Thanks 250-V, 350-A, separately excited de motor with an armature resistance of 0.05 ohm, anda field voltage 200V and a field resistance is 50 ohm. The no-load speed is 1200 rpm.1- Find the starting current.2- Find the no-load current.3- Find the speed of this motor when the line current is 250 A.4- For part 3, if the mechanical losses is 5kW find the efficiency of this motor.5- If we wish to limit the maximum starting current to twice its rated value, find themodified armature resistance?

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Introductory Circuit Analysis (13th Edition)

13th Edition

ISBN:9780133923605

Author:Robert L. Boylestad

Publisher:Robert L. Boylestad

Chapter1: Introduction

Section: Chapter Questions

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Question

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250-V, 350-A, separately excited de motor with an armature resistance of 0.05 ohm, and
a field voltage 200V and a field resistance is 50 ohm. The no-load speed is 1200 rpm.
1- Find the starting current.
2- Find the no-load current.
3- Find the speed of this motor when the line current is 250 A.
4- For part 3, if the mechanical losses is 5kW find the efficiency of this motor.
5- If we wish to limit the maximum starting current to twice its rated value, find the
modified armature resistance?

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