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| Isolator |
Power System Most asked MCQs
1. The advantages of high transmission voltage are
2. The charging current drawn by the cable is
3. The fact that current density is higher at the surface when compared to the centre is known as
4. In which of the following transmission lines capacitance effect is negligible?
5. Which Relay is used for feeders ?
7. Merz price protection is used on
8. The maximum power can be achieved in a transmission line by
9. The distribution constant of the transmission line is
10. Proximity effect is more in case of
More Earthing MCQs with Full Explanation and Important Notes
1. The neutral of the power system may be connected to the earth
2. Grounding of substation provides
3. Earthing is necessary to give protection against
4. Standard wire gauge used for earthing lead should not be thinner than
5. What should be the value of earthing resistance for large power stations?
6. The earthing wire should have
7. The size of the earth wire is determined by
8. The minimum length of pipe electrode used for earthing should not be less than
10. Earth resistance in a typical domestic wiring is
More MCQs With Fully Explained
1. Under overexcitation synchronous phase modifier works as
2. The neutral of the power system may be connected to the earth
3. The time to open the circuit breaker contact is called as
4. A 100 Ah capacity battery should deliver a current of 10 A for approximately _____ hrs.
5. For the 400KV line, The Spacing Between phase conductors is around
6. Shunt capacitors in a sub-station
7. An alternator is said to be over excited when it is operating at
8. In the case of transformer Buchholz relay is used to protect from
9. Series capacitors are used to
10. Disadvantage of low power factor is
11. The colour of neutral three core flexible cable is
12. The location of ground faults in underground cables can be found by
13. Fault location in an HV cable is done by
15. Which of the following is not a valid advantage of bundle conductor?
16. Star-star power transformer is protected by current transformer having
17. The surge resistance of cables is
18. Skin effect is only noticeable at _______ frequencies.
19. When transmission voltage is increased, the line losses are
20. Var compensators are used to
21. High voltage transmission lines use
22. The material used for insulators are
24. Isolator in sub station is open under ------------- condition?
38. A thermal protection relay provides protection against what?
39. Mho relays are used for the protection of which of the following lines?
40. The rate of rise of re-striking voltage is dependent upon
41. If sag in an overhead line increase, tension in the line
42. The secondary winding of which of the following transformers is always kept closed?
43. The neutral of the power system may be connected to earth
What is Auto-Recloser In Transmission System ? How its Works ?
What is Aviation Light ? Why it is used ?