C) A 25 A electrodynamic ammeter is controlled by a spring having a constantof 5.7295x 10-6 Nm/rad. The full scale deflection is 110°. Determine theinductance of the instrument while measuring a current of 20 A. The mutualinductance at 0° deflection is 4 u H and the change in mutual inductance islinear with the deflection.

These instruments are also called transfer types of instruments because they are used to calibrating…

Answered: 106 Nm/rad. The full scale of the…

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106 Nm/rad. The full scale of the instrument while mea

Delmar's Standard Textbook Of Electricity

7th Edition

ISBN:9781337900348

Author:Stephen L. Herman

Publisher:Stephen L. Herman

Chapter26: Three-phase Circuits

Section: Chapter Questions

Problem 3PA: You are an electrician working in an industrial plant. A 30-hp three-phase induction motor has a...

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Question

C) A 25 A electrodynamic ammeter is controlled by a spring having a constant
of 5.7295x 10-6 Nm/rad. The full scale deflection is 110°. Determine the
inductance of the instrument while measuring a current of 20 A. The mutual
inductance at 0° deflection is 4 u H and the change in mutual inductance is
linear with the deflection.

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