that improp.1. Ismore than the dec ease in current due to inerExample 34.7. A 3-phase, 400-V, star-connected induction motor has a star-connected rotorwith a stator to rotor turn ratio of 6.5. The rotor resistance and standstill reactance per phase are0.05 and 0.25 Q respectively. What should be the value of external resistance per phase to beinserted in the rotor circuit to obtain maximum torque at starting and what will be rotor startingcurrent with this resistance?

To determine the value of the external resistance per phase to be inserted in the rotor circuit to…

Answered: that impro p.1. Is more than the dec…

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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6- Which of the following supply is given to the rotor winding of 3-Phase Induction Motor: a) DC Supply b) AC Supply c) No Supply d) Pulsating Supply 7- 3-Phase Induction Motor will have Starting Torque and Starting Current a) High, High b) Low, Low. c) High, Low d) Low, High 8- Which of the following method is used for controlling the speed of an induction motor: a) Changing number of stator poles b) Supply voltage control c) Frequency control d) All the options are correct 9- Which of the following method cannot be used for starting of 3-Phase Squirrel Induction Motor: a) Star-Delta Starting b) Line resistor startling c) transformer Starter d) Rotor Resistance Starting 10- The rotor of a stepper motor has no: a) windings b) commutator c) brushes d) all of the above

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