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JE/DE Quizes #9
Hydraulics
| Question | Answer |
|---|---|
| 1.Describe how to vary the volume discharged by a gear pump | variating it's speed |
| 2.Casing obstruction in radial piston hydraulic pump will cause what to happen? | volume of the pump to decrease |
| 3.In general, what is the purpose of the casing drain on a hydraulic pump? | prevent damage due to agitation & overheating |
| 4.What is the purpose of the tilting box on a variable stroke axial piston hydraulic pump? | to change delivery rate |
| 5.What determines the cushioning effects in a hydraulic cylinder? | cushioning value setting |
| 6.Describe the travel of a hydraulic cylinder if the cushioning valve is not open enough. | slow too soon & continue to creep |
| 7.Explain the purpose of a hydraulic system pressure relief value? | establish the max operating pressure |
| 8.Describe the purpose of strainers with regards to hydraulic system operations | prevent solid particles from entering the pump |
| 9.Where are the filters usually located in a hydraulic system | between the pump and the directional control value |
| 10.What is the purpose of a hydraulic accumulator? | store energy in form of fluid under pressure |
| 11.List the possible causes for a radial piston hydraulic pump to not deliver the rate discharge volume | obstructed suction passage |
| 12.What is the significant diff, when comparing a bent-axis, axial piston, variable stroke hydraulic pump, to a variable angle tilting box, axial piston pump where the number, diameters & rotating speed of the piston for each pump are the same? | maximum capacity |
| 13.Explain the purpose of a hydraulic system unloading value? | jumps some or all of system fluid back to tank until additional flow is required |
| 14.Explain the purpose of a hydraulic system counterbalance value | prevent stray movement of vertical loads |
| 15.Explain the purpose of a hydraulic system sequence value | permit the completion of one action before the 2nd action |
| 16.What is the purpose of spring-centered values, three position values, and two position values? | directional control |
| 17.Discuss the dangers if oil leaking out from bet the value/cylinder barrel is not continuously drained on a variable stroke axial piston hydraulic pump | could cause damage to the pump |
| 18.What controls the discharge capacity of an axial piston hydraulic pump? | squash plate / pump housing angle |
| 19.List the steps to be performing prior to performing any maintenance on a stored energy hydraulic system? | lock out tag out, relieve pressure |
| 20.What precautions should be taken after installing new components in a hydraulic system? | check filters and strainers frequently |
| 21.Describe what happens if the internal drain becomes clogged at either end of a hydraulic control valve? | value will become hydrauly locked |
| 22.Why due we try to minimize turbulence in a hydraulic system? | to reduce energy lost |
| 23.What aspect of a hydraulic hose determines it's strength? | braided inner layer |
| 24.Where due you find the size of a hydraulic hose? | printed or stamped on the outside of the hose |
| 25.Why due we allow room for expansion when installing hydraulic hoses? | flexible hose may pull out from it's fitting |
| 26.Define torsional deflection | twisting or bending of a shaft or hose |
| All complete hydraulic systems have | 6 basic elements |
| Actuators convert ______ power to ______ power | hydraulic power to mechanical power |
| Name the 3 basic types of control values | directional control, flow control & pressure control |
| In hydraulic system, piping & fittings are refereed to as ______ and ______ | conductors & connectors |
| Hydraulic fluid transmits power thru a system & it also _____ the system | lubricates the system |
| The 3 important functions of a hydraulic fluid are to ____, ____, and ____ the fluid | store, clean and cool |
| The quickest, most effective way to trace a hydraulic system is to have a ____ of it | diagram |
| Hydraulic system, commonly include ____ with in ____ | circuit within circuit |
| A feed-cycle control panel controls the ____ ____ of the slide or similar device | feed rate |
| When troubleshooting a system that's operating properly, first check it's | control devices |
| A regenerative circuit is one in which the pressure source is simultaneously connected to the ____ and ____ ends of the cylinder | rod and cap |
| Most valves & pumps are commonly adaptable to many installations because they are | convertable |
| A cylinder is extended by the combined action of the system ____ and the fluid ____. | pressure, flow |
| For control purposes, hydraulic system may use manually operated ____ rather than solenoids | lever valves |
| The 3 basic types of diagrams used to show the layout of a hydraulic circuit | cutaway, pictorial, schematic |
