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Sample IFPS CFPS Practice Questions
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1Pascal's law states that pressure applied to a confined fluid is transmitted in which manner?
A.Only in the direction of the applied force
B.With diminishing force as distance from the source increases
C.Undiminished in all directions and acts with equal force on equal areas
D.Only along the path of least resistance
Explanation: Pascal's law is the foundation of hydraulics: pressure applied to a confined fluid is transmitted undiminished in all directions and acts with equal force on equal areas, at right angles to the surfaces. This allows small input forces to produce large output forces through area differences.
2A hydraulic cylinder has a bore area of 4 square inches and operates at 2,000 psi. What force does the cylinder produce on extension?
A.500 lb
B.8,000 lb
C.2,004 lb
D.16,000 lb
Explanation: Force equals pressure times area: F = P x A = 2,000 psi x 4 in² = 8,000 lb. The full bore area is used during extension because pressure acts on the entire piston face.
3In a hydraulic system, what is the primary purpose of a relief valve?
A.To increase flow rate to the actuator
B.To reverse the direction of cylinder travel
C.To filter contamination from the fluid
D.To limit maximum system pressure and protect components from overload
Explanation: A relief valve is a normally closed pressure-control valve that limits maximum system pressure. When pressure reaches the valve setting, it opens and diverts excess flow to the reservoir, protecting the pump, hoses, and components from damaging overload.
4What is the hydraulic horsepower delivered by a system flowing 10 gpm at 1,714 psi?
A.17 hp
B.10 hp
C.100 hp
D.1 hp
Explanation: Hydraulic horsepower = (psi x gpm) / 1714 = (1,714 x 10) / 1714 = 10 hp. The constant 1714 converts psi and gpm into horsepower units. This formula gives the theoretical fluid power without accounting for efficiency.
5Which type of hydraulic pump is generally capable of the highest operating pressures?
A.Gear pump
B.Piston pump
C.Vane pump
D.Centrifugal pump
Explanation: Piston pumps achieve the highest pressures (commonly 3,000-6,000 psi and beyond) because their close-tolerance pistons and bores seal effectively against high pressure. Gear and vane pumps are typically limited to lower and moderate pressures respectively.
6An ISO 4406 cleanliness code is expressed as three numbers such as 18/16/13. What do these numbers represent?
A.Viscosity at three temperatures
B.Pressure ratings in three zones
C.Particle counts at 4, 6, and 14 microns
D.Flow rates in three circuit branches
Explanation: ISO 4406 expresses fluid cleanliness as three range codes corresponding to the number of particles per milliliter greater than or equal to 4, 6, and 14 microns respectively. The scale is logarithmic, so each code increase roughly doubles the particle count.
7In a pneumatic FRL unit, what does the lubricator perform?
A.Removes water and solid particles from the air
B.Injects a fine oil mist into the air stream to lubricate downstream components
C.Reduces and stabilizes the air supply pressure
D.Increases the air flow velocity
Explanation: In an FRL (Filter-Regulator-Lubricator), the lubricator injects a controlled oil aerosol into the compressed air stream. This mist lubricates valves, cylinders, and air motors downstream, reducing wear and extending component life.
8A hydraulic cylinder with a 3-square-inch bore receives 6 gpm of flow. Approximately what is the piston extension speed in inches per minute? (1 gallon = 231 cubic inches)
A.18 in/min
B.1,386 in/min
C.462 in/min
D.77 in/min
Explanation: Volumetric flow = 6 gpm x 231 in³/gal = 1,386 in³/min. Speed = flow / area = 1,386 / 3 = 462 in/min. Cylinder speed is inversely proportional to piston area for a given flow.
9What is the function of a hydraulic accumulator?
A.To convert hydraulic energy into rotary motion
B.To meter the flow to a directional valve
C.To cool the hydraulic fluid
D.To store hydraulic energy under pressure for later use
Explanation: An accumulator stores fluid under pressure (commonly using a compressed gas charge) and releases it on demand. It supplements pump flow, absorbs shock and pulsations, maintains pressure during leakage, and provides emergency power.
10On an ISO 1219 schematic, a directional control valve described as '4/3' indicates what?
A.Four positions and three ports
B.Four bar pressure and three liters flow
C.Four ports and three positions
D.Four cylinders served by three pumps
Explanation: In ISO 1219 nomenclature, the first number is the number of ports and the second is the number of switching positions. A 4/3 valve therefore has four ports and three spool positions, commonly used to control double-acting cylinders.
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