Basic Hydraulics Practice Test

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• The device that converts hydraulic flow into rotary motion is called a
• Cylinders are sequenced in the reverse direction using which arrangement?
• Which end of a double-acting cylinder is pressurized to cause extension?
• What is the effect of a higher discharge coefficient C_d on the estimated flow through an orifice?
• The pressure sequence valve operates on the principle that______.
• Which of the following in not a basic part of a flow control valve?
• At a given flow rate, a cylinder retracts faster than it extends because______.
• The rod side area that produces the pull force on a double-acting cylinder is called the _____ area.
• Present the Darcy-Weisbach equation for head loss and identify the required parameters.
• Which property primarily affects hydrostatic pressure and inertia in liquids?
• How do you calculate the hydraulic force produced by a cylinder given system pressure and piston area?
• Distinguish between positive displacement pumps and dynamic (centrifugal) pumps in terms of operation and typical applications.
• Which of the following is not a type of fixed displacement pump?
• What type of valve is commonly used to control actuator speed in a closed-center system?
• A flow meter that must be installed vertically in a hydraulic system is the
• How does fluid viscosity influence head loss in a pipe?
• Relief valves return bypassed flow to which part of the system?
• As oil is pumped through a hydraulic system, it progressively____.
• What is the continuity equation relating flow rate, velocity, and cross-sectional area in a pipe?
• Dynamic head in hydraulic terminology refers to which of the following?
• In a hydraulic schematic, which component may be shown many times to indicate duplicates without implying there are more than one of that component?
• In a closed-center circuit, what happens to hydraulic flow when no actuator movement is commanded?
• How many sequence valves are typically used to achieve reverse sequencing of two cylinders?
• In a basic hydraulic system with a closed-center configuration, what provides the determinant of the pressure at which the system operates?
• A directional control valve is used to _______.
• The time for a cylinder to complete its extension stroke can be calculated if you know the _____.
• Relief valves can be categorized by actuation as
• Which statement describes the role of load-sensing valves in hydraulic circuits?
• Which statement best defines cavitation in hydraulic systems and describes its detrimental effects?
• A reverse flow check may be needed with a PRV because which of the following?
• Because pressure is on the downstream side of a PRV, oil will naturally seep into which component?
• Which statement correctly describes the function of the integral check in valve assemblies?
• A non-compensated flow control valve will cause actuator speed to change in response to load in what way?
• Which hydraulic fluid is commonly chosen for fire resistance in hydraulic systems?
• What is the basic construction and how is flow estimated in an orifice flow meter?
• How does a venturi flow meter measure flow and what principle does it rely on?
• Define Reynolds number and explain its role in determining flow regime in hydraulics.
• What term is used to describe the maximum possible reading of a pressure gauge?
• Which option is not a typical hydraulic piston motor type?
• Flow rate is equal to volume divided by_____.
• What is a load-sensing hydraulic system and what is its primary advantage?
• Which statement about pressure units used in hydraulics is accurate?
• The combination used in a typical flow control valve includes which two components?
• How do you size hydraulic piping for a given flow rate and acceptable velocity?
• Define Reynolds number and explain its role in determining flow regime.
• Single-acting vs double-acting cylinders: which statement best describes actuation?
• Pressures are stated as______.
• Which of the following is considered a basic component that governs the operation of the hydraulic system?
• Delta P is another name for______.
• Another name for a cylinder would be a(n) ______.
• Fluid power deals with the transmission and control of energy by a pressurized_____.
• Which statement defines relative roughness?
• What are the correct SI units for hydraulic power defined as P_h = ΔP × Q?
• Which pair represents the two types of relief valves used in hydraulic circuits?
• Which design approach helps reduce energy waste in a closed-center system with intermittent loading?
• In a piping system with incompressible flow, which statement about velocity and cross-sectional area for a fixed flow rate is true?
• Check valves are used in hydraulics to______.
• Which statement describes Archimedes' principle and its significance for submerged bodies in fluids?
• A check valve is sometimes used with a sequence valve to what?
• In a centrifugal pump, how does flow relate to head along the pump curve?
