21. Which of the following are the constants of the transmission lines?
22. Which of the following materials is used for overhead transmission lines?
23. Which of the following relays is used on long transmission lines?
24. Which of the following methods is used for laying of underground cables?
25. The minimum clearance between the ground and a 220 kV line is about
26. A booster is a
27. The effect of corona can be detected by
28. In a D.C. 3-wire distributor using balancers and having unequal loads on the two sides
29. High voltage transmission lines use
30. Which of the following is the demerit of a 'constant voltage transmission system' ?
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