61. For an overhead line, the surge impedance is taken as
62. Which of the following distribution systems is more reliable?
63. Most of the high voltage transmission lines in India are
64. There is a greater possibility of occurrence of corona during
65. By which of the following methods string efficiency can be improved?
66. The material commonly used for sheaths of underground cables is
67. For which of the following equipment current rating is not necessary?
68. The voltage drop, for constant voltage transmission is compensated by installing
69. The operating voltage of extra high tension cables is upto
70. When a conductor carries more current on the surface as compared to core, it is due to
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