81. Owing to skin effect
82. The spacing between phase conductors of a 220 kV line is approximately equal to
83. The skin effect of a conductor will reduce as the
84. Which of the following is the demerit of a 'constant voltage transmission system'?
85. Electromechanical voltage regulators are generally used in
86. The presence of ozone due to corona is harmful because it
87. The following system is not generally used
88. A conductor, due to sag between two supports, takes the form of
89. The cause of damage to the lead sheath of a cable is
90. The operating voltage of super-tension cables is up to
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