Q2: Find out the sufficient answer with a brief explanation of the reason? write fomula if it found? 1. The power factor of a squirrel cage induction motoris low at light load only? 2. In a 3-phase induction motors the maximum torque does not depend on r2? 3. How to change the slip at which maximumtorque occurs? 4. What is the effect of increasing the length of the air gap in aninduction motor?

Q2: Find out the sufficient answer with a brief explanation of the reason? write fomula if it found? 1. The power factor of a squirrel cage induction motoris low at light load only? 2. In a 3-phase induction motors the maximum torque does not depend on r2? 3. How to change the slip at which maximumtorque occurs? 4. What is the effect of increasing the length of the air gap in aninduction motor?

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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Concept explainers

Three Phase Induction Motor

The induction motor is an electric motor that runs on AC (alternating current) and it is of two type single phase motor that work on single-phase power supply and three-phase motor that work on three-phase power supply.

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Q2: a Find out the sufficient answer with a brief explanation of the reason? write fomula if
it found?
1. The power factor of a squirrel cage induction motor is low at light load only?
2. Ina3-phase induction motors the maximum torque does not depend onr2?
3. How to change the slip at which maximumtorque occurs?
4. What is the effect of increasing the length ofthe air gap in aninduction motor?

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Q3. (a) For a three-phase squirrel-cage induction motor (SCIM), explain: (i) Why is the motor efficiency relatively low at light and heavy loads? (ii) Under what condition that the motor has the maximum efficiency?
A) At what percentage of slip is the pull-out or breakdown torque of a typical 3-phase squirrel- cage induction motor reached? 21. a) 3% slip b) 10% slip c) 20% slip d) none of the above B) If load is increased beyond the breakdown torque, what happens to the speed of the motor? a) it stops b) it may speed up beyond its rated rpm c) its speed will not change, but its current will go down d) none of the above
When the speed of the dc motor is varied by changing the armature resistance, is to be held constant. O field flux O applied voltage O load current O armature current The starting torque of a three phase slip ring induction motor is to a three phase squirrel cage induction motor. when compared O very low O low same O high
Single phase induction motors are not self-starting. For self- starting purpose we are adding many components with it. One of the components is a starting winding which will be disconnected when the motor reaches about full operating speed. State the necessity of this winding and what would happen if the start switch, capacitor, or start winding fail to open?