Tariffs and Power Factor Improvement Interview Questions:

Following are the below Tariffs and Power Factor Improvement Interview Questions and Important Questions which is very useful for interviews and exams

1. What are the main points to he considered while fixing the tariff ?

2. What are the main objectives in framing a tariff ? Discuss various types of tariffs.

3. Define the following terms in connection with the power supply system : connected load, maximum demand, two part tariff, diversity factor.

4. What are the different types of tariff used by the electricity authority ? Discuss any two of them and indicate the type of consumers where such tariffs are used.

5. Discuss different types of tariffs used for charging the consumers of electrical energy.

6. Explain giving examples : (i) Flat rate tariff (ii) Block rate tariff (iii)Two part tariff (iv) Power factor tariff.

7. Explain the straight meter rate tariff and block meter rate tariff.

8. What do you understand by tariff? Explain briefly various types of tariffs.

9. Discuss the different types of tariffs used for charging the consumers electrical energy.

10. What is the special feature of two part tariff ? For which category of consumers is it used ?

11. What is the objective of tariff ? What type of tariff is employed for domestic consumers ? Why this tariff is not employed for bulk consumers ? Suggest and explain the tariff which encourages the consumers to keep load factor and power factor high.

12. In modern LT distribution stations the VAR meters are installed. What is the mechanism of charging the tariff related to reactive power and how the above can be effectively installed ?

13. A distribution company wants to charge and penalize the consumers in case of excessive loads of poor power factor. What charges should be made in present existing substation so as to meet the above ?

14. Give the basis for expressing the service cost of an electric supply as A + B kW + C kWh and explain the factors on which A, B and C depend.

15. What are objective of tariffs? What is the general form of tariff? Describe the straight meter rate and block meter rate tariffs. What do you mean by spot pricing?

16. What is spot pricing? What is its importance?

17. What are different types of loads and draw their chronological load curves.

18. What are the disadvantages of low power factor? Why do some agencies put a penalty for low power factor?

19. What is the effect of low power factor ? Explain the different methods to improve the power factor of the system.

20. What are the causes and effects of poor power factor ? Discuss any one method to improve the power factor.

21. What are the advantages of power factor improvement?

22. What are the advantages of power factor improvement. Explain how a synchronous capacitor can improve the power factor.

23. Explain the necessity of improving power factor.

24. Compare the advantages and disadvantages of using a synchronous condenser and a static capacitor for power factor improvement.

25. What do you understand by power factor ? Explain the necessity of improving power factor. Also discuss the factor which determines the economical limit of power factor correction.

26. What factors determine the economical limit of power factor correction ? Show that the economical limit to which the power factor of a lagging power factor load can be raised is independent of the original value of the power factor if the tariff consists of a fixed charge per kVA of maximum demand plus a flat rate per kWh.

27. Explain how the installation of a pf improvement device can augment the kW capacity of a generating station of a given kVA capacity.

28. List and explain the factors that influence the economic choice of equipment.

29. Write short notes on the following :

• Tariffs
• Tariffs methods of electrical energy
• Hopkinson demand rate
• Two part tariff.
• Power factor tariff.
• Power factor improvement.
• Power factor improvement using synchronous condensers.
• Necessity of power factor improvement.
• Economic limits of power factor improvement.
• Choice of equipment.