Question
A full-scale deflection of 90 is produced by a current of 10mA flowing through the moving coil of d.c instrument. Determine the value of
A full-scale deflection of 90 is produced by a current of 10mA flowing through the moving coil of d.c instrument. Determine the value of the shunt resistance required to produce full-scale deflection with 12mA, the resistance of the coil and springs being 1.22. The constant of the control spring is 3x20 N-m/rad and the moment of inertia of the coil is 4x10" kg-m . Assuming that the shunt produces the only available magnetic damping and that air damping is negligible derive an expression for, and determine the value of, the periodic time of the coil system. Calculate the ratio of the amplitude of consecutive swings. os enieys (000)
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Electric Machinery
Authors: Charles Kingsley, Jr, Stephen D. Umans
6th Edition
71230106, 9780073660097, 73660094, 978-0071230100
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