Question:
The external rotor resistance of a 3-\(\phi\) induction motor is increased more than the resistance required to get maximum starting torque. Then maximum torque occurs in \underline{\hspace{2cm} of Torque (y-axis) – Speed (x-axis) characteristic plot.
The external rotor resistance of a 3-\(\phi\) induction motor is increased more than the resistance required to get maximum starting torque. Then maximum torque occurs in \underline{\hspace{2cm} of Torque (y-axis) – Speed (x-axis) characteristic plot.
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Torque-speed curves shift left with increased rotor resistance, especially during braking (2nd quadrant).
Updated On: May 23, 2025
- Second Quadrant
- Third Quadrant
- Fourth Quadrant
- First Quadrant
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The Correct Option is A
Solution and Explanation
If the rotor resistance is increased beyond the optimum value, the point of maximum torque shifts to a higher slip (lower speed). For a braking or plugging condition, torque vs speed enters the negative direction — represented in the second quadrant.
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