IESL Part II Electrical Practice Questions - IESL Qualifying Examination Part II - Electrical Engineering Exam

For a three-phase induction motor, how does the maximum torque developed relate to the rotor resistance (R2) per phase?

The maximum torque is directly proportional to R2. The maximum torque is inversely proportional to R2. The maximum torque is independent of R2, but the slip at which it occurs is directly proportional to R2. The maximum torque is independent of R2, and the slip at which it occurs is inversely proportional to R2.

Correct Answer:

The maximum torque is independent of R2, but the slip at which it occurs is directly proportional to R2.

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