Electro-Hydraulics and Mechanical Systems Practice Test

These questions are part of the practice quiz. Start practicing

• Which valve type is used to provide a one-way flow path, preventing backflow in a hydraulic circuit?
• Which filter is the most common on the return line and may be installed with a pressure monitoring device to indicate clogging?
• Contamination between the spool and bore in valve assemblies can cause which failure?
• Which maintenance category is associated with periodic servicing schedules?
• Pressure in a system builds up only when there is what to flow?
• The weighted ram is a type of accumulator that uses which mechanism?
• Which filter is described as a coarse filter used to prevent large solids from entering the pump?
• Which valve type is best described as a 4/3-way valve that can regulate flow by adjusting the opening cross-sections proportionally to an input signal?
• What is the characteristic of a pressure valve that is normally closed and senses at the input port?
• Which of the following is NOT listed as a quarterly procedure for valve maintenance?
• BSP comes in two types. Which statement correctly identifies the two BSP forms?
• Which component of the system performs the actual work of carrying the load?
• The primary safety rule to follow when using an accumulator circuit is always have the accumulator ____ before removing it from the circuit.
• Disadvantage: Pollution to the environment by waste oil.
• Which component removes contaminants from hydraulic fluids?
• Which filtration option is located at the pump's suction line?
• Direct contact-type accumulators are characterized by which arrangement?
• Which filter is more expensive because it must withstand system pressure?
• In a hydraulic power unit, which component converts mechanical energy into hydraulic energy?
• Which term describes a thermal condition above a specified limit that affects fluid viscosity?
• ORFS fittings are commonly manufactured in which materials?
• What is the name of the flow where velocity exceeds a critical speed and the fluid loses ordered layering?
• In a hydraulic circuit, what is the function of a bypass line around a valve?
• Which valve transforms an analog electrical input signal into proportional opening cross-sections at the outputs?
• Which valve is typically used to prevent backflow and allow unidirectional flow in a hydraulic circuit?
• Which statement best explains why the cylinder moves faster when the accumulator is used with the pump?
• Cavitation is a phenomenon where rapid changes of pressure in a liquid lead to the formation of small vapor-filled cavities in places where the pressure is relatively low. Which option represents Cavitation?
• Which item is NOT a function of accumulators?
• Which valve type is commonly associated with leakage due to clearance between the spool and bore, potentially enlarging the bore when contaminated?
• Which valve type does not depend on load to regulate flow?
• Which component supplies oil to the whole hydraulic system?
• Which valve is described as regulating flow without regard to hydraulic load?
• In fluid systems, flow direction is driven by the gradient between which two states?
• Which term describes the presence of dispersed bubbles of air in hydraulic fluid?
• Which valve variant is a check valve that can be manually unlocked to allow operation?
• How many ports and positions does a standard 4/3-way directional control valve have?
• What term describes the amount of force exerted per unit area on a surface?
• Which filter is typically described as low-pass and used in the return line?
• What is the term for subjecting a pump to operating pressures greater than those for which it was designed?
• If the accumulator were not used, what would most likely happen to the cylinder speed?
• Which component is explicitly mentioned as contributing to faster cylinder motion when used with the pump?
• How do hydraulic cylinders compare to hydraulic motors in terms of motion and oil consumption?
• Which of the following is listed as a characteristic of the ideal fluid in hydraulic theory?
• Which component helps maintain pressure in a fluid circuit equal to ambient sea water pressure plus the spring pressure?
• Whiplash/Striking occurs when an unrestrained hose fails and hose moves rapidly back and forth until energy release.
• Advantage: Smooth operation and reversal.
• Which device is used to convert hydraulic power into rotary mechanical motion in a hydraulic system?
• Compared to using the pump alone, what happens when the accumulator is engaged?
• Which best describes the interplay between the pump and the accumulator in driving cylinder speed?
• Advantage: Good control and regulation.
• Self-sealing mono-couplings provide the energy required for the hydraulic installation and may also act as a carrier for other devices.
• Which valve type is described as a 4/2-way directional control valve with hand lever actuation and spring return?
• Which term refers to the ability of a substance to resist decomposition due to temperature?
• Which item is NOT listed as a daily check for valve troubleshooting and maintenance?
• Standards for Hydraulics symbols are defined by which standard?
• In pipe flow, when the fluid moves in orderly parallel layers with faster inner layers, this describes what type of flow?
• What effect does using the accumulator with the pump have on cylinder motion?
