[amp_mcq option1=”decreases the rotor current” option2=”increases the rotor current” option3=”rotor current becomes zero” option4=”rotor current rernains same” correct=”option1″]
The correct answer is: A. decreases the rotor current.
When resistance is inserted in the rotor of an induction motor, the rotor current decreases. This is because the resistance in the rotor circuit causes a voltage drop, which reduces the current flowing through the rotor. The reduced current causes a decrease in the torque developed by the motor.
Option B is incorrect because the rotor current decreases, not increases.
Option C is incorrect because the rotor current does not become zero.
Option D is incorrect because the rotor current decreases, not remains the same.