A ____ type of motor shaft has threads on the end of the shaft, and is used on uni-directional motors for special applications such as driving impeller of jet pumps.

A) flat
B) key
C) round
D) threaded

Impeller

A rotating component of a pump, blower, or compressor designed to move fluid by converting rotational energy into fluid flow.

Jet Pumps

Mechanical devices that use a high velocity jet of fluid to entrain a lower pressure fluid and raise its pressure.

Uni-directional

Capable of moving or operating in only one direction, often used in reference to devices or mechanical components.