BME Engineering Drawing and CAD 1 — Questions and Answers
Question 1: In first-angle projection (used outside the US), the front view is projected:
- Onto the plane behind the object (Correct answer)
- Onto the plane in front of the object
- Directly below the object
- Above and to the right
Correct answer: Onto the plane behind the object
In first-angle projection, the object is between the observer and the projection plane, so the front view is cast onto the plane behind the object.
Question 2: The standard drawing projection method used in the United States is:
- First-angle projection
- Third-angle projection (Correct answer)
- Oblique projection
- Cabinet projection
Correct answer: Third-angle projection
Third-angle projection, identified by its symbol of a truncated cone with the small end toward the viewer, is the standard in the US per ASME/ANSI.
Question 3: A hidden line in engineering drawing is represented by:
- Continuous thick line
- Thin dashed line (Correct answer)
- Chain dotted line
- Wavy line
Correct answer: Thin dashed line
Hidden lines represent edges or outlines not visible from the current view and are drawn as thin dashed lines per standard drafting conventions.
Question 4: In GD&T, the symbol ⊙ represents:
- Flatness
- Circularity (roundness) (Correct answer)
- Cylindricity
- Concentricity
Correct answer: Circularity (roundness)
The circle symbol ⊙ in GD&T denotes circularity (roundness), which controls how close a cross-sectional circle is to a true perfect circle.
Question 5: A section view in a drawing is used to:
- Show external features only
- Reveal internal features by cutting through the part (Correct answer)
- Indicate surface finish
- Show the part in an assembled state
Correct answer: Reveal internal features by cutting through the part
A section view cuts through the object along a cutting plane to reveal internal features that would otherwise be hidden, improving clarity.
Question 6: The scale '1:2' on an engineering drawing means the drawing is:
- Twice the actual size
- Half the actual size (Correct answer)
- Full size
- 10 times the actual size
Correct answer: Half the actual size
A scale of 1:2 means one unit on the drawing equals 2 units on the actual object, so the drawing is half the true size.
BME Engineering Drawing and CAD 1
In first-angle projection (used outside the US), the front view is projected: