Which of the following is a possible cause for a motor to overheat?

Overheating in a motor can stem from several factors, each contributing to increased thermal conditions that exceed the motor's design limits.

The incorrect voltage supply is a critical factor; if the motor receives too high of a voltage, it can draw excessive current, leading to overheating. Conversely, if the voltage is too low, the motor may not operate efficiently, causing it to work harder and generate excess heat.

Improper mechanical load also plays a significant role. If the motor is subjected to a load that it cannot handle, whether due to excessive friction, blockage, or overload, it will need to exert more effort to perform its task, causing additional heat buildup. The motor may also stall or operate inefficiently, further exacerbating the heating issue.

Additionally, while a failed ignition coil mainly pertains to combustion engines, if considered in a broader context of motor operation, it could lead to symptoms such as misfiring or erratic performance that might indirectly contribute to abnormal heating patterns in hybrid systems.

Therefore, acknowledging that all these factors can contribute to a motor's overheating illustrates the complexity of motor systems and highlights the importance of regular maintenance and correct operational practices to ensure optimal performance and longevity.