voltage rise of an unloaded line.

19. A long transmission line is not loaded ? What will be the voltage at the receiving end compared to the sending-end voltage ? Give reasons.

20. Explain the Ferranti effect and derive an expression for power loss in an open-circuited line.

21. Explain the influence of capacitance on performance of loaded line.

22. Define the general network for localized capacitance method to represent the transmission lines over 100 km long.

23. Obtain A, B, C, D constants for a short transmission line.

24. Derive the A, B, C, D constants for the transmission line represented by nominal-T section.

25. Evaluate the generalized circuit constants for (i) short transmission line, (ii) medium transmission line nominal-T method.

26. Evaluate the generalized circuit constants for medium line using nominal-π method.

27. Write short notes on the following :

• Classification of transmission line.
• Voltage regulation of transmission lines.
• Effect of load power factor on the transmission efficiency and voltage regulation of a transmission line.
• Ferranti effect.