Chapter 10 - Lubricants

Question 1

Lubricants

Answer 1

Reduces the friction by substituting fluid friction for solid friction

Question 2

Full-film Lubrication

Answer 2

Lubricant completely separates the two surfaces.

Question 3

Boundary Lubrication

Answer 3

Separation is incomplete.

Used when film between mating surfaces becomes too thin to prevent contact.

Question 4

Lubricant Forms

Answer 4

Gaseous - helium, argon, inert gases
Solid - synthetic, mineral powders
Liquid - fatty oils, mineral and synthetic oils
Cohesive - paste, grease, waxes, soaps

Question 5

Most Common substance added to oil

Answer 5

Soap Thickeners

Question 6

Lubricant Application

Answer 6

Petroleum- based and synthetic oils
Greases
Solid lubricants
Combinations

Question 7

Lubrication Methods

Answer 7

Manual
Oil bath and splash
drop-feed oiler system
pressurized lubrication

Question 8

Lubrication systems

Answer 8

Boundary
Mixed-film
Full-fulm
Hydrostatic

Question 9

Bearings lubricated with oil

Answer 9

Ball bearing
Cylindrical bearing
Needle roller
Spherical at high speeds
Tapered roller

Question 10

Bearings lubricated with grease

Answer 10

Plain bearings

Spherical at lower speeds