The type of single-phase motor most likely to be used to drive a refrigerant compressor is a ____.

The type of single-phase motor most likely used to drive a refrigerant compressor is the capacitor-start, capacitor-run motor. This motor is particularly suited for applications requiring high starting torque, which is essential for compressors that need to overcome resistance when starting up.

Capacitor-start, capacitor-run motors have two capacitors—one for starting and one for running. The start capacitor provides a significant boost of power during the initial phase to help initiate the motor's movement. Once the motor reaches a certain speed, the start capacitor is disconnected, and the run capacitor maintains efficiency during operation. This design features a good balance of starting torque, running efficiency, and performance stability, making it ideal for the demanding conditions faced by refrigerant compressors in HVAC systems.

In contrast, shaded pole motors are not generally used for high-torque applications like compressors, as they have lower starting torque. Permanent split capacitor motors offer moderate starting torque but may not provide the initial boost necessary for refrigerant compressors. Resistance start motors are also not efficient for applications requiring significant torque, as they use resistors to limit the current during startup, which can lead to reduced efficiency and performance. Thus, the capacitor-start, capacitor-run motor stands out as the most suitable choice for powering refrigerant compressors in