CDT CDT Structural & Mechanical Drafting 1 — Questions and Answers
Question 1: In structural steel drafting, what does the designation W12×50 indicate?
- A 12-foot length weighing 50 pounds total
- A wide-flange beam approximately 12 inches deep weighing 50 pounds per linear foot (Correct answer)
- A 12-inch web with 50-inch flanges
- A wall thickness of 12 mm at 50 ksi yield
Correct answer: A wide-flange beam approximately 12 inches deep weighing 50 pounds per linear foot
The W designation indicates a wide-flange shape; W12×50 means the nominal depth is approximately 12 inches and the weight is 50 pounds per linear foot.
Question 2: Which view in a mechanical assembly drawing shows internal features by imagining a cutting plane through the part?
- Auxiliary view
- Section view (Correct answer)
- Detail view
- Isometric view
Correct answer: Section view
A section view reveals internal features by showing a cross-section of the part as if it were cut by an imaginary plane.
Question 3: A welding symbol with a filled triangle below the reference line indicates:
- A groove weld on the arrow side
- A fillet weld on the arrow side (Correct answer)
- A plug weld
- A spot weld
Correct answer: A fillet weld on the arrow side
A filled triangle (fillet weld symbol) placed below the reference line means the fillet weld is to be placed on the arrow side of the joint.
Question 4: In US structural drafting, what does the abbreviation 'TYP' mean when placed next to a dimension?
- Temperature yield point
- Tolerance yield parameter
- Typical — applies to all similar features (Correct answer)
- Top yield priority
Correct answer: Typical — applies to all similar features
TYP stands for 'typical' and indicates that the noted dimension or detail applies to all identical or similar features on the drawing.
Question 5: What is the purpose of a detail drawing in mechanical drafting?
- To show the complete assembly of all parts
- To provide manufacturing information for a single individual part (Correct answer)
- To illustrate the overall project scope
- To list all bill of materials items
Correct answer: To provide manufacturing information for a single individual part
A detail drawing fully describes a single part with all dimensions, tolerances, materials, and notes required to manufacture that part.
Question 6: In a structural drawing, a dashed hidden line represents:
- A centerline of a symmetrical feature
- An edge or feature that is not visible in the current view (Correct answer)
- A section cut line
- A reference dimension
Correct answer: An edge or feature that is not visible in the current view
Hidden lines, drawn as dashed lines, represent edges or contours of a part that exist but are not visible from the current viewing direction.
CDT CDT Structural & Mechanical Drafting 1
In structural steel drafting, what does the designation W12×50 indicate?