61. Which of the following methods is most accurate ?
62. ________ has a lowrelative permeability and is used principally in field frames when cost is of primary importance and extra weight is not objectionable.
63. ________ is the common method of applying brushes to the commntator.
64. Yokes with rectangular cross-section are used for
65. Which of the following meters are not used on D.C. circuits
66. Power transformers have rating
67. Which of the following is the basic consideration in the design of insulation ?
68. For measuring a very high resistance we should use
69. Commonly used instruments in power system measurement are
70. Is universally used for windings of electrical machines because it is easily workable without any possibility of
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