Q. 1. Does change in excitation affect the synchronous motor speed ? Why Ans. No. Q. 2. The power factor ? Why Ans. Yes. Q. 3. How ? Ans. When over-excited, synchronous motor has leading power factor. However, when underexcited, it has lagging power factor. Q. 4. For what service are synchronous motors especially suited ? Ans. For high voltage service. Q. 5. Which has more efficiency; synchronous or induction motor ? Why Ans. Synchronous motor. Q. 6. Mention some specific applications of synchronous motor ? Ans. 1. constant speed load service 3. power factor correction 2. reciprocating compressor drives 4. voltage regulation of transmission lines.

Q. 1. Does change in excitation affect the synchronous motor speed ? Why Ans. No. Q. 2. The power factor ? Why Ans. Yes. Q. 3. How ? Ans. When over-excited, synchronous motor has leading power factor. However, when underexcited, it has lagging power factor. Q. 4. For what service are synchronous motors especially suited ? Ans. For high voltage service. Q. 5. Which has more efficiency; synchronous or induction motor ? Why Ans. Synchronous motor. Q. 6. Mention some specific applications of synchronous motor ? Ans. 1. constant speed load service 3. power factor correction 2. reciprocating compressor drives 4. voltage regulation of transmission lines.

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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Coulomb’s Law

Coulomb's law states that the attraction or repulsion force between two charged things is proportional to the product of their charges and inversely proportional to the square of their distance. It has an effect along the line that connects the two-point charges.

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Q. 1. Does change in excitation affect the synchronous motor speed ?
Why
Ans. No.
Q. 2. The power factor ? Why
Ans. Yes.
Q. 3. How ?
Ans. When over-excited, synchronous motor has leading power factor. However, when
underexcited, it has lagging power factor.
Q. 4. For what service are synchronous motors especially suited ?
Ans. For high voltage service.
Q. 5. Which has more efficiency; synchronous or induction motor ? Why
Ans. Synchronous motor.
Q. 6. Mention some specific applications of synchronous motor ?
Ans. 1. constant speed load service
3. power factor correction
2. reciprocating compressor drives
4. voltage regulation of transmission lines.

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