Hydraulics Flashcards
1
Q
The hydraulic press is an example of what law?
A
Pascal’s law
2
Q
T/F a smaller weight can move a larger weight with a lever but the lever must move a greater distance
A
True
3
Q
Force can be measured in what?
A
Pounds
4
Q
Increasing force in a hydraulic system causes what?
A
Pressure to increase
5
Q
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
A small jack can lift a two ton car
6
Q
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
A
True
7
Q
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
A
High pressure hose
8
Q
What is pressure? Weight of an object Force acting on a given area The area of a pair of snowshoes Gravity
A
Force acting on a given area
9
Q
T/F A 4/3 way DCV relieves fluid pressure.
A
False
10
Q
T/F double acting cylinders can only apply force in one direction
A
False
11
Q
T/F Hydraulic systems use oil rather than water because its self lubricating, has more viscosity and doesnt lose energy
A
True
12
Q
Single acting cylinders apply force in: Only One direction Two directions All directions Multiple directions
A
Only one direction
13
Q
T/F The filter removes impurities from the oil to allow the hydraulic system to work at maximum efficiency
A
True
14
Q
The hydraulic system pulls this component from the reservior: Electricity Fluid Coolant Contaminants
A
Fluid
15
Q
T/F The pressure relief valve maintains the minimum pressure in the hydraulic circuit
A
False
16
Q
The purpose of the hydraulic system is to perform work in the real world. What component actually performs this work? Pump Reservoir Actuator Accumulator
A
Actuator
17
Q
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
A straight horizontal line
18
Q
Which component allows an actuator to maintain its pressure even after the pump stops? Directional control valve Check valve Reservoir Hose
A
Check valve
19
Q
This component stores energy in the form of pressurized gas: Accumulator Actuator Pump Reservoir
A
Accumulator
20
Q
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
A
2/2 way valve
21
Q
What is fluid movement called? Flow Pressure Resistance Energy
A
Flow
22
Q
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
A
Broaching machine
23
Q
T/F Before performing system maintenance, you should work the valves in all positions
A
True
24
Q
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
A
Cool completely
25
```
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
26
T/F if a high pressure hose breaks, it can continue flailing even when the pump has stopped operating.
True
27
T/F The accumulator can hold pressure to operating levels even when the pump isn't running.
True
28
```
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
29
T/F The most important concern when working in any type of manufacturing is safety
True
30
```
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
31
```
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
32
```
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
33
```
Always report any problems you find to:
Your supervisor
The maintenance team
Your coworkers
Research and development
```
The maintenance team
34
```
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
35
T/F following a maintenance program is the most effective way to prolong system life.
True
36
T/F Its a good idea to listen for unusual sounds from the system pump and report them to maintenance
True
37
```
Most contaminants, such as dirt, dust, debris, and water, enter the hydraulic system through the:
Reservoir
Valves
Filters
Dipstick
```
Reservoir
38
T/F No matter how careful you are, normal operations will admit some contaminants into the hydraulic system
True
39
```
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
40
```
To perform an out of circuit test, a component can be placed on a
Reservoir
Calibration tester
Test bench
Work cell
```
Test bench
41
```
When working around hydraulic equipment:
Wear loose fitting clothes
Wear canvas shoes
Remove any rings
Wear long sleeves
```
Remove any rings
42
```
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
43
```
_____ test ports allow you to take pressure measurements without breaking into a hydraulic line to install a tee
Line
System
In line
Valve
```
Valve
44
```
An increase in flow from the _____ can indicate excessive wear
Outlet of an actuator
Pump
Case drain
Motor
```
Case drain
45
```
Which method of flow measurement requires a shutoff valve to divert flow from the system through the flow meter?
Inline
Bypass
Isolation
Reroute
```
Bypass
46
```
A pressure change problem in a multiple pressure circuit is a _____ related fault.
Machine sequence
Machine performance
System
Machine execution
```
Machine sequence
47
```
Which of these forms of system level troubleshooting do experts recommend against using?
Symptom and cause
Half-split
Output back
Shotgun
```
Shotgun
48
```
Worn _____ in a cylinder can allow leakage that can result in slow actuator speed.
Cushions
Seals
Reverse flow checks
Sleeves
```
Seals
49
```
Fast actuator speed can by flow control valves, relief valves, and:
Pumps
POC valves
Counterbalance valves
DCVs
```
Pumps
50
T/F one of the major causes of incorrect deceleration is misadjustment of the deceleration components
True
51
What percent of all hydraulically powered machine downtime and malfunctions are due to contamination in the fluid?
More than 50%
52
```
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
53
```
A(n) _____ filter has a filter element enclosed inside a metal shield.
Spin-on
Cartridge-type
Suction strainer
Pump
```
Cartridge-type
54
```
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
55
```
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
