(a) Explain the required tests to construct the circle diagram of the induction motor.The stator leakage impedance of a star connected induction motor is (0.5+j1.4) §per phase, and the rotor leakage impedance referred to stator is (0.6+j1.5) 2 perphase. Neglect the magnitizing current, estimate the line current and torque ifthe machine runs with a slip of 5 percent when connected to a 400V three phasesupply (i) normal operation, and (ii) with one line open.

Answered: Image /qna-images/answer/6ea7fce9-33d3-492a-80d7-e72c2b24b985.jpg

Answered: (a) Explain the required tests to…

Delmar's Standard Textbook Of Electricity

7th Edition

ISBN:9781337900348

Author:Stephen L. Herman

Publisher:Stephen L. Herman

Chapter35: Harmonics 916

Section: Chapter Questions

Problem 3RQ: Would a positive-rotating harmonic or a negative-rotating harmonic be more harmful to an induction...

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Name three factors that determine the torque produced by an induction motor.
6- In a stepper motor, how is the speed of rotation determined? a) By the current supplied to the motor. b) By the magnitude of the voltage applied. c) By the load applied to the motor. d) By the frequency of the waveforms used. 7- A transformer core is laminated to a) reduce hysteresis loss b) reduce eddy current losses c) reduce copper losses d) reduce all above losses 8- An induction motor with 580 r.p.m. speed at 60 Hz will have a) 8 poles b) 6 poles c) 4 poles d) 2 poles 9- If any two phases for an induction motor are interchanged a) the motor will run in reverse direction b) the motor will run at reduced speed c) the motor will not run d) the motor will burn 10- No-Load speed of which of the following motor will be highest? a) Shunt motor b) Series motor c) Short-Shunt compound motor d) Long-Shunt compound motor
The resistance and reactance per phase of the rotor of a 3-phase induction motor are 0.6 ohm and 5 ohms respectively. The induction motor has a star-connected rotor and when the stator is connected to a supply of normal voltage, the induced e.m.f. between the slip rings at standstill is 80 V. Calculate the current in each phase and the power factor at starting when (i) the slip-rings are shorted, (ii) slip-rings are connected to a star-connected resistance of 4 ohm per phase.
Examine the saddle torque of induction motors and the effect of different groove structures on the saddle torque.
Three Phase Induction Mot... The relative speed of stator magnetic field with respect to rotor of a 30 induction motor with 4 pole, 50 Hz frequency. If the slip is 0.05.
What is a single - phase induction motor? How does a single- phase induction motor work? How do you test a single phase motor? Which capacitor is used in single phase motor? What are the advantages of single phase induction motor? What are the applications of single phase induction motor? How does an induction motor start? What are the differences between single and three phase I.M ? What are the types of induction motor? What is the difference between induction motor and normal motor? Why three-phase induction motor self start while single phase motor does not self start?
A compound generator has a lap-wound armature with 200 slots and four turns per coil. It is rotating with a speed of 80 rpm and flux per pole is 100mWb. The armature resistance is 12 and shunt field resistance is 2002. The series field resistance is 22. Determine: (i) Terminal voltage (ii) If a load is connected to the terminals which starts pulling a load current such that the flux that is produced by the series field is added into the shunt field to keep the new induced voltage to be the same as the induced voltage at no load, what will be the new terminal voltage if the shunt field current is dropped to 90% of the shunt field current at no load? (iii) Power dissipated in the load Draw equivalent circuits
Briefly explain the following: 1- The starting torque for a three-phase squirrel cage induction motor is 1.5 to 2 times the full-load torque, and the starting current is 5 to 6 times the full-load current? 2- The frequencies of the rotor currents at starting and at full-load are different? 3- The alternators cannot be connected to a live busbar when they are at standstill? 4- The three phase induction machines often called "rotating transformer"? 5- The three phase induction motor can rotates in reverse direction if two lines of the supply voltage are exchanged? 6- The magnetizing and demagnetizing effects of the armature current in the synchronous motor?
4. Chorded windings are used in induction motors because theyA. have better mechanical characteristics.B. are made with less wire and are therefore cheaper.C. are made with smaller wire and are therefore cheaper.
Fill in all the blanks
IDENTIFY TWO WAYS IN WHICH THE OUTPUT POLARITY OF A SHUNT DC GENERATOR CAN BE CHANGED.
The amount of torque developed by a 3-phase squirrel-cage induction motor from no-load to rated-load is proportional to the amount of current flow through the rotor conductors. a) directly b) inversely If n

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