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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?

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?

Delmar's Standard Textbook Of Electricity
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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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?
Transcribed Image Text: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?
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