21. A Weston frequency meter is
22. A _____ device prevents the oscillation of the moving system and enables the latter to reach its final position quickly
23. In D.C. machines, the ________ in field mmf results in increase in size and cost of machines.
24. For measurement of mutual inductance we can use
25. In a low power factor wattmeter the compensating coil is connected
26. Which of the following devices may be used for extending the range of instruments ?
27. The operating voltage of a meggar is about
28. Which of the following brushes can be used for high values of current density ?
29. Which of the following is an advantage of hydrogen cooling?
30. The insulation between windings and grounded core and the insulation between the windings of the same phase is
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