Supply Systems Interview Questions:
Following are the below Supply Systems Interview Questions and Important Questions which is very useful for interviews and exams
1. Draw single line diagram of a typical power system. Locate various sections of it and mention there on typical voltages of generation, transmission and distribution.
2. Give a typical layout of a power system between generation and use of electrical power.
3. Explain the terms (i) Feeder (ii) Distributor and (iii) Service mains.
4. Distinguish between a feeder and a distributor. Draw single line diagram representing elements of a transmission system.
5. What is meant by the terms feeder, distributor and service mains ? Why the distribution by ac is considered superior to that by dc.
6. Compare between ac and dc systems for transmission and distribution.
7. Compare the advantages of using ac transmission system over dc system.
8. Give comparison between underground cables with overhead transmission lines.
9. Discuss the advantages of using overhead lines compared to underground cables.
10. What do you mean by single line diagram of power system ? What is the usefulness of drawing single line diagram ?
11. What do you understand by single line diagram of a power system ? What is the need of this diagram ?
12. Explain the influence of working voltage on the size of feeders and distributors in dc system.
13. Discuss the effect of transmission voltage on line performance. Derive any formula to support your answer.
14. Distinguish between a feeder, distributor and service main in distribution scheme. Show that the cross section of a feeder and distributor would be reduced to 1/k and 1/k2 of their respective values with an increase in working voltage by k times.
15. Discuss the effect of increase in voltage on the transmission line efficiency.
16. Compare the cross-sectional areas of conductors for dc two-wire system and single phase ac system assuming equal length, equal power, and equal losses.
17. Find the ratio of volume of copper required to transmit a given power over a given distance by overhead system using (i) dc two-wire system, (ii) 3-Φ, 3-wire ac system.
18. Compare the conductor requirement for 1-Φ ac system with 3-Φ ac system. Assume same maximum potential difference between conductor and earth.
19. Compare the copper volume of single-phase and three-phase three-wire supply system assuming equal power loss in transmitting same power over given distance.
20. A 3-phase 4-wire system is used for lighting. Compare the amount of copper required with that needed for a 2-wire de system with the same maximum voltage. Assume the same losses and balanced load. The neutral is one half of the respective outers.
21. Show that at higher voltages and higher power factor, the efficiency of transmission line will be increased. What are the limiting factors of high voltage transmission lines ?
22. Discuss about the factors affecting choice of transmission voltage level.
23. What are the advantages of high voltage transmission ? Give the limitations also.
24. Prove that the volume of conductor required in a transÂmission system is inversely proportional to the square of voltage as well as power factor of the load. State the conditions under which this statement is true ?
25. What is the most economical cross-sectional area ? Deduce its expression using Kelvin’s law.
26. Explain the practical limitations to application of Kelvin’s law for economical size of line conductor.
27. Write short notes on the following :
- DC system versus ac system for transmission and distribution of electrical power.
- Underground versus overhead system.
- Power system elements.
- Choice of voltage for transmission line.
- Kelvin’s law and its limitations.