| A schematic drawing uses ____ and ____ to explain how a system work. | lines and symbols |
| On a hydraulic schematic, a dotted line always indicates a ____ line | drain |
| What symbol may be used to show the direction of fluid in a hydraulic schematic | arrows |
| An advantage of using schematic symbols with hydraulic drawings is that they always have the ____ meaning | same |
| Symbols used in hydraulic drawings are connected by ____ to show system flow | lines |
| The position of symbols on a schematic don't always represent the ____ position of elements | actual |
| Name the 3 kinds of system described by schematics | electrical, piping, fluid power |
| The difference bet the symbols used for hydraulic motors & pumps is in the position of the | arrow |
| Hydraulic value symbols show ____ paths, and ____ fuctions | flow, value |
| In addition to their mechanical connection, values often require an ____ hook up | electrical |
| Many initial start-up of hydraulic systems fail because the valve ____ have been left ____ | ports,open |
| Where flexible couplings aren't used, acceptable connections are ____ and ____ drive connections | splines & tang |
| When 3 phase or series-wound electric motors are used, they can be connected to operate in ____, ____. | either direction |
| A pump shaft shouldn't be subject to ____ or side thrust | end thrust |
| When mounting pumps & motors always align the ___ shaft to the ____ shaft | motor, pump |
| Before operating most hydraulic pumps, the pump ____ must first be filled with _____, oil | housing, hydraulic |
| When you fill a reservoir, be sure that the cylinders are | retracted |
| To prevent possible eqpt damage, never adjust a pump for a pressure ____ than called for | higher |
| Name the 3 method of connecting control valves to a hydraulic system | subplate connections, inline threaded connections, inline flanged connections |
| What is another name for a sandwich plate mounted with a value | manifold |
| The current standard method of specifying pipe is by using ____ ____. | schedule numbers |
| Piping to & from hydraulic pumps is classified as ____piping and ____ piping | pressure, suction |
| The diameter of inlet piping should be no ____ than the pump intake | smaller |
| Name the 3 principal considerations in tubing selection | material, wall thickness, indside diameter |
| Seals are classed as being either static or | dynamic |
| Cylinders & pistons are usually protected by ____ seals | molded or formed |
| The return line in the reservoir should be separated from the inlet by a | baffle |
| Cylinders should be stored with their rods | retracted |
| The basic function of a hydraulic fluid is to transmit ____ and energy | force |
| The 2 basic types of a hydraulic lubrication are ____ and ____. | hydrodynamic & boundry |
| The property of a hydraulic fluid that has the greatest effect on system performance or efficiency is it's? | viscocity |
| The factor that has the greatest influence on the viscosity of a hydraulic fluid is | temperture |
| The term that identifies chg. in fluid viscosity when the temp changes is called the fluids | viscosity index |
| A hydraulic fluid that's almost unaffected by temp changes has a viscosity index that is | high |
| The ability of a fluid to resist permanent physical changes caused by stress is called ____, ____. | sheer stability |
| The oxidation of a hydraulic fluid can be reduced or prevented by the use of oxidation ____. | inhibitors |
| The lowest temp at which a hydraulic system can operate is determined by the max viscosity index rating of the ____. | pump |
| The 2 categories of fire-resistant fluids are ____, ____ and ____. | water base & synthetic |
| The viscosity index of synthetic fire-resistant hydraulic fluids is much ____ than max viscosity index rating of the | lower |
| The capacity of the intake strainer in a system that uses fire-resistant fluids should be ____ times that of the pump. | 4 |
| Hydraulic fluids must be ____ with materials used in the system | compatible |
| Hydraulic fluids normally include ____additives. | anti-form |
| The viscosity rating of petroleum-based hydraulic oils are measured in ____F and ____F | 100f & 210f |
| When selecting a hydraulic fluid, you should know the system's minimum ____ and maximum ____ temperature. | start-up & operating |
| Petroleum-based rust preventives can be removed by flushing the system with ____. | oil |
| When flushing a hydraulic system, never use ____ solvents. | chlorinated |
| Flushing oil should be circulated throught a hydraulic system at ____ pressure | low |
| The frequency & eqpt inspected will depend on the ____ itself | system |
| The first step in organizing maintenance planning for hydraulic system is to assign a number to ea. system ____. | reservior |
