Which point or region represents the Pull-out Torque in the shown torque-speed characteristic of a 3-phase induction motor? 
Point c
The torque-speed characteristic of a 3-phase induction motor typically shows how torque varies with speed. The Pull-out Torque, also known as the Breakdown Torque, indicates the maximum torque that the motor can develop without stalling.
In the provided torque-speed curve:
- Point a: This represents a point where torque begins to rise from starting conditions. It's not the maximum torque point.
- Point b: This point is generally where the motor could operate efficiently under normal conditions. It's not where the maximum torque occurs either.
- Point c: This is where the torque reaches its highest value, i.e., the maximum or Pull-out Torque, before decreasing as the speed approaches synchronous speed.
Based on the characteristic curve:
- Conclusion: Point c clearly represents the Pull-out Torque, as it is the peak point of the torque-speed curve, indicating the maximum torque the motor can develop before losing its capability to increase speed. Thus, the correct answer is Point c.
Similar Questions
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Which set of statements correctly describes the steady state speed-torque characteristics of a three-phase synchronous motor?
i) Runs at constant synchronous speed
ii) Starting torque is zero
iii) Torque increases significantly with slip
iv) Not suitable for variable speed drives
v) Maintains speed under varying loads
The speed of a synchronous motor depends on:
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Field failure protection in an alternator is provided to detect:
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Synchronous motor when used for power factor improvement should be-
In an alternator, the _______ current is generated in the stationary stator.
The speed with which the turbo alternators operate are-
