Failure and Fluid Analysis 190404c

Question 1

1. Failure analysis can only be applied to the mechanical repair of individual parts or
   components.
   a) true
   b) false

Answer 1

b) false

Question 2

2. Prior to inspection, metal specimens taken from a failure must be thoroughly cleaned,
   preferably with a power wire wheel.
   a) true
   b) false

Answer 2

b) false

Question 3

3. Fluid analysis information is best utilized under a:
   a) analytical maintenance program.
   b) failure maintenance program.
   c) preventative maintenance program.
   d) predictive maintenance program.

Answer 3

d) predictive maintenance program

Question 4

4. The higher the carbon content in steel, the more malleable it will be.
   a) true
   b) false

Answer 4

b) false

Question 5

5. The properties of a metal component such as toughness, hardness, brittleness or
   ductility, are a result of:
   a) carbon content of the steel.
   b) heat treatment during manufacturing.
   c) special metallic processes .
   d) all of the above.

Answer 5

d) all of the above

Question 6

6. Case hardening of a shaft will:
   a) impact mainly the surface layers of steel.
   b) impact the entire cross sectional area of the shaft.
   c) strengthen only the core of the shaft.
   d) prevent annealing.

Answer 6

a) impact mainly the surface layers of steel.

Question 7

7. A metal fracture surface that indicates several beach marks and a final fracture area is
   best described as:
   a) a ductile fracture.
   b) a fatigue fracture.
   c) a brittle fracture.
   d) a beach fracture.

Answer 7

b) a fatigue fracture.

Question 8

8. A metal fracture surface that indicates sudden fractures following the molecular
   boundaries of the material is best described as:
   a) a ductile fracture.
   b) a fatigue fracture.
   c) a brittle fracture.
   d) a shear fracture.

Answer 8

c) a brittle fracture

Question 9

9. Wear characterized by scraping of cuts and gouges into the surface without
   indications of heat is best described as:
   a) adhesive wear.
   b) surface fatigue wear.
   c) abrasive wear.
   d) erosive wear.

Answer 9

c) abrasive wear.

Question 10

10. Wear that is identified as material wear or removal that occurs over time from
    vibration without lubricant is best described as:
    a) adhesive wear.
    b) true brinelling.
    c) surface wear.
    d) false brinelling.

Answer 10

d) false brinelling.

Question 11

11. Wear that appears as surface cracks and surface pitting and is commonly found on
    roller and ball bearings is best described as:
    a) bearing surface wear.
    b) rolling surface wear.
    c) surface fatigue wear.
    d) metal erosive wear.

Answer 11

c) surface fatigue wear.

Question 12

12. Wear commonly found in positive displacement hydraulic pumps with a restricted
    inlet is:
    a) adhesive wear.
    b) abrasive wear.
    c) surface fatigue wear.
    d) erosive wear.

Answer 12

d) erosive wear.

Question 13

13. Three (3) classifications of stress found in mechanical parts of equipment are:
    a)
    b)
    c)

Answer 13

a) tension
b) compression
c) torsion

Question 14

14. The internal mechanical stress that acts at 90° to the lines of force and tends to
    enlarge this dimension is described as:
    a) torsion stress.
    b) compression stress.
    c) tension stress.
    d) bending stress.

Answer 14

b) compression stress.

Question 15

15. Drive shafts are subjected mainly to:
    a) tension stress.
    b) compression stress.
    c) bending stress.
    d) torsion stress.

Answer 15

d) torsion stress.

Question 16

16. Most failures of mechanical parts are due to:
    a) manufacturing faults.
    b) faulty material casting .
    c) improper installation.
    d) operational conditions.

Answer 16

d) operational conditions.

Question 17

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

Answer 17

a) product deterioration
b) wear rates of internal components
c) external contamination

Question 18

18. Most mechanical failures are due to failure of the petroleum product.
    a) true
    b) false

Answer 18

b) false

Question 19

19. Resistance to flow at a fixed temperature by a petroleum product is defined as:
    a) viscosity index.
    b) viscosity .
    c) SAE grades.
    d) flow-temperature index.

Answer 19

b) viscosity.

Question 20

20. Low oil sump operating temperature should be considered if:
    a) oil analysis indicates oil is too thick (high solid content).
    b) oil viscosity is reduced.
    c) oil flash point is decreased.
    d) water is present in sample.

Answer 20

d) water is present in sample.

Question 21

21. High wear of brass bushings would be indicated in an oil analysis as high ppm of:
    a) copper and zinc.
    b) copper and tin.
    c) brass and copper.
    d) tin and silver.

Answer 21

a) copper and zinc.

Question 22

22. Dust and dirt left inside an engine or housing during repair will be indicated in an oil
    analysis as:
    a) silver.
    b) iron.
    c) barium.
    d) silicon.

Answer 22

d) silicon.

Question 23

23. Boron and sodium found in an oil sample in high ppm indicates:
    a) special additives.
    b) grease contamination.
    c) commercial additive.
    d) antifreeze.