TPC Basic Hydraulics Practice Test

In a hydraulic system, pressure is directly related to the resistance against fluid flow. When resistance to flow increases—such as through narrower pipes, blockages, or increased friction—the hydraulic system must work harder to maintain the fluid movement.

This requires an increase in the pressure of the hydraulic fluid to overcome the additional resistance. Therefore, as resistance increases, the fluid's pressure will also increase to ensure that the system continues to function effectively. This principle is fundamental in hydraulic systems, reflecting the relationship between flow, pressure, and resistance as described by Pascal's law and the principles of fluid dynamics.

A decrease in pressure would occur under conditions where resistance is lowered, while a stabilization of pressure could suggest a balanced system without changes in flow or load, which isn't the case when resistance increases. Fluctuations in pressure generally indicate variable demands or changes in system conditions, not a direct correlation with increased resistance. Thus, an increase in pressure is the correct response to rising resistance in a hydraulic system.