404c Failure and Fluid Analysis

Question 1

Failure analysis can only be applied to the mechanical repair of individual parts or components.
T/F

Answer 1

false

Question 2

Prior to inspection, metal specimens taken from a failure must be thoroughly cleaned, preferably with a power wire wheel.
T/F

Answer 2

false

Question 3

Fluid analysis information is best utilized under what kind of maintenance program?

Answer 3

predictive maintenance program

Question 4

The higher the carbon content in steel, the more malleable it will be.
T/F

Answer 4

false

Question 5

Case hardening of a shaft will:

Answer 5

impact mainly the surface layers of the steel.

Question 6

A metal fracture surface that indicates several beach marks and a final fracture area is best described as:

Answer 6

a fatigue fracture.

Question 7

A metal fracture surface that indicates sudden fractures following the molecular boundaries of the material is best described as:

Answer 7

a brittle fracture.

Question 8

Wear characterized by scraping of cuts and gouges into the surface without indications of heat is best described as:

Answer 8

abrasive wear.

Question 9

Wear that is identified as material wear or removal that occurs over time from vibration without lubricant is best described as:

Answer 9

false brinelling.

Question 10

Wear that appears as surface cracks and surface pitting and is commonly found on roller and ball bearings is best described as:

Answer 10

surface fatigue wear.

Question 11

Wear commonly found in positive displacement hydraulic pumps with a restricted inlet is:

Answer 11

erosive wear.

Question 12

Three (3) classifications of stress found in mechanical parts of equipment are:

Answer 12

• tension
• compression
• torsion

Question 13

The internal mechanical stress that acts at 90° to the lines of force and tends to enlarge this dimension is described as:

Answer 13

compression stress.

Question 14

Drive shafts are subjected mainly to:

Answer 14

torsion stress.

Question 15

Most failures of mechanical parts are due to:

Answer 15

operational conditions.

Question 16

Fluid analysis data is commonly used to indicate three (3) conditions of concern. What are they?

Answer 16

• product deterioration
• wear rates of internal components
• external contamination

Question 17

Most mechanical failures are due to failure of the petroleum product.
T/F

Answer 17

false

Question 18

Resistance to flow at a fixed temperature by a petroleum product is defined as:

Answer 18

viscosity.

Question 19

Low oil sump operating temperature should be considered if:

Answer 19

water is present in sample.

Question 20

High wear of brass bushings would be indicated in an oil analysis as high ppm of:

Answer 20

copper and zinc.

Question 21

Dust and dirt left inside an engine or housing during repair will be indicated in an oil analysis as:

Answer 21

silicon.

Question 22

Boron and sodium found in an oil sample in high ppm indicates:

Answer 22

antifreeze.