Which of the following is a characteristic of B-type motors in the NEMA classification?

B-type motors, as per the NEMA classification, are characterized specifically by their high starting torque. This feature makes them suitable for applications that require a significant amount of torque to start moving, such as in heavy machinery or equipment that encounters considerable resistance at startup. The high starting torque is essential in these scenarios to overcome inertia and ensure smooth operation when the motor is first activated.

In contrast, other types of motors classified by NEMA, such as A-type motors, typically exhibit lower starting torque, making them less suitable for heavy-load applications at startup. Options referring to constant torque or difficult starting do not align with the defining attributes of B-type motors and do not accurately describe their performance characteristics. Therefore, recognizing the significance of the high starting torque characteristic helps differentiate B-type motors from others and supports their selection for demanding electrical applications.