When a DC cummulative compound wound motor is loaded
A. Torque increase and speed decrease.
B. Torque and speed both increase.
C. Torque decrease and speed increases.
D. Both torque and speed decrease.
Answer: A
Share your understanding of this question with the correct explanation.
When a DC cumulative compound wound motor is loaded, the torque increases and the speed decreases.
A cumulative compound wound motor is a type of DC motor that has both a series field winding and a shunt field winding. The series field winding provides additional torque at startup and during heavy loads, while the shunt field winding provides speed regulation.
When a cumulative compound wound motor is loaded, the increased mechanical load on the motor requires more torque to maintain the desired speed. As a result, the torque produced by the motor increases to meet the load requirements.
However, due to the increased load, the motor experiences a decrease in speed. The decrease in speed is a consequence of the increased torque demand exceeding the motor’s ability to maintain the original speed.
Therefore, the correct answer is A: Torque increases and speed decreases. When a DC cumulative compound wound motor is loaded, the torque increases while the speed decreases.