Which of the following brushes can be used for high values of current density ?

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The design of mechanical parts is particularly important in case of __________ speed machines?

A. low B. medium C. high D. any of the above...

The noise produced by a ___________ cooled machine is less as the rotor moves in a medium of smaller density?

A. air B. hydrogen C. either A. or B. D. none of the above...

Power transformers should be designed to have maximum efficiency________________?

A. at one-fourth load B. at one-half load C. at or near full load D. any of the above...

In a D.C. machine the current per brush arm should not be more than_____________?

A. 100 A B. 200 A E. 300 A D. 400 A...

A practical formula for determining the thickness of insulation between low voltage and high voltage windings is__________________?

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