An uneven air gap in the stator and the rotor of a squirrel cage induction motor will lead to ______ during operation.

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  1. increased vibrations
  2. increased speed
  3. increased torque
  4. increased current

Answer (Detailed Solution Below)

Option 1 : increased vibrations
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An uneven air gap in the stator and the rotor of a squirrel cage induction motor will lead to:

  1. Increased vibrations:

    This is correct. An uneven air gap causes an imbalance in the magnetic field distribution, leading to mechanical vibrations during operation. These vibrations can cause noise, wear and tear, and potentially shorten the lifespan of the motor.

  2. Increased speed:

    This is incorrect. The speed of an induction motor is primarily determined by the supply frequency and the number of poles in the motor. An uneven air gap does not affect these factors directly.

  3. Increased torque:

    This is incorrect. While an uneven air gap can affect torque production, it typically leads to inconsistent torque rather than an increase.

  4. Increased current:

    This can be partially correct as well. An uneven air gap can cause unbalanced magnetic forces, which can lead to additional losses and increased current in some situations, but it is not the primary effect.

Conclusion:

An uneven air gap in the stator and the rotor of a squirrel cage induction motor will lead to:

1) Increased vibrations

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