Introduction / Context:
Orthographic projection presents multiple views of a 3D object onto perpendicular planes. Space on the sheet and readability often require using a scale other than full size. This question checks whether scaling is consistent with orthographic rules.
Given Data / Assumptions:
- Views are orthographic (front, top, right) and adhere to first- or third-angle conventions.
- Scales such as 1:2, 2:1, or 1:5 are commonly used.
- Dimensions reflect actual size regardless of plotted scale.
Concept / Approach:
Orthographic projection is a geometric mapping independent of scale. Whether full-size or scaled, the projection preserves shape and angles (not perspective). The chosen scale is documented and does not change the underlying true dimensions; dimensions always state real values, not measured paper lengths.
Step-by-Step Solution:
Select a scale appropriate for sheet size and clarity.Apply the same scale to related views unless otherwise noted (detail views may differ).Place the scale note near the title block or view label.Confirm dimensions represent true values, independent of drawing scale.
Verification / Alternative check:
Compare dimension text to measured paper distance; they differ if not 1:1, which is expected and correct.
Why Other Options Are Wrong:
Incorrect: Scaling is standard and necessary on many drawings.Allowed only for architectural drawings / Valid only for detail views: Mechanical, civil, and electrical drawings routinely use scales across views.
Common Pitfalls:
Measuring the printed drawing with a ruler instead of trusting the dimension values.Using inconsistent scales without clear view-specific labels.
Final Answer:
Correct
Discussion & Comments