404c Failure and Fluid Analysis Flashcards
Failure analysis can only be applied to the mechanical repair of individual parts or components.
T/F
false
Prior to inspection, metal specimens taken from a failure must be thoroughly cleaned, preferably with a power wire wheel.
T/F
false
Fluid analysis information is best utilized under what kind of maintenance program?
predictive maintenance program
The higher the carbon content in steel, the more malleable it will be.
T/F
false
Case hardening of a shaft will:
impact mainly the surface layers of the steel.
A metal fracture surface that indicates several beach marks and a final fracture area is best described as:
a fatigue fracture.
A metal fracture surface that indicates sudden fractures following the molecular boundaries of the material is best described as:
a brittle fracture.
Wear characterized by scraping of cuts and gouges into the surface without indications of heat is best described as:
abrasive wear.
Wear that is identified as material wear or removal that occurs over time from vibration without lubricant is best described as:
false brinelling.
Wear that appears as surface cracks and surface pitting and is commonly found on roller and ball bearings is best described as:
surface fatigue wear.
Wear commonly found in positive displacement hydraulic pumps with a restricted inlet is:
erosive wear.
Three (3) classifications of stress found in mechanical parts of equipment are:
- tension
- compression
- torsion
The internal mechanical stress that acts at 90° to the lines of force and tends to enlarge this dimension is described as:
compression stress.
Drive shafts are subjected mainly to:
torsion stress.
Most failures of mechanical parts are due to:
operational conditions.
Fluid analysis data is commonly used to indicate three (3) conditions of concern. What are they?
- product deterioration
- wear rates of internal components
- external contamination
Most mechanical failures are due to failure of the petroleum product.
T/F
false
Resistance to flow at a fixed temperature by a petroleum product is defined as:
viscosity.
Low oil sump operating temperature should be considered if:
water is present in sample.
High wear of brass bushings would be indicated in an oil analysis as high ppm of:
copper and zinc.
Dust and dirt left inside an engine or housing during repair will be indicated in an oil analysis as:
silicon.
Boron and sodium found in an oil sample in high ppm indicates:
antifreeze.
