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

The choice of a capacitor-start, capacitor-run motor for driving a refrigerant compressor is primarily based on its ability to provide high starting torque and operate efficiently under varying load conditions.

Capacitor-start, capacitor-run motors are designed with a capacitor that helps improve the starting torque significantly compared to other types of single-phase motors. This high starting torque is essential for compressor applications, as starting these motors under full load can be challenging without the additional initial power provided by the capacitor.

Once the motor has started, the capacitor remains connected, improving the efficiency of the motor throughout its running phase, which is crucial for systems that require continuous and reliable operation, such as HVAC refrigeration systems. The ability to maintain efficiency while providing adequate power to compress refrigerant makes this type of motor well-suited for the task.

In contrast, other motor types, like split-phase motors and shaded-pole motors, may not provide the necessary starting torque or operational efficiency required in refrigeration applications. Permanent split capacitor motors, while similar to the selected option, are typically used in applications where high starting torque is not as critical. Therefore, the capacitor-start, capacitor-run design stands out as the most appropriate choice for driving refrigerant compressors.