1. Oil immersed type reactors are used for voltages __________.
2. A circuit breaker is essentially _________.
3. The arcing contacts for a circuit are made up of ______.
4. The fault clearing time of a circuit breaker is usually of ________.
5. For modern circuit breakers, the time of closing the cycle is _______.
6. The pressure of air used in air blast circuit breakers is around _____.
7. The rating of circuit breaker is usually determined on the basis of ____.
8. Busbars are usually made of _______.
9. A fuse is normally a ___________.
10. Buchholz relay is a ___________.
11. Mho relays have an R-X plane characteristic depicted by __________.
12. Under voltage relays are mostly used for _______.
13. Differential relays are used for protection of equipment against _________.
14. Earth fault relays are _____________.
15. Reactance relay are employed for phase fault in ____________.
16. Location of lightning arrestor is near a ___________.
17. Grounding is done generally at _______.
18. A relay used on short transmission line is ___________.
19. In tap changing transformers, the tappings are provided on _______.
20. Which of the following is a static excitor?
21. Which of the following equipment is not installed in a substation?
22. The recovery voltage will be maximum for power factor of ____.
23. Arc chutes are used in _______________.
24. Breaking capacity of circuit breakers is usually expressed in ___________.
25. Earth wire is made of ______.
25. Earth wire is made of ______.
26. A Buchholz relay protect a transformer from__________
27. In Mertz –Price protection, the CT’s secondary of delta – star power transformer will be in______________
28. For transformer protection, a differential relay is biased to avoid mal operation due to_____________
29.The percentage bias for a generator protection lies between____
30.For the protection of transformers, harmonic restraint is used to guard against_________________
31.The bus-bar zone faults are generally__________
32.A line trap in a long transmission line is used to _________
33.First zone distance relay protects a transmission line section up to full length.___________
34.The over voltage surges in the power systems may be caused by___________
35.Location of lightning arrestors is near a___________
36.The reflection coefficient of a short circuited line is ___________
37.In railway applications Circuit Breakers is used__________
38.Arc is initiated due to___________
39.Current zero interruption method used in________
40.Minimum oil circuit breakers use oil for_____________
41.Making capacity of a circuit breaker is equal to_____________
42.Arc in a circuit behaves as a____________
43.Differential relays are used for protection of___________
44.The relay used on short transmission lines____________
45.Both voltage and current signals are required for____________
46.Differential relays used for the protection of equipment against________
47.Auto reclosure improves what type of stability.___________
48.what is the power factor of an arc?_________
49.Peterson coil has a reactance called?__________
50.what is the rating of SF6?___________KEY
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