In induction motor when the length of the air gap is increased, the magnetizing current of the motor increases while the short circuit current __________________.
A. increased.
B. decreased.
C. kept constant to certain value.
D. remains unchanged.
Answer: D
Share your understanding of this question with the correct explanation.
In an induction motor, when the length of the air gap is increased, the magnetizing current of the motor increases. This is because the increased air gap length results in a larger magnetic reluctance, requiring more magnetizing current to establish the magnetic field.
However, the short-circuit current of the motor remains unchanged. The short-circuit current is determined by the characteristics of the motor’s rotor and the applied voltage. Increasing the air gap length does not directly affect the short-circuit current.
Therefore, the correct answer is D. The short-circuit current remains unchanged.