Which of the following pumps would usually be classified as non-positive displacement?

A) plunger
B) wobble plate
C) gear
D) engine coolant pump

Non-Positive Displacement

A type of pump or motor wherein the fluid or gas flow rate does not have a direct correlation with the speed of the moving parts, allowing for variable output.

Engine Coolant Pump

A pump, also known as a water pump, that circulates coolant through an engine's cooling system to regulate its temperature and prevent overheating.

Plunger

A device that uses a movable rod to create suction or pressure, commonly used in pumps, valves, and hydraulic systems.