Which of the following is NOT an application of a synchronous motor? 

The application that is NOT typically associated with a synchronous motor is: Dot matrix printer.

Explanation:

• Synchronous motors are commonly used in applications where precise control of speed and position is required, such as servo drives, high-speed compressors, and main line traction (in some cases).
• However, they are not commonly employed in dot matrix printers. Printers typically use different types of motors, such as stepper motors or DC motors, for their specific requirements in moving print heads and paper feeds.
• Synchronous motors are better suited for applications that demand constant speed and synchronization with the power supply frequency.