Corrosion Ex10

Question 1

What type of concentration cell corrosion occurs on the edge of an open faying surface?
A. Oxygen
B. Metal- Ion
C. Active-Passive

Answer 1

B. Metal-Ion

Question 2

What type of concentration cell corrosion occurs between layers on faying surface?
A. Oxygen
B. Metal-Ion
C. Active- passive

Answer 2

A. Oxygen

Question 3

A type of concentration cell corrosion would be…
A. Intergranular
B. Active- Passive
C. Exfoliation

Answer 3

B. Active Passive

Question 4

Applying zinc, chromate primer to an aluminum surface would have what effect?
A. It would prevent further corrosion by insulating the surface against electrolyte action.
B. It would form an organic layer on the surface.
C. It would cause the aluminum alloy core to corrode rapidly.

Answer 4

Be. It would form an organic layer on the surface.

Question 5

Zinc, chromate primer protects metal surfaces by…
A. Providing an impervious organic film.
B. The formation of a surface oxide film.
C. Preventing electrolytic action.

Answer 5

C. Preventing electrolytic action.

Question 6

The formation of an oxide film on the surface of aluminum has what effect?
A. The film insulate, the aluminum from any electrolyte (gas or liquid), and will not itself further react with the oxygen.
B. A porous or interrupted film is produced in the metal will continue to react with the oxygen.
C. It has no effect on the aluminum surface.

Answer 6

A. The film insulate the aluminum from any electrolyte (gas or liquid), and will not itself further react with the oxygen.

Question 7

The formation of red rust on a steel surface has what effect?
A. It forms a film that acts as a protective coating on a steel surface.
B. It presence actually promotes additional attack by attracting moisture from the air and act as a catalyst to promote additional corrosion.
C. It has no effect on the steel surface.

Answer 7

B. It’s presence actually promotes additional attack by attracting moisture from the air and acts as a catalyst to promote additional corrosion.

Question 8

The formation of red rust on which the following services would actually promote additional attack by attracting moisture from the air and act as a catalyst to remote additional corrosion.
A. Aluminum
B. Steel.
C. Magnesium.

Answer 8

B. Steel.

Question 9

What effect does oxidation have on the aluminum surface?
A. Stops corrosion.
B. Slows corrosion.
C. Promotes corrosion.

Answer 9

B. Slows corrosion.

Question 10

Which of the following materials, once oxidized, corrodes further (promotes corrosion)?
A. Iron
B. Aluminum.
C. Both a and B.

Answer 10

A. Iron

Question 11

Water (or moisture) in a Alclad aluminum surface creates a
A. Cathodic surface.
B. Anodic surface.
C. Neutral surface.

Answer 11

B. Anodic surface.

Question 12

If corrosion goes to a depth of .001 inch, what is the severity?
A. Light.
B. Moderate.
C. Severe.

Answer 12

A. Light.

Question 13

Which corrosion is “worm-like”?
A. Stress.
B. Filiform.
C. Pitting.

Answer 13

B. Filiform

Question 14

Filiform corrosion around fasteners (rivets) and at seams could develop into severe corrosion known as
A. Stress.
B. Intergranular.
C. Pitting

Answer 14

B. Intergranular.

Question 15

What is an advanced form of intergranular corrosion?
A. Pitting.
B. Exfoliation.
C. Delamination.

Answer 15

B. Exfoliation.

Question 16

Aluminum alloy sheets joined by spot Welding may be susceptible to corrosion. They’re joining of sheets by spot welding would result in what reaction?
A. Loss of alloying element
B. Grain enlargement.
C. Change in tensile strength.

Answer 16

B. Grain enlargement.

Question 17

Corrosion of aluminum sheets joined by spotwelding is the result of the entrance and entrapment of corrosion agents in what area?
A. Hidden concentration cell.
B. Between layers (or may say in layers or in metal layers).
C. Low point drain.

Answer 17

B. Between layers, in layers, in metal layers.

Question 18

When inspecting a ferromagnetic part with the magnetic particle method, which flaw would be indicated by either circular or longitudinal magnetism?
A. A transverse crack.
B. A crack at 45°.
C. A longitudinal correct

Answer 18

B. A crack at 45°.

Question 19

Which of the following would be used to detect a longitudinal crack with the magnetic particle method?
A. Circular magnetism.
B. Longitudinal magnetism.
C. Both a and B.

Answer 19

A. Circular magnetism.

Question 20

A major repair requires .3281 holes. If a 5/16 drill is selected for the job, the resulting holes would be.
A. Undersized.
B. Oversized.
C. Correct size.

Answer 20

A. Undersized.

Question 21

If an aluminum former is attached to a steel firewall with stainless steel rivets, what type of corrosion would occur?
A. Galvanic.
B. Filiform.
C. Pitting corrosion.

Answer 21

A. Galvanic.

Question 22

Black streaks on the elevator or aileron coming out of the hinges would be what type of corrosion?
A. Fretting.
B. Exfoliation.
C. Galvanic.

