21. A) At what percentage of slip is the pull-out or breakdown torque of a typical 3-phase squirrel-cage induction motor reached? a) 3% slip b) 10% slip c) 20% slip d) none of the above B) If load is increased beyond the breakdown torque, what happens to the speed of the motor? a) it stops b) it may speed up beyond its rated rpm c) its speed will not change, but its current will go down d) none of the above
21. A) At what percentage of slip is the pull-out or breakdown torque of a typical 3-phase squirrel-cage induction motor reached? a) 3% slip b) 10% slip c) 20% slip d) none of the above B) If load is increased beyond the breakdown torque, what happens to the speed of the motor? a) it stops b) it may speed up beyond its rated rpm c) its speed will not change, but its current will go down d) none of the above
Delmar's Standard Textbook Of Electricity
7th Edition
ISBN:9781337900348
Author:Stephen L. Herman
Publisher:Stephen L. Herman
Chapter32: Three-phase Motors
Section: Chapter Questions
Problem 6RQ: Name three factors that determine the torque produced by an induction motor.
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21. A) At what percentage of slip is the pull-out or breakdown torque of a typical 3-phase squirrel-cage induction motor reached?
a) 3% slip b) 10% slip c) 20% slip d) none of the above
B) If load is increased beyond the breakdown torque, what happens to the speed of the motor?
a) it stops
b) it may speed up beyond its rated rpm
c) its speed will not change, but its current will go down
d) none of the above
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