• Hydraulic motors drive this to move the ROV, providing high thrust and precise control.
• Which cylinder is characterized by having a single working port and is returned by external forces or by a spring?
• Which item is NOT listed as a common cause of problems in hydraulic actuators?
• What is the primary purpose of a bypass function in a valve arrangement during maintenance?
• Which valve is also known as 'running away' and traps fluid under pressure until conditions change?
• Pressure buildup in a hydraulic line occurs when there is what to flow?
• Which item is an auxiliary tooling of an ROV?
• Which statement explains why the rod side of a cylinder affects retraction speed?
• Which type of port connection is recommended by NFPA for leak prevention in medium and high-pressure hydraulic systems?
• Which of the following is NOT listed among the five critical areas to check on a hydraulic system during monitoring?
• What does a pump primarily create in the fluid?
• Advantage: Start up under heavy load.
• Which component is responsible for supplying hydraulic power and energy to the system?
• Which component is used to measure system pressure?
• Which valve function restricts oil flow going out from the actuator?
• Crimp fittings are used in subsea intervention to connect and disconnect two pieces of equipment hydraulically.
• Which of the following is listed as a type of accumulator that has no barrier separating gas from oil?
• What type of motor powers the hydraulic system?
• If a hydraulic fluid has a low tendency to cavitate, it is less prone to which issue?
• Meter-in valves restricts oil flow going to the actuator. Which option correctly describes this function?
• What drives the hydraulic pump?
• Which valve is used to maintain constant flow rate irrespective of load and is described as a two-way flow regulating valve?
• Injection injury occurs when a jet of hydraulic fluid pierces the skin and enters the bloodstream.
• Which combination is associated with faster cylinder actuation in the given scenario?
• Which 4/3-way valve configuration includes a hand lever actuated with a recirculating mid position?
• Advantage of Hydraulics: Transmission of large forces using small components.
• Hydraulic hot stabs are designed for system pressure make and break by ROV.
• In piston-type accumulators, what gas load is usually used?
• Which stability concept specifically concerns resistance to chemical decomposition in water?
• Advantage: Flow control valves can be used even in movements independent of load.
• A closing element described as a ball, cone, or occasionally a disk pressed against a seat is characteristic of which valve type?
• What is the role of the accumulator in the described setup?
• Which cylinder type is defined as having one working port and returning by external force or by a spring?
• Which description matches a gas-charged accumulator?
• Cavitation can cause damage in hydraulic systems due to the collapse of vapor bubbles. What is the resulting damage?
• Which valve allows flow in only one direction and can be set by a screw?
• What term describes wearing away due to chemical reactions, mainly oxidation?
• Which is a form of leakage that can occur in hydraulic actuators?
• The ___ the viscosity index, the lesser the change in viscosity as the temperature varies.
• Which item is listed as a potential maintenance concern for hydraulic actuators?
• Which cylinder has two working ports and can extend or retract by supplying hydraulic fluid to either port?
• What are the two common types of restrictors?
• Which component restricts oil flow in both directions?
• Which statement is true about the pre-charge pressure in an accumulator?
• Is the cylinder faster during the forward stroke (extension) or the reverse stroke (retraction)?
• O-Ring Boss fittings (ORB) are precision-engineered hydraulic hose fittings designed to create what kind of connections?
• The ability of a lubricant and its additives to resist chemical decomposition in the presence of water is called what?
• JIC stands for which organization?
• Which type of accumulator is described as being constructed in two halves, either screwed or bolted together, and operates like a bladder-type accumulator?
• Which statement best describes a bladder-type accumulator?
• Which valve is normally open with sensing at the output side?
• Which valve function restricts oil flow going to the actuator?
• If the suggested setting for the counterbalance valve is 30% higher than the load pressure, what is the minimum counterbalance setting to hold the 10kg load?
• Corrective maintenance when a fault occurs includes which of the following activities?
• The direction of flow is always from what to what?
• Which term means to gradually disappear or to become thinner or smaller?
• Which component would you use to provide a rapid, limited flow of oil to a downstream system to reduce startup time?
• Which type of valve is used to control flow based on load?
• Which valve traps the fluid under pressure until pilot pressure overcomes the spring force and is sometimes called running away?
• Which term describes the condition where, during reversing, all ports are briefly connected to one another, causing pressure collapse and easy advancement?
• What issue can occur if a bladder-type accumulator is mounted horizontally?
• Which statement best describes the difference between a hydraulic cylinder and a hydraulic motor?
