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The CFPHS exam has 50 questions and runs 3 hours.
These 10 free CFPHS questions are organized by exam domain, so you can see how each part of the Fluid Power Hydraulic Specialist blueprint is tested. Reveal the answer and explanation under each question.
A press uses a double-acting, single-rod cylinder. During rapid advance, the pump and both cylinder ports are interconnected, with the tank path blocked. The tooling reaches the work, but the cylinder stalls at the correctly set pressure limit. Line losses are negligible. Which circuit change provides full-force extension without raising that limit?
Correct answer: C - Connect the rod port to tank while keeping the cap port pressurized.
During a stationary acceptance test, a loader's bucket lifts more slowly whenever the operator steers. Steering remains responsive, and lift speed returns when steering stops. One fixed-displacement pump supplies steering through a priority valve and the lift circuit through its excess-flow outlet. Pump delivery meets specification at the test speed and pressure. How should the specialist respond to a recommendation to overhaul the pump?
Correct answer: D - Retain the pump; steering demand temporarily reduces the flow available to the lift circuit.
A four-way valve's original neutral position connects P to T and blocks A and B. A proposed replacement has P blocked and A and B connected to T in neutral. The circuit uses a continuously running fixed-displacement pump, a main relief valve, and no other unloading path. P is the pump port, T is tank, and A and B serve the cylinder. Predict the replacement valve's neutral-state behavior.
Correct answer: D - The pump runs against the relief, and both cylinder ports connect to tank.
A hydraulic motor drives a winch through a 5:1 speed reducer: the motor turns five revolutions for each drum revolution. At steady lifting speed, the drum requires 900 N·m at 60 rpm. The reducer's mechanical efficiency is 90% at this operating point. What torque and speed must the motor deliver at its shaft?
Correct answer: B - 200 N·m at 300 rpm
A machine requires at least 45 L/min at its working pressure. Its fixed-displacement pump will run at 1,500 rpm. Four candidate pumps each have 90% volumetric efficiency at that operating point and satisfy the pressure, speed, and inlet requirements. Select the smallest displacement that meets the required delivery.
Correct answer: C - 36 cm³/rev
A bladder accumulator is warm immediately after nitrogen charging, and its gas-pressure reading gradually falls as it cools. The hydraulic side is depressurized and open to tank. Once temperature stabilizes, the pressure remains constant at the manufacturer's specified precharge for that temperature. How should this precharge check be concluded?
Correct answer: C - Accept the stabilized reading as the precharge value.
A vertical, rod-up cylinder supports a platform on its cap-end chamber. During lowering, gravity can retract the rod faster than the pump fills the rod-end chamber. A valve at the cap port must automatically hold the load when lowering is not commanded and modulate outflow during descent. Which selection meets both requirements?
Correct answer: A - A pilot-assisted counterbalance valve with its pilot connected to the rod-end line.
Immediately after a suction-hose replacement, a hydraulic pump develops a crackling noise and erratic delivery. At the specified test speed, inlet pressure is 0.55 bar absolute; the pump manufacturer requires at least 0.80 bar absolute. Reservoir level, oil viscosity, and shaft speed are correct. The machine is shut down after the readings are taken. Which finding should the inspection target first?
Correct answer: A - A restriction or internal collapse in the replacement suction hose.
Comparable oil samples from the same hydraulic system are analyzed with the same calibrated particle counter. The ISO 4406 code changes from 18/16/13 to 18/16/11. Which interpretation is supported by those two reports?
Correct answer: A - The count band for particles at least 14 µm(c) is lower; the other counts may have changed within their existing bands.
Review this hydraulic fixture's PLC logic: EXTEND := (START AND CLAMP_OK) OR EXTEND. The right-hand EXTEND term is the previous scan's output state; START is momentary, and CLAMP_OK indicates adequate clamping pressure. After a valid start, START is released and CLAMP_OK becomes false. No other logic writes EXTEND. What happens on the next scan?
Correct answer: B - EXTEND stays on through its own parallel path.
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