61. The resistance in the circuit of the moving coil of a dynamometer wattmeter should be
62. The scale of a rectifier instrument is
63. The spring material used in a spring control device should have the following property.
64. The stator of phase shifting transformer for use in conjunction with an A.C. potentiometer usually has a
65. The switch board instruments
66. The two pressure coils of a single phase power factor meter have
67. The use of...............instruments is merely confined within laboratories as stand¬ardizing instruments
68. To avoid the effect of stray magnetic field in A.C. bridges we can use
69. To measure a resistance with the help of a potentiometer it is
70. To measure an A. C. voltage by using an A.C. potentiometer, it is desirable that the supplyfor the potentiometer in taken
71. To measure radio frequency, the suitable frequency meter is
72. Two holes in the disc of energymeter are drilled at the opposite sides of the spindle to
73. Various adjustments in an energy meter include
74. Volt box is a component to
75. Wagner earthing device is used to eliminate errors due to
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