Lubrication & Anti-Friction Bearings (Set 1)

1. The term "pour point" is defined as the lowest temperature at which lubricating oils will flow ______________.

rapidly

by gravity

through a standard orifice at a specified temperature

at a rate of 60cc per second

2. Which of the following statements is used to describe the term "base" in reference to greases?

Texture of the grease under load.

Temperature at which the grease softens or melts.

Type of soap used in its production.

Temperature below which the grease will be ineffective as a lubricant.

3. A grease lubricated ball bearing or roller bearing will run cooler if the grease ______________.

fills only 10% of all void spaces within the bearing

has a high grease penetration number (is hard)

is thinned with a suitable lubricating oil

is heated prior to packing the bearing

4. In a compression type grease cup, the lubricant is forced into the bearing by ______________.

gravity flow

spring force

a pressure gun

a zerk fitting

5. Which of the processes listed consumes the greatest amount of power while producing the greatest amount of heat?

Overcoming sliding friction

Overcoming rolling friction

Overcoming fluid friction

Overcoming oil wedge friction

6. The packing installed in the pump stuffing box is lubricated by ______________.

gravity and feed oil cups

grease cups

hand during installation

leakage through the stuffing box

7. An organic solid lubricant, such as graphite, is suitable as an oil additive when used in ______________.

machinery bearings subjected to high temperatures

antifriction bearings on general service pumps

bearings subject to fluctuating loads

line shaft bearings

8. The best method of fixing a winch motor bearing of the sealed type that is running hot is to ______________.

add grease through the zerk fitting

allow the winch to run at slower speeds only

replace the bearing with a new one

apply a light oil to the bearing housing

9. Adsorption filters are not commonly used in steam turbine or diesel engine lubricating systems because they ______________.

utilize exotic and expensive filtering media making them too costly for use.

are only effective at temperatures below 37.8°C

can adsorb no more than five times their weight in water

remove additives from the lube oil

10. Although lube oils used in the main lubricating service systems should have a relatively high flash point to avoid ignition, they can create smoke and fire hazards when they ______________.

are exposed to a vacuum

come in contact with extremely hot surfaces

are reduced in temperature to just above the pour point

become extremely agitated or aerated

Lubrication & Anti-Friction Bearings (Set 1)

Multiple Choice Questions