What type of air compressor is categorized as dynamic?

Dynamic air compressors are characterized by their method of operation, which typically involves the continuous flow of air. These compressors work on principles of airflow and velocity, manipulating air to achieve compression primarily through kinetic energy rather than trapped volume.

In the context of the choices provided, dynamic compressors include types such as centrifugal and axial compressors. These designs utilize high-speed rotating elements to impart velocity to the air, which is then converted into pressure. The term "one of the various types" correctly captures this broader classification and includes any other dynamic type that may not be specifically listed in the choices.

The other types listed—positive displacement, reciprocating, and rotary screw—are all classified as positive displacement compressors. They work by mechanically trapping a volume of air and reducing that volume to increase pressure, thus they do not fall under the dynamic category. Understanding the fundamentals of compressor types helps in determining suitable applications in power engineering and industrial settings.