Static Relays Interview Questions:

Following are the below Static Relays Interview Questions and Important Questions which is very useful for interviews and exams

1. Compare a static relay with electromagnetic relays.

2. What are the advantages and limitations of static relays over electromagnetic relays. Also discuss the main components of a static relay.

3. Compare electronic relays with static relays.

4. Explain the concept of duality in static comparators.

5. Discuss about phase and amplitude comparators in detail.

6. Describe various types of phase comparators used in static relay.

7. What do you understand by amplitude comparator and phase comparator? Prove the duality between them with the help of phasor diagrams.

8. Describe various types of phase comparators used in static relays.

9. What are the types of phase comparators ? Explain integrating type phase comparators.

10. Describe the coincidence principle used in phase comparators.

11. Explain how inverse time overcurrent relay is different in operation from definite time overcurrent relay. With neat circuit diagram explain the working of inverse-time overcurrent static relay.

12. Explain clearly how a phase comparator is used in the protective relay systems.

13. Realize impedance relay using static components.

14. Realize mho relay characteristic using static components.

15. By taking an example, explain the dual input comparator relay threshold characteristic.

16. By taking an example, explain the threshold characteristics of a dual input comparator relay.

17. What is comparator ? Explain with phasor diagrams characteristic of multi-input comparators.

18. Prove that two input comparators are duals of each other. How would your realise a reactance relay characteristic using static comparators.

19. With the help of neat diagram explain the principle of static differential relay.

20. Show that the polar curve of a biased differential relay using a static comparator is a circle. Why does the area outside the circle represent the operating zone ?

21. Discuss the advantages of digital relays. Describe the basic functional blocks of a digital relay.

22. Write short notes on the following :

• Essential components of a static relay.
• Merits of static relays over electromagnetic relays.
• Hall-effect relays.
• Magnetoresistivity phase comparator.
• Level detector.
• Averaging type instantaneous amplitude comparator.
• Integrating type phase comparator with rectifier type AND gate.
• Static relays.