Test on Aircraft Metallic Structure Repair

Question 1: Is it important to remove all traces of welding flux after welding aluminum or magnesium?

A. Ano

B. Ne

Explanation: Welding flux is corrosive, and it must be removed to keep the metal from corroding.

Question 2: What is the primary reason for keeping the pressure of the gas in an acetylene cylinder low?

A. To prevent the flame from becoming too soft for welding.

B. Acetylene gas becomes unstable when kept under pressure exceeding approximately 15 psi.

C. To ensure the bead penetrates the material sufficiently for a butt weld.

D. To avoid the need for preheating thick metal plates before welding.

Explanation: Acetylene gas becomes unstable when it is kept under pressure of more than about 15 psi, which is why it is important to keep the pressure low.

Question 3: Anodizing is applied to aluminum alloy by a spray-on coating process.

A. Ano

B. Ne

Explanation: Anodizing is a protective oxide film that is deposited on the surface of aluminum alloy by an electrolytic process, not a spray-on coating process.

Question 4: The study materials state that the general rule for determining the proper rivet pitch is three-fourths of the pitch of the rivets in the rows.

A. Ano

B. Ne

Explanation: The study materials state "Three-fourths of the pitch of the rivets in the rows" but do not define it as the general rule for determining proper rivet pitch. The materials define the general rule for finding the proper rivet diameter as "Three times the thickness of the thickest sheet."

Question 5: According to the study materials, under what condition should countersinking be performed when installing flush rivets in a piece of sheet metal?

A. When the thickness of the sheet is less than the thickness of the rivet head.

B. Only when the thickness of the sheet is greater than the thickness of the rivet head.

C. When the thickness of the sheet is exactly equal to the thickness of the rivet head.

D. When the thickness of the sheet is at least three times the rivet diameter.

Explanation: Countersinking should be done only when the thickness of the sheet is greater than the thickness of the rivet head.