Brainscape's Knowledge GenomeTM

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


See full index

NNIFID > Lubrication Theory > Flashcards

Lubrication Theory Flashcards

1
Q

Basic purposes of lubrication ?

A

Reduce friction, Wear, Corrosion, Dampen Shock, Provide Cooling, Minimize contaminates

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

Definition of Friction?

A

Force which acts between two surfaces to resist their sliding it rolling across each other

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

Describe different types of friction?

A

Static Friction- Exists between a body at rest
Kinetic Friction-exists between moving bodies

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

Dry Film

A

Natural lubricator(water vapor, oxide film, absorbed gases)

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

Mixed Film

A

Metal-metal contact
High degree of friction
Single layer of lubrication

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

Boundary Film

A

Some metal-metal contact
Thicker film layer
Startup/shutdown
Draws lubricant as component moves

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

Full Film

A

Surfaces completely covered with multiple layers

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

Full Film-hydrodynamic

A

Maintains separation of loaded surface
High pressure
High viscosity under increase load

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

Full Film-Hydrostatic

A

Film is provided from outside source

Used for slow, heavy loads

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

Oil wedge

A

Layer of oil that forms around journal when it starts rotating

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

What is needed for oil wedge to be created by?

A

Cohesion, Adhesion, and Viscosity

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

General classification of lubricants?

A

Liquid,Semisolid,Solid, Gas

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

Liquid lubricant

A

Mineral oils from crude oil

Oils from animal or vegetable fats

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
14
Q

Semisolid Lubricant

A

Greases made by thickening agent

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

Solid Lubricant

A

Teflon or graphoil

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

Gas Lubricant

A

Required for separation or high temps.

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

What make viscosity change?

A

Temps. Increases- viscosity lowers (think of water)
Press. Increases- Viscosity raises (syrup)

18
Q

Viscosity- Light oils

A

High speed
Low-Pressure
Low Temp.

19
Q

Viscosity-Heavy oils

A

Low speed
High pressure
High temperature

20
Q

Dynamic viscosity

A

Measure of force

21
Q

Kinematic Viscosity

A

Measure of velocity

22
Q

Flash point

A

Oil vaporized enough to ignite

Need spark or flame

23
Q

Fire point

A

Temp. when oil will continue to burn

Higher temp. than flash point

24
Q

Auto-Ignition

A

Flammable vapors from oil will burn without spark or flame

25
Q

Low flash point

A

Oil easily vaporized

26
Q

Properties of grease?

A

Light or heavy oil
Thickener(soap most common)
Additives(graphite,asbestos,zinc)

27
Q

Gravity/ drip feed

A

Lubricant above or beside point of required lubrication
Adjustable needle valve
Vibrating pin
Wick oiler

28
Q

Natural lubrication methods?

A

Splash Oilers & Ring Oilers

29
Q

Pressure / Force Feed lube methods?

A

Wet sump -internal to machine
Dry Sump-oil sump and pump external
AirLine lubricators- oil flows through Venturi and sprays oil mist

30
Q

Oil purification methods?

A

Gravity settling, Lube oil conditioner, and Varnish removal system

31
Q

Gravity settling

A

Simple but very slow
Large space requirements
Lube oil storage tanks

32
Q

Lube Oil conditioner

A

Removes water particulates from MTLO system by filtering action

33
Q

Varnish removal system

A

Removes soft contaminants that cause varnish (sludge)

34
Q

Symptoms Improper lubrication

A

High temp.
Vibration
Noisy Components
Eventual failure
Chemical decomposition
Contamination
Temp.
Inadequate flow
Excess water/air in oil

35
Q

Lubrication Inside storage ?

A

Storage lockers
Fireproof constructed rooms
All lubricants easily accessible
Markings clearly visible
Use older lubricants first

36
Q

Outside storage

A

55 gallon drum placed on sides and covered
Drum raised off ground(prevent corrosion)

37
Q

Safety handling lubricant

A

No smoking around lube storage
Adequate ventilation
Wear gloves,long sleeved shirts
Safety glasses avoid eye contact

38
Q

Oil spills

A

Pigs contain soak puddles
Oil absorbent container put under small leaks

39
Q

Call Environmental department when ?

A

Surface oil contamination
Ground water contamination
Air pollution

40
Q

Lubrication of plant equipment procedure?

A

Lubrication additions techniques
Topping off lubricant levels
Oil changes
Greasing bearings
What normal looks like

NNIFID (7 decks)

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