LESSON 5
PRACTICE EXERCISE
The following items will test your grasp of the material covered in this lesson. There is only one correct
answer for each item. When you have completed the exercise, check your answer with the key that
follows. If you answer any item incorrectly, study again that part which contains the portion involved.
1.
Metals that cannot be identified by visual examination or mechanical testing might be identified
through the use of a/an __________.
A.
Magnet
B.
Color number
C.
Grinder
D.
Acid spot test
2.
Where or when does metal corrosion begin?
A.
During milling
B.
On exposed surfaces
C.
Before coagulation
D.
In the metal core
3.
To protect a structure's surface, a sacrificial anode is applied. What corrosion-protection method
is being used?
A.
Concentration cell
B.
Differential
C.
Galvanic anode
D.
Impressed current
5-25
EN0562
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