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.
These 10 free CFPPS questions are organized by exam domain, so you can see how each part of the Fluid Power Pneumatic Specialist blueprint is tested. Reveal the answer and explanation under each question.
Domain 1: Understand The Functions Of Pneumatic Components In Circuits.
Question 1
A horizontal transfer cylinder has become slow on extension but still retracts normally. During the slow stroke, pressure at the directional valve inlet and the cylinder cap end remains near 6 bar gauge. The rod-end chamber and the valve's connected exhaust passage both remain near 3 bar gauge, including downstream of the fully open speed control. Previously, this exhaust passage was near atmospheric pressure. The load and tubing have not changed, and measured exhaust mass flow has not increased. Where should fault tracing begin?
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Correct answer: B - The silencer on that exhaust passage, for a restriction creating excessive backpressure.
Question 2
An acceptance test records 5.0 bar gauge downstream of a regulator while air is flowing. When demand stops, the outlet rises promptly to 5.1 bar and remains there throughout a ten-minute observation. Inlet pressure and temperature are stable, there is no downstream pressure source, and flow resumes at the required 5.0 bar. Both readings meet the machine specification. How should this result be classified?
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Correct answer: C - Normal lockup behavior; these observations do not justify regulator replacement.
Question 3
Two one-way flow controls are mounted at the ports of a double-acting cylinder for meter-out speed control. Extension meets its target, but retraction must be slowed. The check valves work correctly, and no other restriction limits either stroke. Which adjustment selectively reduces retraction speed?
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Correct answer: D - Close the cap-end flow-control needle slightly.
Domain 2: Analyze Loads and Motion
Question 4
A double-acting cylinder must retract against an 800 N axial load. Its bore is 50 mm and its rod diameter is 20 mm. During the attempted retraction, rod-end pressure is 6.0 bar gauge, cap-end backpressure is 1.2 bar gauge, and opposing seal friction is 60 N. Neglect acceleration. Which assessment of the available retracting force is correct?
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Correct answer: A - Approximately 690 N; the cylinder cannot overcome the load.
Question 5
A cylinder-driven jib lifts normally through most of its travel but stalls near the upper position. At that position, the cylinder's line of action passes almost through the boom pivot. Chamber pressures remain at their specified values, and the linkage is not binding. Raising supply pressure is not permitted. Which redesign most directly improves the cylinder's lifting moment in the problem region?
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Correct answer: D - Reposition a cylinder mounting point to increase its perpendicular moment arm there.
Domain 3: Select Components For Pneumatic Systems
Question 6
Cylinder A transfers a tray; cylinder B then ejects its contents. B is currently triggered when pressure in A's cap-end line reaches 4 bar gauge. A misaligned tray stops A halfway through its stroke, yet B still advances. The process requires proof that A has reached its fully extended position before B can move. Which modification establishes that proof?
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Correct answer: D - Make A's fully extended position sensor a required condition for enabling B.
Question 7
A remote blow-off station loses pressure during each brief air pulse, then fully recovers before the next pulse. The main plant header stays at its specified pressure, and compressor capacity exceeds average demand. Testing identifies the long branch pipe as the restriction, but replacing that pipe is not feasible. A storage calculation confirms that a local receiver can cover each pulse and recharge between pulses. Where should that receiver connect?
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Correct answer: A - After the restrictive branch pipe, just upstream of the pulse valve.
Question 8
Four identical circular suction cups grip the vertical face of an airtight 18 kg panel and accelerate it upward at 2.0 m/s². The cups share the load equally; friction carries the load parallel to their faces. The measured friction coefficient is 0.50, cup pressure is 40 kPa absolute, and ambient pressure is 100 kPa absolute. Apply a safety factor of 2.0 to the gravity-plus-acceleration load; use g = 9.81 m/s² and neglect peeling moments. Which is the smallest offered effective cup diameter that satisfies this force check?
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Correct answer: C - 80 mm.
Domain 4: Electropneumatic Control
Question 9
A replacement inductive proximity sensor must make a PLC input true when a steel tray is present. The input module supplies current from +24 V and turns on when the field device conducts that current to 0 V. The existing input module and program will remain unchanged. Which three-wire sensor output is directly compatible?
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Correct answer: C - NPN, normally open.
Question 10
In a relay circuit for routine machine start/stop control, a normally open Start contact and a normally closed Stop contact form one series branch. A normally open RUN auxiliary contact forms a second branch parallel to that entire first branch; either branch can energize the RUN coil. After starting, pressing Stop does not release RUN. The contacts themselves operate correctly. What correction preserves latching after Start is released and lets Stop interrupt RUN even while Start is held?
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Correct answer: B - Place Stop in series with the parallel combination of Start and the RUN auxiliary contact.
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