2ND 4

Question 1

The property which causes fluid lubricants to stick to solid bearings, or the force that attracts fluids to solids is:

a) cohesion
b) magnetism
c) adhesion
d) a combination of all three

Answer 1

c) adhesion

Question 2

A rapid rise in total bearing friction is caused by:

a) a loss of the fluid film
b) a reduction in cohesion and an increase in the adhesion qualities of the lubricant
c) excessive heat
d) any or all of the above

Answer 2

d) any or all of the above

Question 3

The ideal lubricant is one that will:

a) carry the bearing load at the maximum operating temperature
b) maintain maximum adhesion at normal operating speeds
c) maintain the proper degree of fluid friction
d) all three

Answer 3

d) all three

Question 4

Bearing lubricants:

a) reduce friction
b) carry away bearing heat
c) reduce wear or erosion of bearing surfaces
d) all three of the above

Answer 4

d) all three of the above

Question 5

Which one of the below statements concerning the effect of lubrication on anti-friction bearing is not true:

a) the friction generally is lower when lubricated than when dry
b) sliding friction is reduced
c) a better seal is maintained
d) bearing are protected against corrosion

Answer 5

a) the friction generally is lower when lubricated than when dry

Question 6

The viscosity of an oil:

a) is a measure of its resistance to flow
b) determines the load carrying ability under conditions of full fluid film lubrication
c) affects power output and heat generation
d) all of the above

Answer 6

d) all of the above

Question 7

The viscosity of an oil is generally measured by a:

a) manometer
b) hydrometer
c) viscosimeter
d) channel point

Answer 7

c) viscosimeter

Question 8

Which one of the below engine oils would have highest viscosity rating:

a) SAE 20
b) SAE 30
c) SAE 5W
d) SAE 50

Answer 8

d) SAE 50

Question 9

The rate of change in the viscosity of an oil for a given temperature change refers to its:

a) viscosity rating
b) viscosity index
c) channel point
d) penetration number

Answer 9

b) viscosity index

Question 10

A grease with a consistency number of 6 is:

a) harder than a number 2
b) softer than a number 2
c) used on bearings with small clearances
d) generally used for lightly loaded bearings

Answer 10

a) harder than a number 2

Question 11

The type of flood oil system used when the lubricated surfaces are to be always submerged in oil is:

a) circulation
b) bath
c) ring
d) splash

Answer 11

b) bath

Question 12

Which of the below items that affect the ability of an oil to perform properly cannot be removed by a centrifuging process:

a) acid
b) water
c) dirt
d) metallic particles

Answer 12

a) acid

Question 13

Grease is used in preference to oil to lubricate certain types of plain bearings because:

a) it minimizes leakage
b) it reduces throw
c) it provides an effective seal
d) any or all of the above

Answer 13

d) any or all of the above

Question 14

The ideal quantity of grease for an anti-friction bearing on a shaft 2 ½ inches in diameter would be:

a) 𝟏/𝟑 to 𝟏/𝟐 full
b) 1/2 to 3/4 full
c) 3/4 to full
d) completely full at all times

Answer 14

a) 𝟏/𝟑 to 𝟏/𝟐 full

Question 15

Centralized lubrication most nearly means:

a) all lubricants are stowed in a centralized location
b) all bearing are lubricated by the same person
c) all bearings receive the same type of lubricant
d) the positive delivery of a predetermined amount of lubricant from one central point to a scattered number of lubrication points.

Answer 15

d) the positive delivery of a predetermined amount of lubricant from one central point to a scattered number of lubrication points.