| When the fluid level of a hydraulic reservoir is inspected the actuator should be ____. | retracted |
| When the reservoir fluid level drops for an unknown reason,always check for ____ leaks in the system | external leaks in the system |
| The mounting rigidity of hydraulic system elements should be checked every ____ hours of operation or every ____ months. | 500, 3 |
| The operating pressure in a hydraulic system should be checked at lease once every ____ hrs of operations. | 100 |
| A sample of hydraulic fluid should be sent for laboratory analysis at lease ____ a year. | twice |
| Symptoms must never be mistaken for the basic ____. | problem |
| When an adjustable wrench is used, the pressure should bear against the ____ jaw. | fixed |
| When testing a hydraulic relief valve,connect the test gage at the value____. | inlet |
| Pinched hydraulic lines bet pumps & relief valves cause ____ system pressure | reduce |
| Common value problems include excessive leakage, distorted springs, broken parts, sticking or jamming and excessive ____. | leakage |
| After you make a visual check of a faulty hydraulic system, you should start a test of the system at the ____. | reservoir |
| When you test a control value, connect the gage at the inlet side of the ____. | actuator |
| If the pressure head of the value is normal, but the pressure is low at the actuator the ____ is bad. | value |
| Value parts that show wire drawing have usually been damaged by excessive ____. | leakage |
| The common cause of failure of an a/c powered control value is ______ malfunction. | solenoid |
| Solenoid failure is caused by either electrical or ____ problem. | mechanical |
| When a value spool sticks in a a-c control value, and the solenoid cont. to draw starting current ____ occurs. | overhaul |
| Misalignment of hydraulic cylinders is usually caused by excessive ____, _____. | side load |
| When pressure testing a cylinder with the load disconnected, an increase in fluid pressure indicates internal _____. | binding |
| A drop in fluid pressure bet the control value outlet & the cylinder indicates a ____. | blockage |
| When testing a cylinder, fluid flow after the piston has completed it's stroke indicates internal ____. | leakage |
| Always make sure piston seals are compatible with hydraulic ____used in the system | fluids |
| Troubleshooting tests that can be conducted on operating hydraulic pumps determine the pressure ____ and ____. | flow, and temperture |
| Pitted gear teeth & grooves on the side wear plates of hydraulic pump indicate the presence of ____ contaminants. | solid |
| Air can be identified in a hydraulic system by pump noise and a ____ system | spongy |
| Cavitation in a hydraulic pump is harmful because it creates | contaminants |
| Wire drawing on the wear plates in a hydraulic pump occurs when the fluid viscosity becomes | low |
| Name 4 causes of metallic contact in a hydraulic pump | misalignment, body distortion, poor lubrication, end thrust |
| Repeated seal blow-out, cracked or broken teeth, & broken rotor segments in a hydraulic pump all indicate the presence of? | pressure shock |
| The only controls used with gear pumps are ____ value | relief |
| Vane pumps are manufactured to have either ____ displacement or ____ displacement | constant or variable |
| In a variable-displacement pump, the circuit ring movement is controlled by a pressure ____ | compensator |
| Axial piston pumps can produce higher discharge pressure because of their close ____ | tolerance |
| When do the vanes in a vane motor remain in contact with the motor ring? | at all times |
| Wear in a vane pump can be reduced to a minimum by using the proper ____ | fluid. |
| Hydraulic system should always be serviced on a ____ basis | regular or systematic |
| The frequency and equiement inspected will depend on the ____ itself | system |
| The time lapse between hydraulic system inspection is determined according to ____ time and ____ | operating calender |
| A maintenance file should be maintained for _____ hydraulic systems in the plant | every |
| Whenever equipment is added to or removed from service, the maintenance records should be ____ accordingly | updated |
| Regular inspection of the hydraulic system is a simple form of ____ maintenance. | prevented |
| When the fluid level of a hydraulic reservoir is inspected the actuator should be ____ | retracted |
| With proper planning, most hydraulic system repairs can be made according to a ____ | schedule |
| When working on hydraulic systems, personal ____ should NEVER be sacrificed for production | safety |
| Regular hydraulic servicing should be scheduled and performed whether the system appears to ____ it or not. | need |
| Troubleshooting is a methodical system of cause-and-effect thinking and ____inspection | logical |
