Which of the following statements about DC motors is accurate regarding starting torque?

Study for the 3rd Class Power Engineering (3A2) Exam. Explore multiple choice questions with hints and explanations. Prepare for your certification!

The statement that series motors provide high starting torque is accurate due to the design of how series DC motors operate. In a series motor, the field windings are connected in series with the armature windings. As a result, when the motor starts and the armature current is high, the current through the field windings also becomes high. This generates a strong magnetic field, which significantly enhances the torque produced at startup.

This characteristic of series motors makes them particularly suitable for applications requiring high starting torque, such as electric traction and cranes. The torque produced in a series motor increases with load, making it an effective choice for situations where initial force is essential.

Other types of DC motors, like shunt motors, have field windings connected in parallel to the armature, which means they maintain a relatively constant magnetic field regardless of the armature current. Consequently, shunt motors do not provide high starting torque, making them more suitable for applications needing consistency in speed rather than heavy startup force. The absence of a requirement for starting torque in DC motors is a misunderstanding, as most situations do involve a need for some amount of torque to overcome inertia at startup.

Subscribe

Get the latest from Examzify

You can unsubscribe at any time. Read our privacy policy