The use of double squirrel cage winding on the rotor provides
A. low noise.
B. reduced starting torque.
C. a large starting torque.
D. higher efficiency.
Answer: C
Share your understanding of this question with the correct explanation.
The use of a double squirrel cage winding on the rotor of an induction motor provides a large starting torque.
The double squirrel cage winding consists of two sets of rotor bars: an outer set and an inner set. The outer set has high resistance and low reactance, while the inner set has low resistance and high reactance. This configuration allows the motor to have a high starting torque while maintaining good running characteristics.
During starting, a large portion of the current flows through the outer set of rotor bars, which have high resistance. This generates a high starting torque. As the motor reaches its operating speed, the current transfers to the inner set of rotor bars, which have lower resistance but higher reactance. This transition allows the motor to operate efficiently and with good running characteristics.
Therefore, option C, a large starting torque, is the correct answer.