[amp_mcq option1=”pulling the motor directly on line without a starter” option2=”locking of rotor due to harmonics” option3=”starting the motor on load which is more than the rated load” option4=”interchanging two supply phases for quick stopping” correct=”option4″]
The correct answer is D. interchanging two supply phases for quick stopping.
Plugging is a method of stopping a three-phase induction motor quickly. It is done by interchanging two of the supply phases. This causes the motor to rotate in the opposite direction, which quickly brings it to a stop.
Option A is incorrect because pulling the motor directly on line without a starter can damage the motor.
Option B is incorrect because locking of rotor due to harmonics is a condition that can cause the motor to overheat and stop.
Option C is incorrect because starting the motor on load which is more than the rated load can also damage the motor.