MODULE 3 (2.2) - LUBRICANT PARAMETERS

Question 1

is a quantitative measure of a fluid’s resistance to flow

Answer 1

Viscosity

Question 2

it determines the fluid strain rate that is generated by a given applied shear stress

Answer 2

Viscosity

Question 3

For common fluids like oil, water and air, the relationship between shear stress and the resulting shear strain rate is

Answer 3

linear

Question 4

In the limit of infinitesimals, the shear strain rate is ____ to the velocity gradient:

Answer 4

equal

Question 5

the applied shear is also ______ to the velocity gradient, by a proportionality constant 𝜇

Answer 5

proportional

Question 6

Acronym Meaning

SUS

Answer 6

Saybolt Universal Seconds

Question 7

it is the efflux time required for 60 milliliters of a petroleum product to flow through the calibrated orifice of a Saybolt Universal viscometer under a carefully controlled temperature and as prescribed by test method ASTM D 88 Standard Test Method for Saybolt Viscosity

Answer 7

Saybolt Universal Seconds

Question 8

Acronym Meaning

ASTM

Answer 8

American Society for Testing Materials

Question 9

Standard Classification of Industrial Fluid Lubricants by Viscosity System

Answer 9

ASTM D2422

Question 10

Acronym Meaning

ISO

Answer 10

International Organization for Standardization

Question 11

Acronym Meaning

SAE

Answer 11

Society of Automotive Engineers

Question 12

Acronym Meaning

AGMA

Answer 12

American Gear Manufactures Association

Question 13

VISCOSITY-TEMPERATURE RELATIONS:

Viscosity of mineral oil rapidly ______ with increasing temperature

Answer 13

decreases

Question 14

the _______ the VI, the least is it affected by increasing temperature and the smaller the change in viscosity

Answer 14

greater

Question 15

commonly used to indicate the relative decrease in viscosity with increasing temperature

Answer 15

Viscosity Index

Question 16

a ___ VI fluid experiences a large swing in viscosity as temperature changes

Answer 16

low

Question 17

the viscosity of the fluid decreases as the shear rate increases

Answer 17

Shear Thinning Fluid

Question 18

example includes ketchup, paints and blood

Answer 18

Shear Thinning Fluid

Question 19

also called pseudo plastics

Answer 19

Shear Thinning Fluid

Question 20

fluid becomes less viscous the greater the force you exert on it

Answer 20

Shear Thinning Fluid

Question 21

the viscosity of the fluid increases as the shear rate increases

Answer 21

Shear Thickening Fluid

Question 22

example include mixture of cornstarch and water, called oobleck

Answer 22

Shear Thickening Fluid

Question 23

also called dilatant

Answer 23

Shear Thickening Fluid

Question 24

the harder and faster you push it, the more it pushes back or the more resistance you feel

Answer 24

Shear Thickening Fluid