AIT Blueprint Reading 2 — Questions and Answers
Question 1: On a mechanical drawing, what does a hidden line typically look like?
- A solid continuous line
- A dashed or short-dash line (Correct answer)
- A long dash-dot line
- A wavy or jagged line
Correct answer: A dashed or short-dash line
Hidden lines are represented by dashed (short-dash) lines to show edges or features not visible from the current view.
Question 2: What is the purpose of a title block on a blueprint?
- To list all material quantities needed
- To provide project identification, scale, revision number, and drawing details (Correct answer)
- To show the sequence of assembly steps
- To indicate which tools are required for fabrication
Correct answer: To provide project identification, scale, revision number, and drawing details
The title block contains essential drawing information including the project name, drawing number, scale, revision history, and designer's name.
Question 3: What does the term 'scale 1:10' mean on a blueprint?
- The object is 10 times larger than shown
- One unit on the drawing equals 10 units on the actual object (Correct answer)
- The drawing has been reduced by 1%
- Every 10 mm on the object equals 1 mm on paper
Correct answer: One unit on the drawing equals 10 units on the actual object
A scale of 1:10 means one unit of measurement on the drawing represents 10 units on the real object.
Question 4: Which symbol on a weld blueprint indicates a fillet weld?
- A circle with a cross
- A right triangle (Correct answer)
- A square bracket
- A filled diamond
Correct answer: A right triangle
A right triangle (fillet) symbol placed on the reference line of a welding symbol indicates a fillet weld.
Question 5: In blueprint reading, what does 'OC' or 'O.C.' stand for?
- On Center (Correct answer)
- Outer Circumference
- Open Circuit
- Original Copy
Correct answer: On Center
'OC' stands for 'On Center,' indicating the distance measured from the center of one structural member to the center of the next.
Question 6: What type of line is used to show where a section view is cut on a blueprint?
- Object line
- Dimension line
- Cutting plane line (Correct answer)
- Leader line
Correct answer: Cutting plane line
A cutting plane line (typically a thick dash-dot line with arrows) shows the location and direction of a section cut.
Question 7: When reading an isometric drawing, how many axes are used to represent the three dimensions?
- Two axes at 90 degrees
- Three axes each at 120 degrees apart (Correct answer)
- Four axes in a cross pattern
- Three axes where one is vertical and two are horizontal
Correct answer: Three axes each at 120 degrees apart
Isometric drawings use three axes each separated by 120 degrees to give a 3D appearance on a 2D surface.
AIT Blueprint Reading 2
On a mechanical drawing, what does a hidden line typically look like?