Answered: machine, what should be the case if it…

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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a.In a dc shunt motor, the shunt field resistance is 100 ohms and the armature resistance is 0.01 ohm. It is supplied by a 250V source. If the shunt field is disconnected and is connected to a rheostat to control the speed of the dc machine, what should be the case if it is desired to increase the speed of the motor?

-The resistance of the field rheostat should be decreased to be able to increase the speed of the motor

-The resistance of the field rheostat should be increased to be able to increase the speed of the motor

-The resistance of the field rheostat should not be changed to be able to increase the speed of the motor

-The terminals of the field rheostat should be short circuited to be able to increase the speed of the motor

b. In a dc shunt machine, reversing the terminals of the brushes will make the rotation of the shaft to rotate in other direction (e.g. from clockwise to counter-clockwise). Is it TRUE OR FALSE?

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