Wear

Question 1

When obtaining facts related to failure analysis, the facts must include information from?

a) questions related to component systems
b) qualitive and quantitative questions
c) visual examination with and without magnification
d) all of the above

Answer 1

d) all of the above

Question 2

The majority of wear type failures are usually related to?

a) cavitation
b) contact stress fatigue
c) fretting corrosion
d) abrasion

Answer 2

d) abrasion

Question 3

Scratches in-line with component motion are usually characteristics of?

a) adhesive wear
b) erosion
c) small particle abrasive wear
d) two body abrasive wear

Answer 3

small particle abrasive wear

Question 4

Large particles such as dirt, aluminum chips and core sand are usually?

a) abrasive particles entering the product during operation or maintenance
b)results of adhesive wear
c)results of tow body abrasive wear
d)material remaining from repair or original manufacturing

Answer 4

d)material remaining from repair or original manufacturing

Question 5

The fastest progressing wear type?

a) abrasive wear
b) adhesive wear
c) corrosion
d) sliding contact stress fatigue

Answer 5

b) adhesive wear

Question 6

The first sign of adhesive wear is?

a) a melted surface
b) material transfer from a soft surface to a hard surface
c) polishing and smearing of a weaker surface
d) formation of deep scratches and gouging of the surfaces

Answer 6

c) polishing and smearing of a weaker surface

Question 7

Cavitation erosion occurs when?

a) hard particles in fast moving fluids contact surrounding surfaces at high speeds
b) wearing surfaces are misaligned and concentrate normal stresses
c) two surface make contact and transfer material from a soft surface to a hard surface
d) low pressure vapor bubbles form and implode on a surface due to a pressure rise

Answer 7

d) low pressure vapor bubbles form and implode on a surface due to a pressure rise

Question 8

when rolling contact stress fatigue occurs, fatigue cracks?

a) form at the surface and grow inward until pitting occurs
b) form sub-surface due to cyclic flexing and join together progressing to the surface
c) allow surface material to spall
d) both b & c

Answer 8

d) both b & c

Question 9

The terms cathode and anode are terms typically used with?

a) abrasive wear
b) adhesive wear
c) corrosion wear
d) sliding contact stress fatigue

Answer 9

c) corrosion wear

Question 10

Fretting corrosion occurs when?

a) two surfaces make contact and transfer material from a soft surface to a hard surface
b)two slightly fit parts move slightly micro weld small surface irregularities
c) different material types located within an acidic environment
d) metal is heated allowing the atomic structure to mix with oxygen atoms and separate

Answer 10

b)two slightly fit parts move slightly micro weld small surface irregularities