lubrication

Question 1

3 types of friction

Answer 1

sliding
rolling
fluid

Question 2

which of the 3 friction has the most friction

Answer 2

sliding

Question 3

which of the 3 friction has the least friction

Answer 3

fluid

Question 4

what is the property of reducing friction

Answer 4

lubricity

Question 5

type of lubricant film is thick enough to completely seperate the surface with a continuous film

Answer 5

full film lubricant

Question 6

extremely high pressure causes viscosity to (icrease/decrease)

Answer 6

increase

Question 7

type of full film lubricant , film completely separates two surfaces however the two surfaces are loaded to the extent that deformation takes place in the loaded area

Answer 7

elasto hydrodynamic film lubricant

Question 8

type of lubricant film does not completely separate so some of the asperities touch

Answer 8

boundary film lubricant

Question 9

type of lubricant film
forms at low speeds
forms when the visocosity of the lubricant is too low to support the load
forms if there is not enough lubricant

Answer 9

boundary film lubricant

Question 10

type of lubricant film
offers least friction resistant
eliminates wear on the moving surfaces
generates the least amount of heat

Answer 10

full film lubricant

Question 11

what happens to support area of a bearing as clearance increases

Answer 11

support area decreases

Question 12

whats happens to support area of a bearing as clearance decreases

Answer 12

support area increases

Question 13

thickness of hydrodynamic film is affected by the 3

Answer 13

speed
viscosity
load pressure

Question 14

3 facts that affect viscosity

Answer 14

temperature
pressure
speed

Question 15

water has a high/low viscosity

Answer 15

low

Question 16

tar has a high/low viscosity

Answer 16

high

Question 17

viscosity is measured iin

Answer 17

centistoke and SUS (saybolt universal seconds)

Question 18

tempurature increase =viscosity

Answer 18

decrease

Question 19

pressure increase = viscosity

Answer 19

increase

Question 20

shear increase is also know as

Answer 20

surface speed increase

Question 21

absolute viscosity is measured in

Answer 21

centipoises

Question 22

the term for direct measurement of the force of resistance to flow in a fluid

Answer 22

absolute viscosity

Question 23

a number that identifies the amount of change in the viscosity of a lubricant over a temperature range

Answer 23

viscosity index

Question 24

the lowest temperature at which an oil is observed to flow

Answer 24

pour point

Question 25

the lowest temperature at which the vapour above an oil ignites when a flame is passed over it

Answer 25

flash point

Question 26

oil engine grade indicted by a W

Answer 26

low temperature engine grade

Question 27

10W-30 is an example of what engine grade

Answer 27

multigrade

Question 28

oil derived from base stock produced at the refineries

Answer 28

petroleum based

Question 29

oil with high wax content

Answer 29

paraffin base

Question 30

oil used as base oil in cold temperature

Answer 30

naphtha base

Question 31

what percent of oil do additives make up

Answer 31

22%

Question 32

oil oxidization rate doubles for every 8 degrees above what degree

Answer 32

55 degrees celsius

Question 33

oil inhibitor reacts with metal

Answer 33

chemical

Question 34

oil inhibitor attracted to metal surfaces

Answer 34

physical

Question 35

stiffness of grease is known as

Answer 35

consistancy

Question 36

4 types of oil lubrication systems

Answer 36

bottle lubrication
wick feed
drip feed
ring or chain oilers