Correct option is C
Increasing the length of the air gap in an induction motor will increase the magnetizing current. So the answer is (c).
Explanation: A larger air gap increases the reluctance of the magnetic circuit, which means more current is needed to maintain the same magnetic flux, leading to a higher magnetizing current. This also results in a decrease in power factor.
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Magnetizing current increase: The primary effect is a significant rise in the magnetizing current.
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Power factor decrease: A larger air gap leads to a lower power factor.
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Air gap flux decrease: Although the motor tries to maintain the flux by increasing the magnetizing current, the actual air gap flux slightly decreases with a larger gap.
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Reduced torque: Increased air gap can lead to a reduction in the motor's maximum torque.
