B/ Fill in the blanks: 1- In a three-phase induction motor iron losses in stator will be .. that in rotor. 2- In three-phase induction motors sometimes copper bars are placed deep in the rotor to.... 3- Blocked rotor test on induction motors is used to find out. B..., Rre, K. 4- The maximum torque in an induction motor depends onV..., ...and... ..... .....

B/ Fill in the blanks: 1- In a three-phase induction motor iron losses in stator will be .. that in rotor. 2- In three-phase induction motors sometimes copper bars are placed deep in the rotor to.... 3- Blocked rotor test on induction motors is used to find out. B..., Rre, K. 4- The maximum torque in an induction motor depends onV..., ...and... ..... .....

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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Similar questions

A 200 V D.C. shunt motor takes 20 A at rated voltage and runs at 1000 r.p.m. Itsarmature resistance is 0.1 ohm. Calculate the value of additional resistance requiredin the armature circuit to reduced the speed to 800 r.p.m when the load torque isindependent of the speed.Ignore the field current. (Ans.1.98 ohm)
A 3-phase induction motor has a star-connected rotor. The rotor e.m.f. at standstill is 50V. The rotor resistance and standstill reactance are 0.5 2 and 3 Q respectively. Find the rotor current per phase and rotor power factor at starting.
Induct.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?
Q2. A 230 V single-phase induction motor, 50 Hz, has the following winding impedances (at rest): Zm=28 <70° Q. Za=42 <45°Q A) Calculate the input current at start-up. B) Obtain the amount of capacitor in series with the auxiliary winding for which the torque Maximum startup. Then compare the input current, auxiliary winding current and torque all at start-up in two modes with and without starter capacitor.
1.
Question A 3-phase, 415 V, 4-pole, 50 Hz induction motor draws 5 times the rated current at rated voltage at starting. It is required to bring down the starting current from the supply to 2 times of the rated current using a 3-phase autotransformer. If the magnetizing impedance of the induction motor and no-load current of the autotransformer is neglected, then the transformation ratio of the autotransformer is given by
7. The total rotational losses of an induction motor are a combination of ------- A) Friction losses B) Windage losses. D) Stray losses. C) Core losses. 8. The developed mechanical power can be calculated using the equation of- A) PAG - PRCL. B) PAG w sync C) (1-s) PAG. D) 3 E2Gc. 9. For an induction motor, if the synchronous speed is 1800 r/m, and the rotor speed 180rad/sec, then the slip will be: A) 5.5% C) 6% B) 4.5% D) 4% 10. The power losses in the stator part of the induction motor are B) Core losses D) Friction and windage losses A) Stator copper losses C) Air-gap losses
A 500 V DC shunt motor takes 4 A at no-load. The shunt field winding resistance and the armature winding resistance are 250 and 0.2 respectively. Find the efficiency when the motor draws a current of 10 A at full load.
A 3 phase, 1500 rpm, 2200 V, star connected synchronous motor has an impedance of 0.4+j90 per phase. At some excitation 2900 V is induced in the armature. Find the maximum torque developed by motor before the motor breaks out of synchronism. Also find the load angle this time.