Oilers/Plant Tenders (HHC) Civil Service Practice Exam

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In a piston-type pump, where does the plunger move?

In a bored cylinder
In an external housing
In a packing gland
In a diaphragm chamber

The correct answer is: In a packing gland

The plunger in a piston-type pump moves in a bored cylinder. This is because the design of a piston pump involves a cylindrical chamber where the piston or plunger is inserted. As the plunger moves back and forth within this bored cylinder, it creates a change in volume that helps in drawing in and expelling the fluid being pumped. The motion of the plunger, driven by the crank and drive mechanism of the pump, is essential for the pumping action. In contrast, while a packing gland does play a role in sealing the opening around the piston to prevent leaks, it is not the area in which the plunger itself moves. It serves to provide a seal rather than the motion path. An external housing may encase the entire pump but does not define the area of plunger movement. Similarly, a diaphragm chamber is characteristic of diaphragm pumps, not piston-type pumps, which specifically utilize a plunger moving within a cylinder for fluid transfer.