1) What sort of corrosion would a magneto be likely to encounter if completely enclosed? Report

Pitting

Direct chemical attack

None, providing the magneto is completely enclosed

2) What are the signs of fretting corrosion? Report

Flaking

Intergranular cracking

Black powder or cocoa staining

3) Black streaks back from a rivet hole signify Report

galvanic corrosion

intergrannular corrosion

fretting

4) When a steel part is welded, corrosion occurs because Report

it is affected by spatter

paint has been removed

the strip has become anodic

5) Intergranular corrosion Report

can be recognized by a grey powder deposit

may have no visual surface indication

can be recognized by its flaking and lifting of the material layers

6) From the following list of metals, which is most cathodic? Report

Nickel

Magnesium

Stainless steel

7) Intergrannular corrosion is caused by Report

improper heat treatment

dissimilar metal contact

improperly assembled components

8) Corrosion caused by electrolytic action is the result of Report

excessive anodization

the wrong quenching agent

contact between two unlike metals

9) Corrosion may be regarded as the destruction of metal by Report

electrochemical action

hydroelectric action

electromechanical action

10) Exfoliation corrosion is sometimes referred to as Report

layer corrosion

filiform corrosion

sub-surface corrosion

11) When dissimilar metals are brought together, or the same metal in different states, one metal forms the anode and the other the cathode. Which will suffer from corrosion? Report

The anode

The cathode

Both will corrode equally

12) In corrosion, the electrode that loses electrons is Report

the cathode

the anode

either the cathode or the anode depending upon the electrolyte

13) Which of these is a common cause of corrosion? Report

Water in fuel

Spilled battery acid

Untreated metal

14) What is stress corrosion? Report

Corrosion due to fretting

Corrosion in an area under cyclic loading

Corrosion in an area under continuous loading

15) Electrochemical reaction is caused by the contact of Report

bonding

dissimilar metals

moisture on the surface of the metal

16) Chemical attack is a direct result of Report

intergranular corrosion

filiform corrosion

cathodic & anodic changes in the material

17) Galvanic corrosion is caused by Report

incorrect heat treatments or incorrect alloying

cyclic stressing and a decrease in cross sectional area

the joining of 2 dissimilar metals

18) In the galvanic series, the most noble metal will, if joined to another metal Report

always be at the top of the table

corrode before the less noble metal

allow the less noble metal to corrode first

19) Stress corrosion is associated with Report

cyclic loading and a corrosion pit

a corrosion pit in a member under a compressive load

a corrosion pit in a member under stress

20) Corrosion will spread more rapidly when metals are exposed to Report

cold climates

high temperatures

dry climates

EASA Questions Module 6: Materials Set 7: Corrosion

Set 1: Materials - Ferrous

Set 2: Materials - Ferrous

Set 3: Materials - Non-Ferrous

Set 4: Composite & Non-Metal

Set 5: Wooden Structures

Set 6: Fabric Covering

Set 7: Corrosion

Set 8: Screw Threads

Set 9: Bolts, studs & screws

Set 10: Locking devices

Set 11: Rivets

Set 12: Pipes and Unions

Set 13: Bearings

Set 14: Transmissions

Set 15: Control Cables

Set 16: Electrical Cables