Day 11 Progress Check Flashcards

1
Q

What is the purpose of using a vacuum forming technique in the shaping of complex curves in transparent plastics?

A

To ensure uniform thickness and strength of the plastic.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
2
Q

During the cleaning process of transparent plastics, why should harsh chemicals be avoided?

A

They can cause crazing and weaken the material.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
3
Q

Which of the following is a key consideration when installing windshields to ensure proper fit and performance?

A

Using gaskets and mounting hardware to distribute stress and ensure waterproofing.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
4
Q

Which of the following steps is NOT recommended during the cementing process of transparent plastics?

A

Applying cement at temperatures below 65°F.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
5
Q

In the context of transparent plastic repairs, what is crazing?

A

The formation of fine cracks on the surface due to overstressing.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
6
Q

When storing transparent plastic sheets, why should they be kept away from direct sunlight?

A

To prevent adhesive deterioration and potential damage.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
7
Q

Which type of cement is commonly used for its clear, stable joints in transparent plastic repairs?

A

Polymerizable cement like PS-30®

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
8
Q

Why is it crucial to maintain the protective masking on transparent plastic sheets for as long as possible?

A

To prevent surface damage during handling and storage.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
9
Q

What is the primary reason for avoiding direct heating methods like hot water or steam when forming transparent plastics?

A

They cause uneven heating, leading to potential material stress and deformation.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
10
Q

What is a crucial safety consideration when cutting and drilling transparent plastics?

A

Using high-speed, low-feed rates to prevent heat build-up and material damage.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
11
Q

Which forming technique is recommended for creating simple curves in transparent plastics?

A

Drape heating over a form and allowing to cool without forcing.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
12
Q

What is the primary disadvantage of using thermosetting plastics in applications requiring reshaping?

A

They cannot be remelted and reshaped once set.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
13
Q

During the repair of minor cracks in transparent plastics, what is the purpose of drilling holes at the ends of the cracks?

A

To prevent further propagation of the cracks.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
14
Q

Which military specification applies to craze-resistant acrylics used in aircraft windows and canopies?

A

MIL-P-8184

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
15
Q

Which of the following statements best describes the primary difference between thermoplastics and thermosetting plastics?

A

Thermoplastics can be remelted and reshaped, while thermosetting plastics cannot.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly