10 exam-style questions with answers and explanations, straight from our 1,030-question bank. Tap an answer to check yourself. When you're ready, take the scored version in the free practice test.
The CFPMHM exam has 75 questions and runs 3 hours.
These 10 free CFPMHM questions are organized by exam domain, so you can see how each part of the Fluid Power Mobile Hydraulic Mechanic blueprint is tested. Reveal the answer and explanation under each question.
Domain 1: Understand hydraulic components and their operation.
Question 1
A wheel loader uses one fixed-displacement pump for steering and implement hydraulics through a steering-priority valve. Loaded pump delivery and the individual steering and lift tests meet specification. During simultaneous operation, steering remains normal, but the bucket lifts more slowly until the operator stops turning the wheel. A proposed repair calls for replacing the priority valve. How should the mechanic respond?
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Correct answer: A - Retain the valve; the observations are consistent with normal priority-flow sharing.
Domain 2: Understand loads and motion.
Question 2
An attachment cylinder has a 4.00-in bore and a 2.00-in rod. During retraction, the rod-end supply is limited to 1,800 psi, and the cap end must discharge against 300 psi of backpressure. Ignoring friction, which assessment of its ability to retract against a 15,000-lbf load is correct?
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Correct answer: D - Approximately 13,200 lbf is available; the cylinder cannot retract the load.
Question 3
A single-rod attachment cylinder uses regenerative extension for rapid approach, then switches to conventional extension for the working stroke. In regenerative mode, the cap and rod ports are interconnected and supplied by the pump. Neglecting line losses, which pairing explains the faster approach and reduced available thrust?
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Correct answer: B - Combined pump and rod-end flow enters the cap end; thrust uses rod area.
Domain 3: Maintain and repair hydraulic systems.
Question 4
While diagnosing a hose leak, a mechanic feels a brief sting from a fine hydraulic-oil jet. A tiny puncture is visible on one finger, but there is little pain and no swelling. A coworker has already isolated the equipment. What should happen next?
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Correct answer: B - Obtain emergency medical care now for suspected high-pressure fluid injection.
Question 5
The shaft seal on a newly installed piston pump starts leaking during commissioning. Pump outlet pressure is correct, but case pressure reaches 4.2 bar against a stated maximum of 1.5 bar. The case drain was connected to the common return line upstream of its filter; the installation drawing calls for a separate low-backpressure drain to the reservoir. The machine has been shut down. Which repair addresses the cause as well as the damage?
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Correct answer: A - Correct the case-drain routing and replace the damaged shaft seal.
Domain 4: Troubleshoot hydraulic systems.
Question 6
A hydrostatic loader loses tractive effort as its oil warms. At the specified test speed and temperature, charge pressure falls below the service limit only under drive load. The charge pump passes its delivery test, and inlet and filter checks are satisfactory. Separate case-leakage tests, with loop-flushing flow excluded, show excessive leakage from the travel motor but normal leakage from the main pump. Which fault best accounts for the loss of drive?
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Correct answer: C - Excessive internal motor leakage is depleting the charge flow needed to maintain the low-pressure loop.
Domain 5: ElectroHydraulic control systems.
Question 7
A proportional valve has an internal linear variable differential transformer (LVDT). Its electronics compare commanded and measured spool position and correct any difference. The cylinder has no position or speed feedback, and a change in load changes cylinder speed even while the spool tracks its command. How is this control arrangement classified?
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Correct answer: C - Only spool position is closed-loop controlled; cylinder motion remains open-loop.
Domain 6: Identify Fluid Power Symbols
Question 8
On a hydrostatic-drive schematic, a component is represented by a circle containing two filled triangles pointing outward in opposite directions. A diagonal adjustment arrow passes through the circle. Identify the component.
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Correct answer: B - A variable-displacement, reversible hydraulic pump.
Domain 7: Identify Fasteners and Fittings
Question 9
Two adapters have the same measured straight-thread diameter and pitch, and either will screw into a replacement hose swivel. The hose end has a 37-degree sealing seat; one adapter has a 37-degree cone and the other a 45-degree cone. What determines which adapter can make the intended pressure-tight connection?
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Correct answer: A - Matching the sealing-seat angle; the threads provide the clamping force.
Domain 8: Use of Multimeter
Question 10
A 24-V on/off solenoid pulls in weakly. It is supplied through a relay and has a direct ground return, with no electronic low-side driver or pulse-width modulation. With the coil connected and commanded on, the battery measures 24.4 V. Referenced to battery negative, the coil's supply terminal measures 24.1 V and its return terminal measures 8.0 V. Which fault is supported by this voltage-drop test?
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Correct answer: D - Excessive resistance in the coil's ground-return path.