Q2. Answer the following brietfy: 1. Consider the DC motor section shown in Fig. 1. Its field magnets are excited and its armature conductors are supplied with current from the supply mains. Redraw Fig. 1 showing the direction of the rotation. Suggest one way to reverse the direction of armature's rotation. 2. Give two differences between the characteristics of Shunt and Series Motors. 3. Which motor is preferred for driving a load that totally and suddenly thrown off without any fear of excessive speed resulting? (Series motor or shunt motor) and why? 4. Classify the DC generators. 5. A DC generator supplies 20kw, with an efficiency of 87%, find the total copper loss if the stray loss is 1400W. Armature Fig. 1

Q2. Answer the following brietfy: 1. Consider the DC motor section shown in Fig. 1. Its field magnets are excited and its armature conductors are supplied with current from the supply mains. Redraw Fig. 1 showing the direction of the rotation. Suggest one way to reverse the direction of armature's rotation. 2. Give two differences between the characteristics of Shunt and Series Motors. 3. Which motor is preferred for driving a load that totally and suddenly thrown off without any fear of excessive speed resulting? (Series motor or shunt motor) and why? 4. Classify the DC generators. 5. A DC generator supplies 20kw, with an efficiency of 87%, find the total copper loss if the stray loss is 1400W. Armature Fig. 1

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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