Materials & Equipment Knowledge Flashcards
7 cards from real CDT practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.
Read the first 7 Materials & Equipment Knowledge flashcards as text
When using an electric erasing machine in technical drafting, what accessory is used to limit erasure to a specific area without damaging surrounding linework?
Answer: Erasing shield
An erasing shield is a thin metal or plastic sheet with various shaped openings that exposes only the line or area to be erased while protecting adjacent lines.
What is the primary reason drafting tape is preferred over masking tape for securing drawings to a board?
Answer: Drafting tape has lower tack to avoid damaging the drawing when removed
Drafting tape has a low-tack adhesive that holds drawings securely during work but releases cleanly without tearing the paper or leaving residue.
In manual drafting, what is the purpose of a proportional divider?
Answer: To scale measurements up or down by a set ratio between two ends
A proportional divider has an adjustable pivot point so one end spans a measured distance while the other automatically spans that distance multiplied or divided by the set ratio.
Which lead grade would produce the lightest, hardest line suitable for layout and construction lines?
Answer: 4H
4H is a very hard lead that produces light, fine lines ideal for preliminary construction lines that may be erased or will not reproduce on prints.
What drafting tool is specifically designed for drawing curves of varying radii that are all tangent to a single point?
Answer: Irregular curve (French curve)
French curves (irregular curves) contain sections of various conic sections and curved shapes, allowing the drafter to match the curve edge to the desired portion of the drawing.
For a CAD workstation used in drafting, what specification most directly affects the speed of displaying and rotating complex 3D models?
Answer: Dedicated graphics card (GPU) memory and performance
A dedicated GPU with its own VRAM handles the real-time rendering calculations required for rotating and displaying complex 3D CAD geometry smoothly.
Architect's scales typically include which of the following representative fractions?
Answer: 3/32"=1'-0", 1/8"=1'-0", 1/4"=1'-0"
Architect's scales use fractional inch-to-foot ratios such as 3/32", 1/8", 3/16", 1/4", 3/8", 1/2", 3/4", 1", 1-1/2", and 3" per foot.