61. In a Schering bridge the potential of the detector above earth potential is
62. Induction type single phase energy meters measure electric energy in
63. To measure radio frequency, the suitable frequency meter is
64. The cold rolled grain oriented steel has ______ permeability in the direction of the grain orientation.
65. Power transformers should be designed to have maximum efficiency
66. are used for construction of core of electromagnets.
67. For measurements on high voltage capacitors, the suitable bridge is
68. A moving-coil permanent-magnet instrument can be used as flux meter
69. In ______ machines, the size of the shaft is decided by the critical speed which depends on the deflection of the shaft.
70. is usually used for brush rockers
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