Hydraulics Flashcards
The hydraulic press is an example of what law?
Pascal’s law
T/F a smaller weight can move a larger weight with a lever but the lever must move a greater distance
True
Force can be measured in what?
Pounds
Increasing force in a hydraulic system causes what?
Pressure to increase
Pascals law explains how: Fluid stays in a barrel A small jack can lift a two ton car An oil tanker floats To calculate the force of gravity
A small jack can lift a two ton car
T/F Pascal’s law states that any change in pressure in an enclosed fluid is applied equally to all the fluid in the enclosure
True
What innovation allowed hydraulic technology to explode and be used in practical ways for the first time? Force pump Aqueduct Steam shovel High pressure hose
High pressure hose
What is pressure? Weight of an object Force acting on a given area The area of a pair of snowshoes Gravity
Force acting on a given area
T/F A 4/3 way DCV relieves fluid pressure.
False
T/F double acting cylinders can only apply force in one direction
False
T/F Hydraulic systems use oil rather than water because its self lubricating, has more viscosity and doesnt lose energy
True
Single acting cylinders apply force in: Only One direction Two directions All directions Multiple directions
Only one direction
T/F The filter removes impurities from the oil to allow the hydraulic system to work at maximum efficiency
True
The hydraulic system pulls this component from the reservior: Electricity Fluid Coolant Contaminants
Fluid
T/F The pressure relief valve maintains the minimum pressure in the hydraulic circuit
False
The purpose of the hydraulic system is to perform work in the real world. What component actually performs this work? Pump Reservoir Actuator Accumulator
Actuator
The schematic symbol for a flow line is: An upside down triangle The letter "E" lying flat A diamond with a dotted line through it A straight horizontal line
A straight horizontal line
Which component allows an actuator to maintain its pressure even after the pump stops? Directional control valve Check valve Reservoir Hose
Check valve
This component stores energy in the form of pressurized gas: Accumulator Actuator Pump Reservoir
Accumulator
This valve has two ports and two switching positions, allowing fluid to flow both ways through the valve: 3/2 way valve 4/2 way valve 4/3 way valve 2/2 way valve
2/2 way valve
What is fluid movement called? Flow Pressure Resistance Energy
Flow
Which type of machine removes material from a workpiece by pushing or pulling a tool with teeth through the material? Stamping machine Foraging machine Broaching machine Workholding machine
Broaching machine
T/F Before performing system maintenance, you should work the valves in all positions
True
Before working or performing maintainence on any hydraulic system, first allow the system to do what? Warm up Cool completely Run for several hours Never perform maintainence on a system
Cool completely
How long should you wait for the hydraulic system to cool down after operation? 10 minutes 30 minutes 45 minutes 1 hour or more
1 hour or more
T/F if a high pressure hose breaks, it can continue flailing even when the pump has stopped operating.
True
T/F The accumulator can hold pressure to operating levels even when the pump isn’t running.
True
The best way to check for a pinhole leak is With your hand With your arm With a piece of wood or cardboard To examine the hose
With a piece of wood or cardboard
T/F The most important concern when working in any type of manufacturing is safety
True
What is one thing you should not do during operation of a hydraulic system? Service the system Turn the system off Follow the operating manual Call your supervisor
Service the system
What should you do if you think you've recived a pinhole leak injury? Seek medical attention immediately Put a bandage on it Ignore it Wash the area and return to work
Seek medical attention immediately
What should you do when a high pressure hose fails and begins leaking Break for lunch Tell your coworkers Press the E stop button Repair the problem yourself
Press the E stop button
Always report any problems you find to: Your supervisor The maintenance team Your coworkers Research and development
The maintenance team
Checking the oil cooler and the heat exchanger to see if theyre working means that youre looking for what type of problem? Low fluid Low pressure Pump failure Burning smells
Burning smells
T/F following a maintenance program is the most effective way to prolong system life.
True
T/F Its a good idea to listen for unusual sounds from the system pump and report them to maintenance
True
Most contaminants, such as dirt, dust, debris, and water, enter the hydraulic system through the: Reservoir Valves Filters Dipstick
Reservoir
T/F No matter how careful you are, normal operations will admit some contaminants into the hydraulic system
True
What types of areas on cylinders and valves indicate leaks? Dry clean areas Wet or dirty areas Pinched areas Hot areas
Wet or dirty areas
To perform an out of circuit test, a component can be placed on a Reservoir Calibration tester Test bench Work cell
Test bench
When working around hydraulic equipment: Wear loose fitting clothes Wear canvas shoes Remove any rings Wear long sleeves
Remove any rings
Before you bleed the system pressure during troubleshooting: Check the pump flow rate Check the system pressure Remove all shields Support any overrunning loads
Support any overrunning loads
\_\_\_\_\_ test ports allow you to take pressure measurements without breaking into a hydraulic line to install a tee Line System In line Valve
Valve
An increase in flow from the \_\_\_\_\_ can indicate excessive wear Outlet of an actuator Pump Case drain Motor
Case drain
Which method of flow measurement requires a shutoff valve to divert flow from the system through the flow meter? Inline Bypass Isolation Reroute
Bypass
A pressure change problem in a multiple pressure circuit is a \_\_\_\_\_ related fault. Machine sequence Machine performance System Machine execution
Machine sequence
Which of these forms of system level troubleshooting do experts recommend against using? Symptom and cause Half-split Output back Shotgun
Shotgun
Worn \_\_\_\_\_ in a cylinder can allow leakage that can result in slow actuator speed. Cushions Seals Reverse flow checks Sleeves
Seals
Fast actuator speed can by flow control valves, relief valves, and: Pumps POC valves Counterbalance valves DCVs
Pumps
T/F one of the major causes of incorrect deceleration is misadjustment of the deceleration components
True
What percent of all hydraulically powered machine downtime and malfunctions are due to contamination in the fluid?
More than 50%
The most common location for a filter is in the \_\_\_\_\_, where the filter cleans all fluid returning to the reservoir. Pump Main Return line Motor Reservoir
Main return line
A(n) \_\_\_\_\_ filter has a filter element enclosed inside a metal shield. Spin-on Cartridge-type Suction strainer Pump
Cartridge-type
A(n) \_\_\_\_\_ is a device used in the suction line of a hydraulic system to remove contaminating particles Spin-on filter Suction Strainer Cartridge-type filter Reservoir
Suction strainer
As a filter collects dirt, the \_\_\_\_\_ difference will grow, indicating that it is time to clean or replace the filter Pressure Volume Flow Dissolved solids
Pressure
