a. Explain autotransformer starting method and wye-delta starting method of 3-Dinduction motor with necessary circuit diagram.7b. Discuss built-in undervoltage and overload protection of 3-O induction motorwith neat sketch.c. A 3-0, 6-pole, 460V, 60HZ induction motor rated at 15hp is running at1185rpm. The equivalent circuit has the following parameters (in ohms/phase):R¡=0.22, R2=0.252, X1=1.2 N, X=1.29 N, Rc=317 2, Xm=42 2i)Sketch the per phase equivalent circuit of the induction motor (with respect tostator)ii)Calculate slip and rotor frequencyiii) Stator current and total stator copper loss.

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Answered: 7 a. Explain autotransformer starting…

7 a. Explain autotransformer starting method and wye-delta starting method of 3-D induction motor with necessary circuit diagram. b. Discuss built-in

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. What is the formula for torque production in a single-phase induction motor? Draw a vector diagram for capacitor start single-phase induction motor.2. Which type of starter is popular for using in induction motor and why?
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d) A 2-pole induction motor is fed with a 230 V, 50 Hz supply and is running at no load. i. Calculate its angular speed in rpm. ii. Explain how can we slow down the speed of the motor above, at no load? iii. Explain what will happen to the speed of the motor if we slowly add amechanical load to the motor.
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?
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