21. In a 3-phase power measurement by two wattmeter method the reading of one of the wattmeter was zero. The power factor of the load must be
22. Wattmeter cannot be designed on the principle of
23. To measure a resistance with the help of a potentiometer it is
24. A Weston synchronoscope is a
25. The density of hydrogen is _____ times the density of air.
26. In D.C. machines the width of the duct is usually
27. The efficiency of a machine should be as ______ as possible to reduce the operating cost.
28. Which of the following methods is used for air cooling of turbo-alternators ?
29. In a Weston frequency meter, the magnetic axes of the two fixed coils are
30. A practical formula for determining the thickness of insulation between low voltage and high voltage windings is
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