81. The purpose of providing dummy coils in a generator is
82. Brushes of D.C. machines are made of
83. Lap winding is composed of
84. Wave winding is composed of
85. The commutator segments are connected to the armature conductors by means of
86. Which of the following components of a D.C, generator plays vital role for providing direct current of a D.C. generator?
87. Open circuited armature coil of a D.C. machine is
88. In lap winding, the number of brushes is always
89. Which of the following generating machine will offer constant voltage on all loads?
90. The number of brushes in a commutator depends on
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