PHEP 5

Question 1

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

Answer 1

Adhesion

Question 2

A rapid rise in total bearing friction is caused by

Answer 2

A loss of the fluid film, excessive heat, reduction and cohesion, and an increase in the adhesion qualities of the lubricant, all the above

Question 3

The ideal lubricant is one that will

Answer 3

All three, maintain maximum adhesion at normal, operating speed, maintain the proper degree of fluid friction, carry the bearing load at the maximum operating temperature

Question 4

Bearing lubricants:

Answer 4

All three, reduce friction, carry away bearing heat, reduce where or erosion of bearing surfaces

Question 5

Which one of the below statements concerning the effect of lubrication on antifriction bearing’s is not true?

Answer 5

The friction generally is lower when lubricated then when dry

Question 6

The viscosity of an oil

Answer 6

Is a measure of its resistance to flow, effects, power, output, and heat generation, determines the load, carrying ability under conditions of full fluid film lubrication, all the above

Question 7

The viscosity of an oil is generally measured by a

Answer 7

Viscosimeter

Question 8

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

Answer 8

SAE 50

Question 9

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

Answer 9

Viscosity index

Question 10

Grease with the consistency number of six is:

Answer 10

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

Answer 11

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

Answer 12

Acid

Question 13

Greece is used in a preference to oil to lubricate certain types of plain bearings because

Answer 13

And minimizes leakage, reduces throw, provides an effective seal, all the above

Question 14

The ideal quantity of grease for an anti-friction bearing on a shaft, 2 1/2 inches in diameter would be

Answer 14

1/3- 1/2 full

Question 15

Centralized lubrication most nearly means

Answer 15

The positive delivery of a predetermined amount of lubricant from one central point to a scattered number of lubricant points