A moving coil mili voltmeter has a resistance of 20 ohm and full scale deflection of 120 degrees is reaches when the p.d of 100V is applied across it's terminals. The moving coil has effective dimensions of 3.1cm x2.6cm and wound with 120 turns. The flux density in the air gap is 0.15 Weber per meter squared. Determine the control constant of the spring and suitable diameter of copper wire for a coil winding if 55% of the total instrument resistance is due to coil winding given resistivity of 1.73*10-8 ohm meter
A moving coil mili voltmeter has a resistance of 20 ohm and full scale deflection of 120 degrees is reaches when the p.d of 100V is applied across it's terminals. The moving coil has effective dimensions of 3.1cm x2.6cm and wound with 120 turns. The flux density in the air gap is 0.15 Weber per meter squared. Determine the control constant of the spring and suitable diameter of copper wire for a coil winding if 55% of the total instrument resistance is due to coil winding given resistivity of 1.73*10-8 ohm meter
Electricity for Refrigeration, Heating, and Air Conditioning (MindTap Course List)
10th Edition
ISBN:9781337399128
Author:Russell E. Smith
Publisher:Russell E. Smith
Chapter8: Basic Electric Motors
Section: Chapter Questions
Problem 3RQ
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- A moving coil mili voltmeter has a resistance of 20 ohm and full scale deflection of 120 degrees is reaches when the p.d of 100V is applied across it's terminals. The moving coil has effective dimensions of 3.1cm x2.6cm and wound with 120 turns. The flux density in the air gap is 0.15 Weber per meter squared. Determine the control constant of the spring and suitable diameter of copper wire for a coil winding if 55% of the total instrument resistance is due to coil winding given resistivity of 1.73*10-8 ohm meter
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