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Agricultural Mechanics 2 EOPA Practice Test

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In hydraulics, what does the unit PSI stand for?
Correct Answer:
Pounds per square inch
Explanation:
PSI is a unit of pressure, defined as pounds of force per square inch of area. In hydraulics, pressure measures how much push the fluid exerts on an area, and it’s what drives motion and force transfer through the system. The key relationship is F = P × A: the force a hydraulic component can achieve equals the pressure times its area. So, knowing the pressure in psi and the piston area lets you calculate the output force in pounds. For example, a piston with 2 square inches of area under 60 psi can exert 120 pounds of force. The other phrasings don’t fit because they either mix in a rate or a different quantity (power) rather than pressure.

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