4 - 5 Flashcards
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) All of the above
C) Adhesion
pg 1
A rapid rise in total bearing friction is cause by:
A) loss of fluid film
B) reduction in cohesion an increase in adhesion qualities of the lubricant
C) excessive heat
D) All of the above
D) ANY or All of the above
pg 4
The ideal lubricant is one that will:
A) carrying bearing load at max operating temp
B) maintain max adhesion at normal operating speeds
C) maintain proper degree of fluid friction
D) All of the above
D) All of the above
pg 4
Bearing lubricants:
A) reduce friction
B) carry away bearing heat
C) reduce wear or erosion of bearing surfaces
D) All of the above
D) All of the above
pg 8
Which one of the below statements concerning the effect of lubrication on anti friction 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) Bearings are protected against corrosion
A) The friction generally is lower when lubricated than when dry
*correct statement: the friction is slightly greater when lubricated than when dry
pg 7
The viscosity of an oil:
A) is a measure of its resistance to flow
B) determines the lid carrying ability under conditions of full fluid film lubricarion
C) affects power output and heat generation
D) All of the above
D) All of the above
pg 9
The viscosity of an oil is generally measured by a:
A) Manometer
B) Hydrometer
C) Viscosimeter
D) Channel point
C) Viscosimeter
pg 9
Which one of the below engine oils would have highest viscosity rating?
A) SAE 20
B) SAE 30
C) SAE 5W
D) SAE 50
D) SAE 50
pg 11
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
B) Viscosity index
pg 13
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
A) Harder than a number 2
pg 16
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
B) Bath
pg 19
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
A) Acid
pg 22
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 Above
D) Any or All of the above
pg 37
The ideal quantity of grease for an anti friction bearing on a shaft 2 1/2 in. 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
A) 1/3 to 1/2 full
pg 40
Centralized lubrication most nearly means:
A) All lubricants are stowed in a centralized location
B) All bearings 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.
D) The positive delivery of a predetermined amount of lubricant from one central point to a scattered number of lubrication points.
pg 41
