Modern day residential oil burner motors operate at __________ RPM's.

The correct answer is that modern day residential oil burner motors typically operate at 3450 RPM. This speed is standard for many single-phase motors used in HVAC applications, including oil burners. The 3450 RPM designation indicates that these motors are designed to provide efficient operation and adequate power for tasks like fuel pumping and combustion air movement, ensuring effective heating performance in residential settings.

This operating speed aligns with the needs of oil burners, which require precise control and reliable performance to maintain efficient heating. Additionally, it is important to recognize the specific function of these motors, which often focus on high RPMs for tasks that need quick movement and responsiveness. Understanding this context helps clarify why this RPM is prevalent among residential oil burner motors.

In contrast, the other options represent typical RPMs for different types of motors. For example, 1750 RPM is common for larger, more robust motors that are often used in applications requiring lower speeds and higher torque. The 2800 RPM and 3600 RPM speeds are less common in residential oil burners and typically apply to specialized industrial or commercial applications. Knowing these distinctions is important for grasping the operational characteristics of various motors within the HVAC field.