• In a typical closed-center system, what happens when the commanded pressure is reached and there is no load?
• How do you compute the effective piston area on the rod side of a cylinder?
• If you know the diameter D of a circular piston, which expressions correctly compute its area?
• What is a flow-control valve, and how does it regulate a hydraulic circuit?
• Which fluid property primarily affects shear losses and flow resistance?
• In a tandem center valve configuration, the signal from pressure port P is directed to which port?
• In hydraulic terminology, what term describes the instrument that supplies flow and pressure to the system?
• If stroke length is 18 inches and rod speed is 3 inches per second, extension time is approximately 6 seconds.
• Which pair correctly describes the components of a basic flow control valve?
• Which component is described as the location oil is likely to seep into due to downstream pressure after a PRV?
• Given the hydraulic power P_h and pump efficiency η_pump, which expression gives the input electrical power P_elec?
• Which pump control strategy pairs well with closed-center circuits for precise pressure maintenance?
• A flow control valve is a combination of a ______.
• A check valve built into the same body with a sequence valve is commonly called which of the following?
• Which statement defines Net Positive Suction Head (NPSH) and its role in pump operation?
• What is a hydraulic accumulator and how does it function in a system?
• If the drain on a sequence valve is blocked, the valve will most likely remain in which state?
• State the continuity equation for incompressible flow in a network and how it applies at junctions.
• If the discharge coefficient C_d for an orifice is less than 1, what does this indicate about the discharge?
• Derive the hydrostatic pressure at depth h for a liquid of density ρ and acceleration g (reference gauge pressure).
• Which component most directly defines the maximum pressure limit in a hydraulic circuit?
• Define hydraulic head and its components.
• What is the common discharge equation for an orifice plate, and what is the role of the discharge coefficient C_d?
• Which circuit maintains system pressure when the control valve is in the neutral position?
• Which safety practice is essential before servicing hydraulic equipment?
• Which statement describes a simple hydraulic circuit for two actuators driven by a single pump?
• Which fitting is designed to allow quick disconnection and reconnection of hydraulic lines?
• How do you calibrate a hydraulic pressure gauge to ensure accurate readings?
• If the pipe diameter decreases while maintaining the same flow rate, what happens to the fluid velocity and the frictional losses?
• Pascal's Law states that pressure in a confined fluid is equal and acts____.
• What type of valve arrangement is typical in a closed-center circuit to control when flow is allowed to the actuator?
• Given flow rate and projecting area, how do you determine the velocity of the cylinder rod?
• Which of the following is not shown in a hydraulic schematic?
• Which factors influence whether a system should use a hydraulic motor versus an electric motor?
• What does Pascal's law state about pressures in an enclosed fluid?
• The three types of check valves used in hydraulics are______.
• What is a hydraulic motor and how does it convert hydraulic energy to mechanical power?
• In a meter-out flow control circuit, which statements apply?
• Which statement is true about flow in a closed-center system when not commanded?
• Which steps are part of a troubleshooting checklist for a hydraulic system with insufficient actuator force?
• The two types of PRV's are ______.
• Cavitation can cause what kind of damage to hydraulic components such as impellers?
• The main function of a needle valve is to ______.
• Which statement correctly distinguishes static pressure from total pressure in moving fluids?
• The needle valve adjustment screw has a tapered end to adjust the size of the ______.
• Which statement correctly differentiates fixed displacement from variable displacement pumps in terms of control?
• How is hydraulic power of a pump calculated from system pressure and flow?
• Hazen-Williams reliability: which statement correctly describes its applicability?
• Differentiate between laminar and turbulent flow in terms of characteristics and typical Reynolds number ranges.
• In a closed-center hydraulic circuit, how is actuator movement energy typically delivered?
• Define back-pressure in hydraulic systems and explain how it can be used in control.
• What is a common advantage of closed-center circuits?
• What is the Moody diagram used for in pipe hydraulics?
• A meter-out flow control circuit is used to control loads in which of the following ways?
• Relief valves allow flow to bypass the system and return to which reservoir?
