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A 230-v shunt motor running at 650 rpm has an armature current of 20A. The armature resistance is equal to 0.6 ohm .What resistance should be placed in series with the armature to reduce the speed to 550 rpm, the armature current unchanged?

A 230-v shunt motor running at 650 rpm has an armature current of 20A. The armature resistance is equal to 0.6 ohm .What resistance should be placed in series with the armature to reduce the speed to 550 rpm, the armature current unchanged?

Introductory Circuit Analysis (13th Edition)
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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1. A 230-v shunt motor running at 650 rpm has an armature current of 20A. The armature resistance is equal to 0.6 ohm .What resistance should be placed in series with the armature to reduce the speed to 550 rpm, the armature current unchanged? 2. A 5 Hp, 220-v, 1200 rpm shunt motor has armature circuit resistance of 0.175 ohm and a shunt field resistance of 460 ohms. If the stray losses amount to 305 watts, the motor efficiency is then equal to? 3. A 230-V dc shunt motor takes a current of 4A at no-load. The resistance of armature and field circuits are 0.50 ohm and 230 ohm , respectively. if the maximum efficiency occurs at full load current, what is the value of this current?
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