For differential protection of power transformer (delta-delta) the current transformers will have

A. Delta delta connection
B. Star Delta connection
C. Star star connection
D. Delta star connection

Answer with Explanation:
C. Star star connection

Explanation:



Most Asked Transmission and Distribution Mcqs With Full Explanation and Exam notes 

1. Under overexcitation synchronous phase modifier works as

2. The neutral of the power system may be connected to earth

3. A 100 Ah capacity battery should deliver a current of 10 A for approximately _____ hrs.

4. For the 400KV line, The Spacing Between phase conductors is around 

5. Shunt capacitors in a sub-station

6. An alternator is said to be over-excited when it is operating at

7. Series capacitors are used to

8. Disadvantage of low power factor is

9. The color of neutral three core flexible cable is

10. The location of ground faults in underground cables can be found by

11. Fault location in an HV cable is done by

12. The insulation resistance of a cable of length 10 km is 1 MΩ. its resistance for 50 km length will be

13. Which of the following is not a valid advantage of bundle conductor?

14. The surge resistance of cables is

15. Skin effect is only noticeable at _______ frequencies. 

16. When transmission voltage is increased, the line losses are

17. Var compensators are used to

18. High voltage transmission lines use

19. The material used for insulators are

20. Isolator in substation is open under ------------- condition?

21. The surge impedance value of overhead lines is

22. Surge impedance loading of a transmission line is also known as

23. Cables used for underground services from 33 kV to 60 kV are

24. The minimum clearance distance that equipment should be kept away from 50 kV power lines is

25. The cheap and temporary system of the internal wiring is?

26. As per the Indian Electricity rule in overhead systems, the recommended span in the case of wooden poles is ______.

27. To improve power factor and feeder voltage controller, which compensation is required

28. Method of voltage control adopted for transmission lines in AC systems is

29. The skin effect in a transmission line is affected by

30. What is the result of the Skin Effect?

31. Transmission efficiency increases as

32. An isolator in Hv substation is used for

33. For a short tie line fed at both end , what is the best choice of protection?

34. For protection of transformer, restraint used to guard against

35. In overhead transmission line the effect of capacitance can be neglected when the length of the line is less than 

36. Pin insulators are used up to voltage of about 

37. Corona effect can be detected by 

39. The effect of wind pressure is more predominant on

40. Transposition of the transmission line is adopted to make ......... uniform throughout the line.

41. The Power Transmitted will be maximum when 

42. In a substation the equipment used to limit short circuit current level is

43. In order to increase the limit of the distance of transmission line

44. In series R - L - C circuit the condition for resonance is 

45. The most commonly used method for the protection of three phase feeder is

46. Power station and substations are protected against Direct  strokes lightning using


Transformer Most asked Mcqs With Full Explanation and Exam Notes 

1. The secondary winding of which of the following transformers is always kept closed?

2. Which type of connection is employed for current transformers for the protection of star- delta connected 3-phase transformer?

3. Star-star power transformer is protected by current transformer having

4. In the case of transformer Buchholz relay is used to protect from 


More Circuit Breaker MCQS with Full Explanation

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