AIT Technical Drawing 2 — Questions and Answers
Question 1: What does a hidden line represent in a technical drawing?
- A surface that is visible from the viewing angle
- An edge or surface not visible from the current view (Correct answer)
- A center axis of a cylindrical feature
- A dimension reference line
Correct answer: An edge or surface not visible from the current view
Hidden lines (dashed lines) represent edges or surfaces that exist but cannot be seen from the current viewing direction.
Question 2: Which type of section view is used when only one half of a symmetrical part needs to be shown in section?
- Full section
- Half section (Correct answer)
- Broken-out section
- Revolved section
Correct answer: Half section
A half section cuts away one quarter of a symmetrical object, showing the interior on one half and the exterior on the other.
Question 3: In GD&T, what does the flatness symbol control?
- How parallel one surface is to a datum
- How flat a surface is regardless of any datum (Correct answer)
- The perpendicularity of a surface to a datum
- The straightness of a single line element
Correct answer: How flat a surface is regardless of any datum
Flatness controls all points of a surface to lie within two parallel planes and requires no datum reference.
Question 4: What is the purpose of a revision block on a technical drawing?
- To list all materials used in the part
- To record changes made to the drawing after original release (Correct answer)
- To show the scale of the drawing
- To identify the drafting software used
Correct answer: To record changes made to the drawing after original release
The revision block documents each change to a drawing, including the revision letter, description, date, and approval.
Question 5: A leader line on a technical drawing is used to:
- Connect dimension lines to extension lines
- Point from a note or symbol to the feature it describes (Correct answer)
- Show the boundary of a section cut
- Indicate the direction of a surface finish
Correct answer: Point from a note or symbol to the feature it describes
Leader lines connect notes, part numbers, or symbols to the specific feature or area they reference on the drawing.
Question 6: When a dimension is shown as '2X Ø.500', what does '2X' indicate?
- The tolerance is doubled
- The feature appears twice and both must be the same size (Correct answer)
- The scale of the view is 2:1
- The measurement is in millimeters
Correct answer: The feature appears twice and both must be the same size
The '2X' prefix means the dimension applies to two identical features, indicating both must conform to the specified size.
Question 7: Which projection method places the front view in the center, the top view above, and the right-side view to the left of the front view?
- First-angle (European) projection (Correct answer)
- Third-angle (American) projection
- Oblique projection
- Axonometric projection
Correct answer: First-angle (European) projection
First-angle projection, used in Europe and many other countries, projects views as if the object is between the viewer and the projection plane.
AIT Technical Drawing 2
What does a hidden line represent in a technical drawing?