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 ______.
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?
SGP Keys
1. above 33kv 45 directional relay
2. arc extinguisher 46 internal faults
3. copper tungsten alloy 47 transient
4. few cycles of supply voltage 48 unity
5. 0.003 sec 49 inductance
6. 20kg/cm2 50. above 132kv
7. symmetrical faults
8.copper
9current limiting devices
10. gas actuated relay
11.a circle passing through origin
12 motor protection
13. internal faults
14. directional relay
15. short lines
16 transformer
17 supply end
18 reactance relay
19 secondary winding
20 rectifier
21. exiters
22 unity
23 air blast CB
24 MVA
25 galvanised standered steel
26 internal faults
27 star – delta
28 inrush currents
29 5-10
30 swithing over voltages
31 single line to ground
32 confined the carrier signals in the line
33 80%
34 switching
35 transformer
36 -1
37 air blast
38 current between contacts
39 AC circuit breakers
40 arc quenching
41 2.55 times of symmetrical breaking capacity
42 resistance increases voltage increases
43 transformers
44 reactance relay
No comments:
Post a Comment