Chapter 31

Question 1

What is boundary lubrication

a) A situation where surfaces are fully separated by a thick film of lubricant. b) A situation where surfaces are separated by a thin film of lubricant.
c) A situation where no lubricant is present between surfaces.
D) A situation where surfaces are separated by a layer of gas.

Answer 1

B

Question 2

Fluid film lubrication, also known as __________, occurs when the lubricating film between surfaces is thick enough to completely separate the surfaces

a) boundary lubrication
b) mixed lubrication
c) elastohydrodynamic lubrication
d) flood lubrication

Answer 2

D

Question 3

Anti-friction bearings consist of moving components which roll between two surfaces called:
A. Races
B. Tracks
C. Grooves
D. Valleys

Answer 3

A

Question 4

All ______ must be cleaned from the outside of the bearing and the shaft.

a) oil
b) dirt
c) grease
d) water

Answer 4

B

Question 5

Bearings can withstand operating temperatures up to blank
Options:
A) 200°C
B) 150°C
C) 120°C
D) 85°C

Answer 5

C

Question 6

When does boundary lubrication typically occur?

a) When there is an excess supply of lubricant.
b) When lubricant supply is limited.
c) When there is no need for lubrication. d) When surfaces are cooled to low temperatures.

Answer 6

B

Question 7

What happens to friction and wear in boundary lubrication?

a) Friction and wear are completely eliminated.
b) Friction and wear increase significantly.
c) Friction and wear are reduced if the surfaces are covered by the film.
d) Friction and wear remain unaffected

Answer 7

C

Question 8

What kind of contact occurs between surfaces during boundary lubrication?

a) No contact at all.
b) Full metal-to-metal contact.
C) Partial metal-to-metal contact.
D) Contact through a solid barrier.

Answer 8

C