71. The efficiencies of transformers compared with that of electric motors of the same power are
72. The noise resulting from vibrations of laminations set by magnetic forces, is termed as
73. The power transformer is a constant
74. Sumpner's test is conducted on transformers to determine
75. For the parallel operation of single phase transformers it is necessary that they should have
76. In a transformer routine efficiency depends upon
77. No-load on a transformer is carried out to determine
78. The dielectric strength of transformer oil is expected to be
79. A transformer oil must be free from
80. Losses which occur in rotating electric machines and do not occur in trans formers are
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