Answer 22

C. Galvanic.

Question 23

Galvanic corrosion is also known as
A. Dissimilar metals joined together
B . Intergranular corrosion.
C. Fretting corrosion.

Answer 23

A. Dis similar metals joined together.

Question 24

Which of the following abrasives could not be used to remove corrosion from aluminum alloys?
A. aluminum oxide
B. Silicone carbide.
C. Garnet.

Answer 24

B. Silicon carbide.

Question 25

Ferris alloys, 220,000 psi strength may have corrosion removed with certain abrasives. Which of the following should not be used on this type of metal? A. Garnet. B. Aluminum oxide. C. Silicon carbide.

Answer 25

A. Garnet.

Question 26

Ferrous alloys, 220,000 psi strength should have corrosion removed with which of the following materials? A. Garnet. B. Acid base stripper. C. Silicon carbide.

Answer 26

C. Silicon carbide.

Question 27

While performing a final inspection for the completion of a major repair to a composite structure, what would the correct orientation of the repair plies? A. Same as original. B. 100°. C. 90°

Answer 27

A. Same as original.

Question 28

When inspecting composites, Which ply of the original part is considered to be the reference or zero warp angle, which corresponds with the warp of the fabric? A. Center. B. Inner C. Outside.

Answer 28

C. Outside.

Question 29

Which NDT method should be used to detect intergranular corrosion? A. Visual inspection. B. Ultrasonic. C. Dye penetrate.

Answer 29

B. Ultrasonic.

Question 30

Which NDT method should not be used to detect cracks in advanced composite structures? A. Dye penetrant B. Ultrasonic. C. Both A and B.

Answer 30

A. Dye penetrant

Question 31

Where would intergranular corrosion most likely occur? A. Under the paint film. B. Inside the boundaries of the grains. C. Along the boundaries of the grains.

Answer 31

C. Along the boundaries of the grains.

Question 32

Where would exfoliation corrosion most likely occur? A. Under the paint film. B. In extruded materials. C. Where there are dissimilar metals.

Answer 32

B. In extruded materials.

Question 33

If delamination of a composite structure is not repaired (or corrected) what will result? A. broken fibers B. Matrix failure. C. Occlusions

Answer 33

A. Broken fibers.

Question 34

Low energy impact to a composite structure could result in what kind of damage? A. Broken fibers. B. Occlusions. C. Matrix failure.

Answer 34

A. Broken fibers.

Question 35

When working with composites, the warp direction (orientation) is designated at 0°. When inspecting a composite structure, typically what is the warp orientation of the surface or top ply? A. 0° B. 45°. C. It would be specified by the manufacturer.

Answer 35

C. It would be specified by the manufacturer.

Question 36

When working with composites, the warp direction (orientation) is 0°. What direction would the tracer run? A. 45°. B. 90° C. 0°

Answer 36

C. 0°

Question 37

As the holder of a IA, you are inspecting a major repair to a composite elevator skin. The approved data indicates the first supply of the laminate is at 0° warp angle. At what angle would you expect the warp tracer? A. 0° B. 40° C. 90°

Answer 37

A. 0°

Question 38

How would you identify compression failure in an aircraft wooden (rectangular wing) spar? A. Radical cracks. B. Fine line running parallel with the grain of wood. C. Fine line running perpendicular with the grain of wood.

Answer 38

C. Fine line running perpendicular with the grain of wood.

Question 39

You, As an IA, are performing an inspection on a wooden aircraft and notice dark spots (stains) in the wood how do you determine if there’s any damage? A. Probe with sharp object (or pointed object). B. Coin tap test. C. Green bromide solution test (chemical test)

Answer 39

A. probe with a sharp or pointed object

Question 40

Delamination and debonding in composite structures can be detected by which of the following methods? A. Coin tap test. B. Visual inspection. C. Both A and B.

Answer 40

A. Coin tap test

Question 41

Which of the following could a coin or ring tap test be used to detect in a composite structure? A voids and occlusions B. Delamination and occlusions. C. Delamination, Debonding and voids.

Answer 41

C. Delamination, Debonding and voids

Question 42

Cracks and other flaws within composite structure, materials can be detected by which of the following methods? A. Coin tap test. B. Ultrasonic inspection. C. Both A and B.

Answer 42

B. Ultrasonic inspection.

Question 43

Delamination, voids, flaws and debonding within composite structure materials can be detected by which of the following methods? A. Coin tap test B. Ultrasonic inspection. C. Both A and B.

Answer 43

B. Ultrasonic inspection.

Question 44

Which NDT method should be used for detecting voids, delaminations, occlusions, resin rich or resin lean ((starvation) conditions? A. Ultrasonic. B. Dye penetrant C. Coin tap test.

Answer 44

A. Ultrasonic.

Question 45

Filiform corrosion develops A. Only under the paint film. B. On the grain boundaries of the metal. C. Only in cracks and crevices.

Answer 45

A. Only under the paint film.