| The first thing to do when a hydraulic system breaks down is to review the recent history of it's operation and ____ | performance |
| If a previous malfunction has occurred, you should first review what previous ____ or ____ were performed. | service, adjustment |
| When all symptoms have been identified, the next step is to determined the ____ | cause |
| To save time and effort in troubleshooting, first check the probable causes that are ____ to check | easiest |
| Methodical troubleshooting requires more extensive involvement as you proceed: yet each step is quiet ____ | simple |
| The best wrenches to have in your troubleshooting kit are the proper size ____ ____ wrenches | open, end |
| If an over sized wrench is used on hex nuts the corners of the nuts are likely to become ____ | rounded |
| A strap wrench should be used on ____ or ____ surface | plated, polished |
| One of the best ways to locate the cause of trouble in a hydraulic system is to check fluid flow with a ____ | gage |
| Flow meters are most often used in hydraulic system for ____ | testing |
| A hydraulic system tester connected at various points in a system gives an accurate picture of the system's ____ conditions | operating |
| Always keep in mind that for every troubleshooting problem there is both a ____ and a ____ | reason, solution |
| When trying to locate trouble, it is helpful to know the ____ of the trouble | systoms |
| Before replacing a hydraulic pump, shut off the power and ____ the power switch | tag |
| When installing a replacement pump, connect the coupling and check for proper ____ of the motor shaft | alignment |
| If pump bearings fail and the pump housing becomes damageded, it is almost certain that ____, ____ are being carried in the hydraulic fluid | metal, particles |
| A good troubleshooting guide should provide identification of possible ____, probable ____, and common ____. | trouble, cause, remedies |
| Properly repairing a value means repairing all parts according to ____ or replacing the parts found to be faulty | specification |
| Normally, values are checked during routine overhaul and after a system ____ | breakdown |
| Before you decide that there is trouble in a valve, the circuit should be ____ | tested |
| A system's maintenance file should be checked ____ you make a visual check of the system | before |
| A illustrated parts breakdown is helpful in value ____. | disassemble |
| If the parts are laid out in their exact order as the value is disassembled, the ____ and ____ | inspection, reassembly |
| To properly clean the parts in a hydraulic unit, you may be required to de-grease and ____ them | devarnish |
| The parts that must always be replaced when hydraulic valves are dissembled are the ____ | seals |
| General inspection of value parts consist of looking for surface____ | deformities |
| Pipe-tapped value bodies become over stressed when taped pipe connections are ____ | overtorched |
| Foreign matter on sub-plate surfaces of hydraulic valves often results in ____. | leakage, "weep" |
| The first thing you should do when you have to replace a solenoid is to make sure the ____. | electric power is turned off |
| Replacement solenoid must have the same part number, or they must meet the recommended ____ | speciefication |
| The material of a replacement seal and the hydraulic fluid must be ____. | compatable |
| Spools fit better during installation if they are ____, ____. | lightly lubricated |
| Before you install a reconditioned valve, you must ____, ____. | performance test |
| Name the type of cylinder construction most used in industrial hydraulic cylinders | tie rod |
| Trouble shooting a hydraulic cylinder should be done in a ____ sequence | logical |
| External misalignment can be checked by cycling the cylinder while the load is ____. | disconneted |
| Extreme side loading usually causes the piston rod to ____. | break |
| Before repairing a cylinder make sure you have a detail ____, ____ of the cylinder | parts assembly drawing |
| When disassembling a cylinder always place the parts in the same ____ in which they are placed. | order |
| Cylinder tubes are plated to both extend their life and prevent ____. | corrosion |
| A formed soft piston seal used whenever the cylinder is used for a ____ operation | holding |
| Dirt or other contaminants are usually removed from the piston rod by a rod ____. | wiper |
| When fixed cylinder are installed always make sure they are properly | aligned |
| When a hydraulic cylinder is installed in an extremely dirty location be sure to use a piston rod ___ for protection | boot |
| Problems that occur in hydraulic pumps also occur in hydraulic ____ | motors |
| Gear pump are classified by their general construction and as to having external or ____ gears. | internal |
| Excessive wear or scratches in a pump indicate the presence of ____ contaminants | solid |
Created by:
Rafael Leon