In the illustrated system, what pressure will be indicated on the gage if the load (x) is 9984 lbs (4532.7 kg) and the piston area is 12 sq. in (77.4 sq. cm)? See illustration GS-0062.
• Hydraulic systems transmit force through an incompressible fluid, so the pressure is the same throughout the system. • The basic pressure relationship: Pressure = Force ÷ Area (make sure force is in pounds and area in square inches for psi). • Gauge Z measures the system pressure needed to support the load X acting on piston area Y.
• Look at the piston on the right: what force is the fluid pushing with to hold up the 9984 lb load? • Once you know the force the fluid must exert, how do you convert that into pressure using the given piston area? • After you compute the pressure in psi, which answer choice is closest to your calculated value?
• Be sure you are using Force in pounds (lb) and Area in square inches (sq. in.) so your answer is in psi. • Confirm that you are using the piston area Y (12 sq. in.) and not the area of anything else in the picture. • Double-check your division: Pressure (psi) = Load (lb) ÷ Piston Area (sq. in.) before matching to the options.
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