Correct option is A
Explanation:
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Power Factor Reduction: Increasing the air gap in a three-phase induction motor generally leads to a decrease in the motor's power factor. A larger air gap increases the reactance of the motor, which results in a lower power factor due to a higher proportion of reactive power compared to active power.
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Efficiency: Increasing the air gap typically decreases the efficiency of the motor because it reduces the magnetic coupling between the stator and rotor, leading to higher losses.
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Speed: The speed of a three-phase induction motor is primarily determined by the supply frequency and the number of poles. Increasing the air gap does not significantly affect the synchronous speed of the motor.
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Breakdown: The term "breakdown" is not applicable in this context. An increased air gap can lead to reduced performance but not directly to a breakdown in operation.
