CDT Drawing Conventions & Standards 1 — Questions and Answers
Question 1: What organization publishes the National CAD Standard (NCS) used for construction drawing conventions in the U.S.?
- American Institute of Architects (AIA) alone
- Construction Specifications Institute (CSI) alone
- A collaborative effort of AIA, CSI, and the Construction Sciences Research Foundation (CSRF) (Correct answer)
- The National Institute of Building Sciences (NIBS)
Correct answer: A collaborative effort of AIA, CSI, and the Construction Sciences Research Foundation (CSRF)
The National CAD Standard is a collaborative publication of AIA, CSI, and CSRF (now NIBS) establishing uniform CAD drawing conventions for the U.S. AEC industry.
Question 2: What is the purpose of a drawing keynote system on construction documents?
- To number the sheets in the drawing set sequentially
- To reference construction materials or assemblies on drawings to a numbered legend, reducing repetitive text on the drawing (Correct answer)
- To track revision history on each drawing sheet
- To identify structural grid lines across the building plan
Correct answer: To reference construction materials or assemblies on drawings to a numbered legend, reducing repetitive text on the drawing
A keynote system uses numbered references on drawings tied to a keynote legend, keeping drawing sheets uncluttered while providing consistent material and assembly call-outs.
Question 3: In standard drawing sheet organization, which type of drawing is typically placed first in the set?
- Structural drawings
- Electrical drawings
- Architectural drawings, including the cover sheet and site plan (Correct answer)
- Mechanical drawings
Correct answer: Architectural drawings, including the cover sheet and site plan
Construction drawing sets are organized with architectural drawings (G/A sheets) first, followed by civil/structural, mechanical, plumbing, electrical, and specialty drawings.
Question 4: What does a section cut symbol on a floor plan indicate?
- The location of a structural column
- The cutting plane location and direction of view for a cross-section drawing (Correct answer)
- The centerline of a wall assembly
- The boundary of a fire-rated compartment
Correct answer: The cutting plane location and direction of view for a cross-section drawing
A section cut symbol marks the location of the imaginary cutting plane through the building and the arrows show the direction the viewer looks when examining the section drawing.
Question 5: What information is typically found in a drawing title block?
- Material specifications and product data
- Project name, drawing title, sheet number, scale, revision history, and firm information (Correct answer)
- Structural calculations and load tables
- Submittal review status and contractor approval
Correct answer: Project name, drawing title, sheet number, scale, revision history, and firm information
A title block contains identifying information for each sheet: project name, owner, design firm, drawing title, sheet number, scale, date, and revision history.
Question 6: What does a 'reference bubble' (drawing reference symbol) on a construction drawing do?
- Identifies a structural column location by grid intersection
- Directs the reader to a specific detail or section drawing on another sheet (Correct answer)
- Marks a revision cloud on an updated drawing
- Indicates a keynote reference to the specification section
Correct answer: Directs the reader to a specific detail or section drawing on another sheet
A reference bubble (circle with a line) contains a detail or section number and the sheet number where that drawing can be found, linking the reader across sheets in the drawing set.
CDT Drawing Conventions & Standards 1
What organization publishes the National CAD Standard (NCS) used for construction drawing conventions in the U.S.?