• The device that controls the path of fluid within a circuit is the
• Pressure is created by the_____.
• The hydraulic motor converts hydraulic flow into ______.
• To calculate extend speed of a cylinder, you need to know ______.
• Switching between flow control valves in a multiple-speed circuit is done using a ______.
• When selecting hydraulic fluids (e.g., mineral oil vs glycol-based fluids), which considerations are important for system performance?
• Which center configuration is explicitly associated with a P to T path in tandem center descriptions?
• Which component is commonly used to adjust actuator speed by regulating flow?
• Quick-connect fittings have a ______ valve built in.
• A meter-in flow control valve controls the speed of an actuator by_______.
• Flow occurs between two connected points in a hydraulic system when______.
• What characterizes a closed-center hydraulic circuit?
• How does hydrostatic pressure vary with depth in a fluid?
• What is pump head and how does it relate to system pressure and flow?
• An independent speed control circuit may be with a double-acting cylinder because ______.
• In a multi-speed circuit, which component is used to switch between flow paths?
• Sequence valves are most often used to______.
• Most hydraulic motors are modified designs of_____.
• What is the purpose of a relief valve setting in a hydraulic circuit and how do you choose it?
• The most common type of pressure gauge is the Bourdon Tube.
• What is true about the efficiency implications of variable displacement pumps?
• If a hydraulic system has constant pump flow and you increase resistance to flow, what happens to system pressure?
• The hydraulic lever provides______.
• The primary purpose of a relief valve is to _____.
• List common hydraulic fluids and key selection criteria for each.
• Which factors are involved in the Darcy-Weisbach head loss equation?
• The area of a circle can be calculated by_____.
• In a hydraulic system, which component is responsible for converting hydraulic energy into linear motion?
• A blocked drain on a sequence valve will cause which of the following?
• Why is pressure drop across components converted to heat, and what is its effect on system temperature?
• Which statement is correct for converting psi to bar?
• The pressure at which a relief valve actually begins to open is called what?
• What are throttling losses and how do they impact system performance?
• What is a typical role of the reservoir in a hydraulic system?
• The spool of a directional control valve is shifted to a different position by the_______.
• In a tandem center valve, pressure port P is directed to port T. Which option matches this statement?
• How is hydraulic power calculated and how do you determine system efficiency?
• Which statement best describes the role of a relief valve in hydraulic systems?
• A double-acting cylinder will extend when oil flows into the_____.
• In the Moody diagram, which two dimensionless parameters are plotted to determine friction factor?
• What is a common reason for including a reverse-flow check with a PRV?
• Cracking pressure is defined as
• What is the function of a directional control valve in a hydraulic system with two actuators, and how does it determine motion?
• A pump produces______.
• The term used to refer to the maximum readable pressure on a gauge is
• When would a closed-center circuit be preferred over an open-center circuit?
• Hazard-Williams equation is typically used for and what are its limitations?
• Which of the following is not a type of hydraulic piston motor?
• What does the term 'center' in a hydraulic valve refer to?
• What is a directional control valve and what configurations are commonly used to steer actuator motion?
• The purpose of a pressure-reducing valve in a circuit is to which of the following?
• If the load on an actuator is increased, the flow through a non-compensated flow control valve controlling the actuator speed will _____.
• What is the effect of leaks on hydraulic system performance?
• Which fitting is used to connect two circuits to a single supply?
• Pressure is equal to force divided by _____.
• Which factors influence the Darcy-Weisbach friction factor?
• Under which conditions is a hydraulic motor typically preferred over an electric motor?
• How do fixed displacement and variable displacement hydraulic pumps differ, and what are the control implications?
• In a circuit with two actuators, how does flow distribute when the actuators are connected in parallel versus in series?
• Which statement best describes the effect of increasing pipe length on head loss in a hydraulic line?
• Which type of flow meter must be oriented in a vertical position?
• Which of the following is not considered one of the five basic components of a hydraulic system?
• What is the hydrostatic force on a flat vertical wall of area A submerged to centroid depth h_c?
• What is the purpose of relief valves and load-sensing valves in hydraulic circuits?