What may happen to a drive motor when the room temperature rises to +30°F and is then pulled back down to -10°F?

When the room temperature rises to +30°F and then drops to -10°F, the drive motor may experience an increase in amperage, which is reflected in the correct answer. This situation can lead to several physical and electrical changes affecting the drive motor's performance.

As the temperature increases, the viscosity of lubricants within the motor may become lower, which can allow for smoother operation at higher temperatures. However, as the temperature decreases dramatically, the viscosity may increase again, particularly if the internal components are not designed to handle such extreme temperature fluctuations. This can lead to the motor experiencing more mechanical resistance or load, resulting in the motor having to draw more electrical current (amps) to maintain its performance.

The increase in resistance or mechanical load can cause the motor to pull more amps as it compensates for the added strain. This higher amperage can potentially lead to overheating and reduced efficiency if the motor is not appropriately rated to handle such conditions. Thus, the correct answer highlights a significant concern regarding the impact of temperature fluctuations on drive motors, focusing particularly on their electrical performance under stress.