Brainscape's Knowledge GenomeTM

Browse over 1 million classes created by top students, professors, publishers, and experts.


See full index

Hydraulics > Hydraulic System Components Reservoir Filters Hoses And Coolers > Flashcards

Hydraulic System Components Reservoir Filters Hoses And Coolers Flashcards

0
Q

The quality of the hydraulic oil will depend on how well the liquid will:

A
  • Prevent rust
  • Prevent the formation of sludge varnish and gum
  • Retain its stability for an acceptable period Of time
  • Maintain its this viscosity over a wide temperature range
  • Prevent corrosion and pitting
  • Allow water to settle out and be compatible with gaskets and seals
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
1
Q

The power required to force the fluid through the lines and the system components is simply a power loss that shows up as what?

A

heat

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
2
Q

What is viscosity?

A

Viscosity of a liquid is a measure of its internal resistance to flow

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
3
Q

What measures the force per-unit area required to move two parallel surfaces that are separated with a given film thickness of oil?
And what is the common unit used for this measurement?

A

Absolute viscosity

Centipoise (cP)

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
4
Q

What measures the amount of time required for a given volume of oil to flow through a capillary tube and what is the unit of measure?

A

kinematic viscosity

Centistoke (cSt)

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
5
Q

What measures the amount of time required for a given quantity of oil to flow through a standard orifice while being held at a specific test temperature and what is the unit of measure?

A

Relative viscosity

Saybolt Universal seconds (SUS)

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
6
Q

What device is commonly used to measure relative viscosity?

A

Saybolt viscometer

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
7
Q

What does the pour point of hydraulic oil refer to?

A

The lowest temperature at which oil will flow

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
8
Q

When the clearance between the moving parts is sufficient to allow the film of oil two completely separate them this condition is called?

A

Full film lubrication

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
9
Q

Minute surface imperfections are known as what?

A

Asperities

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
10
Q

What is the most significant factor that influences the degration of oil?

A

Oxidation

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
11
Q

The rate of hydraulic oil oxidation depends on:

A

The amount of air the oil is exposed to
The temperature of the oil
The chemical makeup of the oil

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
12
Q

The rate at which hydraulic oil oxidizes will double with every 10°C increase in temperature above ……?

A

60°C

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
13
Q

What are the major functions performed by the hydraulic reservoir in a hydraulic system?

A
  • Hold the system oil supply
  • Cool the oil
  • Allow Air and contamination to separate from the oil
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
14
Q

The process of allowing solid contamination to settle out of the oil is known as what?

A

Sedimentation

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
15
Q

What are the processes that condition the hydraulic oil while in the hydraulic tank before it re-enters the system?

A

De-aeration and sedimentation.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
16
Q

Vented hydraulic reservoirs allow atmospheric pressure to act on the surface of the oil.

True or false?

A

True

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
17
Q

Another commonly used method of pressurizing a hydraulic reservoir is to use a pressure cap on the filler. What is the approximate air pressure that the relief holds in the reservoir?

A

10-15psi

69-103kpa

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
18
Q

As hydraulic pressure increase, internal clearances are reduced, to control___________

A

Internal Leakage

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
19
Q

Internal clearances in low pressure hydraulic components run about (Microns)

A

10 to 20 Microns (a micron is one millionth of a meter or 0.000039 in)

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
20
Q

Internal Clearances of a high pressure components run at how many microns?

A

5 Microns

21
Q

Reducing internal clearances also reduces the thickness of the ____ ______ that lubricates moving parts.

A

Oil Flim

22
Q

It is estimated that approximately ____ of hydraulic systems failures are caused by poor hydraulic oil conditioning.

A

80%

23
Q

Solid Contamination in the hydraulic oil interfere with system operation by? (3 Answers)

A
  • Restricting or plugging orifices and small passages
  • forming sludge that inhibits cooling and sticks moving parts
  • affecting the lubricating ability of the hydraulic oil resulting in damage to precision surfaces of components parts
24
Q

Contamination in hydraulic oil originates from three sources?

A
  1. Built in contamination
  2. Ingressed contamination
  3. Internally Generated Contamination
25
Q

Contamination usually takes the form in these 12 forms

A

burrs, chips, dirt, dust, fibers, sand, moisture, sealants, welding splatter, paints, rust and flushing solutions.

26
Q

Ingressed contamination refers?

A

to contamination that is introduced to the system when it is being serviced

27
Q

Internally generated contamination is a result of particles being removed from the?

A

internal surfaces of the hydraulic system components

28
Q

When working on or around hydraulic systems, remember the following.

A
  1. The filtration system cannot do it all.
  2. Dirt is everywhere
  3. The Cleaner your work habits, the longer the service life of system components
29
Q

Full-Flow type filters?

A

Will receive and condition the full flow rate of the pump

30
Q

Course filtration devices, often called strainers are usually made of and are rated by?

A
  1. Woven wire screen

2. mesh or sieve number

31
Q

whats a microns measurement?

A

one millionth of a metre or 0.000039”

32
Q

What are the four types of filter rating?

A
  1. Filter Rating
  2. Absolute Rating
  3. Nominal Rating
  4. Beta Rating
33
Q

Strainers are most commonly used in the?

A

Pump Inlet line

34
Q

pressure line filters are installed downstream of the pump and so they must be able to withstand ___ _______ _______?

A

Full system pressure

35
Q

Filter Bypass devices and restriction indicators have to important qualities?

A
  1. Oil Viscosity

2. Filter Media Permeability

36
Q

What are the three types of hydraulic conductors (system plumbing) used?

A
  1. Steel Pipe
  2. Steel Tubing
  3. Hydraulic Hose
37
Q

How do you measure these types of pipe

  1. Pipe
  2. Tubing
  3. Hydraulic Hose
A
  1. ID
  2. OD
  3. ID
38
Q

Joint Industrial Council (JIC) are used on flare angles of?

A

37 Degrees (used more in hydraulic systems)

39
Q

Society of Automotive Engineers (SAE) are used at angles of?

A

45 Degrees (used more in air brake systems)

40
Q

What 3 things determine what the hydraulic hose is intended for?

A
  1. System Pressure
  2. compatibility with hydraulic oil
  3. the environment the hose will be in
41
Q

List four functions of hydraulic oil?

A
  1. Transmit Power
  2. Lubricate moving parts
  3. seal close fitting parts
  4. cool the system
42
Q

The term viscosity refers to an oil’s

A

Internal resistance to flow

43
Q

Viscosity index refers to

A

the amount that the oil’s viscosity changes with temperature

44
Q

boundary lubrication refers to the condition where

A

minute imperfections on the surfaces of moving parts are in contact.

45
Q

Three factors that will determine how quickly hydraulic oil with oxidize are.

A
  1. the amount of air that the oil is exposed to
  2. the oil temperature
  3. the chemical make up of the oil
46
Q

The most important consideration when selecting a hydraulic oil is

A

Manufacturers specifications

47
Q

3 functions of hydraulic oil reservoir are?

A
  1. Hold the system oil supply
  2. cool the oil
  3. allow the air and contamination to settle out of the oil
48
Q

Pressurized reservoirs are used in applications where

A

the pump inlet line may not otherwise be filled with oil.

49
Q

the greatest amount of component wear is caused by contamination that is

A

the same size or smaller than component internal clearances

50
Q

the filtering device most commonly used in the pump inlet line is

A

100 mesh strainer

51
Q

hydraulic oil coolers are usually connected in _____ in the system _______line.

A

series/return

Hydraulics (4 decks)

Brainscape helps you reach your goals faster, through stronger study habits.
© 2024 Bold Learning Solutions. Terms and Conditions