Chapter 4- Libricants

Question 1

What is the relationship, loads, and speed when considering the needed this viscosity ratings of lubricants

Answer 1

Lighter loads, higher speeds, low temp
NEED LOW VISCOSITY

Heavy loads slow speeds high temp
NEED HIGH VIACOSITY

Question 2

Define viscosity

Answer 2

Property of liquid that causes it to resist flow

Question 3

Define viscosity index

Answer 3

Measure of the rate at which viscosity changes as temperature changes

Question 4

Pour point

Answer 4

Point at which lubricant is so thick it doesn’t flow

Question 5

Flashpoint

Answer 5

Minimum temperature that a lubricant will give off vapor but not catch fire

Question 6

Fire point

Answer 6

Minimum point at which a lubricant will burn continuously

Question 7

What is an oxidation inhibitor

Answer 7

Additive that slows the rate of a lubricants tendency to oxidize

Question 8

What does Detergent do for lubricants

Answer 8

Holds tiny particles, too small to be filtered in suspension to help keep metal surfaces clean from deposit

Question 9

What do extreme pressure additives duo for lubricants and where are they commonly found

Answer 9

They increase load carrying ability of lubricant
Most effective at reducing friction and wear at high temps
Found in Gear lubricants

Question 10

Name for main lubricated film conditions

Answer 10

1.dry friction condition
2.full lubrication film (static or dynamic
3 mixed lubricant film
4. Boundary lubrication film

This is in order of heavier loads
Elastohydrodynamic-between full and mixed

Question 11

Difference between hydrodynamic and hydrostatic lubrication

Answer 11

Hydro dynamic is where rotation of shaft and coating action keep it in place

Hydrostatic is where outside pressure keeps lubricant in place

Question 12

Name the three main types of industrial lubricating oil’s

Answer 12

Animal/vegetable
Mineral/petroleum
Synthetic

Question 13

Name two advantages of Grease over oil

EXTRA CREDIT!!!

Answer 13

Stays in place

Withstands higher temps

Less Maintenance

Allows bearings to be sealed

Question 14

Lubricating greases I made up of petroleum base and of thickening agent called

Answer 14

Soap

Question 15

Five rules for good grease lubrication

Answer 15

1.Correct type of grease
2.Correct intervals lubricating
3.Correct type grease applying equipment
P4.roper method of Greece lubrication
Correct amount

Question 16

What is the primary function of any lubricant

Answer 16

Preevent metal to metal contact of moving sliding or rolling surfaces

Question 17

Primary use and types of lubrication

Answer 17

K

Question 18

Explain difference between grease and oil

Answer 18

J

Question 19

Properties of librication fluids

Answer 19

B