Answered: The field coil of a D.C. motor is…

Introductory Circuit Analysis (13th Edition)

13th Edition

ISBN:9780133923605

Author:Robert L. Boylestad

Publisher:Robert L. Boylestad

Chapter1: Introduction

Section: Chapter Questions

Problem 1P: Visit your local library (at school or home) and describe the extent to which it provides literature...

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The field coil of a D.C. motor is shunted by a 200Ω arc-quenching resistor as shown below: Need help with sub part D & E.

A)Explain what happens in the circuit when the supply is switched off,

B)Calculate the total current supplied to the circuit 0.5 seconds after switching on

C)Calculate the peak voltage V_AB at the instant the supply is switched off (assuming steady state conditions have been achieved before switching off)

D)Calculate the time taken for the coil current to fall to 10% of its normal running value after the supply is switched off (assuming steady state conditions have been achieved before switching off)

E)Explain the effects upon the circuit if the arc quenching resistor was replaced with a 100Ω resistor

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