Which of the following is a common technique to prevent overheating in motors?

Using thermal cut-outs and good ventilation is a common technique to prevent overheating in motors because these methods directly address the heat management issues that can arise during motor operation.

Thermal cut-outs function as safety devices that disconnect the power supply when the motor temperature exceeds a certain threshold. This helps to prevent damage from overheating, which can lead to insulation failure and ultimately motor burnout.

Good ventilation is equally crucial; it ensures that there is a continuous flow of air around the motor, dissipating heat generated during operation. Proper airflow helps maintain optimal operating temperatures, reducing the risk of overheating conditions that could negatively impact the motor's performance and lifespan.

In contrast, running motors at maximum capacity continuously can generate excessive heat that may not be manageable, leading to failures. Operating the motor without protective devices, such as thermal cut-outs, eliminates critical safeguards that could prevent overheating. Ignoring the power factor can also contribute to inefficiencies, which may result in additional heat generation, further exacerbating overheating issues. Therefore, utilizing thermal cut-outs and ensuring good ventilation are effective practices in maintaining motor health and performance.