• Which term describes a localized gaseous condition when pressure reduces to the vapor pressure?
• Which science deals with practical applications of liquids in motion?
• Which term describes corrective actions taken after a breakdown occurs?
• Routing checks and testing as per a company's quality management system are part of which maintenance category?
• In compensators, which component acts on the rolling diaphragm to set the pressure?
• Which accumulator is described as a fully enclosed cylinder with a hydraulic oil port at the bottom and a pneumatic charging port at the top, with direct contact between the media?
• Which of the following is a consequence of the accumulator providing additional oil to the cylinder?
• In the described hydraulic system, what is the primary reason for increased cylinder speed when the accumulator is active?
• Which accumulator type is less bulky and does not discharge at constant pressure?
• Burns occur due to hose burst releasing high temperature hydraulic fluid.
• What is the primary purpose of filters in a hydraulic power unit?
• Regular thorough inspection and manufacturer’s servicing requirements correspond to which maintenance type?
• What is a primary function of an accumulator in a hydraulic system?
• Which component controls the direction of movement of the actuator?
• Which statement accurately describes the relationship between pumps and pressure?
• What filtration method is connected only when in use and can be disconnected after use?
• Which fitting type incorporates an O-ring at the face of the fitting and is commonly manufactured using Buna-N or Viton seals?
• Advantage: Favorable heat dissipation.
• Pressure line filtration uses what type of filter?
• Which item is a primary maintenance activity listed for valves during daily checks?
• What is the difference between a 4/2 way valve and a 4/3 way valve in terms of control of a hydraulic cylinder?
• Which component works with the pump to supply extra oil to the cylinder for faster motion?
• What flow valve is appropriate to use in a circuit where only the extension speed of a cylinder is controlled?
• Which component is used to store hydraulic fluid in a hydraulic power unit?
• Which phenomenon involves the release of the smallest particles from a surface due to fluid dynamics?
• Which cylinder type has two working ports and can perform work in both directions by supplying fluid to either port?
• Which flow type is characterized by smooth, layered motion with minimal mixing?
• The set of screw-thread standards used to connect and seal pipes with an external male thread and an internal female thread is known as which standard?
• In this arrangement, the presence of the accumulator with the pump primarily affects which aspect of the cylinder's operation?
• Which parameter describes the 30% increase over load pressure when setting a counterbalance valve for a 10kg load?
• What does the ISO 1219 standard primarily define?
• Which valve maintains a flow rate constant regardless of load?
• What flow valve maintains a constant actuator speed regardless of load?
• Which option best captures the role of the accumulator in this hydraulic circuit?
• Which property would be advantageous for a hydraulic fluid to maintain performance with temperature changes?
• What term describes the condition where, during reversing, all ports are briefly closed against one another while pressure is maintained, making forward movement difficult?
• Which throttling method is preferred when maintaining oil temperature in the hydraulic system?
• Return line filtration is associated with controlling what in a hydraulic circuit?
• Which item is a monthly maintenance task?
• Maintenance performed after fault detection, including fault finding and reconditioning?
• Which of the following is NOT a type of hydraulic control valve according to construction?
• What component is used to prevent the cylinder from retracting due to load?
• Which statement best describes the function of the accumulator in the described setup?
• Fluids under pressure tend to follow the line of what?
• What are drive components controlled by valves that convert hydraulic power into rotary mechanical movement?
• Compression fittings are machined with a 37-degree flare seating surface and parallel threads. They are commonly manufactured in which materials?
• Hydraulic systems provide the power and precision needed for this to perform tasks such as collecting samples, turning valves, and deploying tools.
• Which accumulator is described as consisting of a cylindrical body with an internal piston and usually nitrogen as the gas load?
• Which family of fittings uses a 37-degree flare seating surface?
• Which action is listed as part of the annual maintenance category?
• What term describes the use of a fluid with the wrong type or specification, potentially causing severe damage?
• Using hydraulics cylinder and hydraulic motor in the A frame and which it provides means to launch and recover ROVs.
• Which abbreviation represents the British Standard for pipe threads?
• Which accumulator type discharges constant pressure and is large and bulky?
• Parts of JIC include which components?
• What term describes any material foreign to a hydraulic fluid that harms performance in a system?
• Which option is NOT a primary function of a hydraulic valve?
• Which term describes maintenance that aims to detect potential faults before failure through monitoring?
• Which valve type is used to prevent actuator movement caused by external forces?
• Which statement about the system is supported by the given information?
• Which device stores energy by compressing gas?