81. If an insulating material is operated beyond the maximum allowable temperature, its life is
82. Which of the following materials is used in the manufacture of resistance grids to be used in the starters of largemotors ?
83. Two holes in the disc of energy meter are drilled at the opposite sides of the spindle to
84. Standard resistor is made from
85. A dynamometer wattmeter can be used for
86. An induction wattmeter can be used for
87. Basically a potentiometer is a device for
88. A potentiometer may be used for
89. When the two coil sides forming a coil are spaced exactly one pole pitch apart they are said to be of
90. Which of the following methods may be adopted to reduce the effects of armature reaction?
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