ACtE04 · Chapter 4Computer Organization & Embedded Systems🏛️ Past Licensure QuestionID: 71e7da59
The value of the ratio of isometric projection length to true length is:
The value of the ratio of isometric projection length to true length is:
Multiple Choice Options
- A
0.141
- B
0.372
- C✓ Correct Option
0.815
- D
0.642
Detailed Technical Solution & Explanation
In isometric projection, the object is oriented so that the three principal axes make equal angles with the projection plane. The foreshortening ratio (isometric length / true length) is:
This is approximately 0.815 (or ~0.816), meaning all three axes are equally foreshortened to about 81.5% of their true length in an isometric projection.
Option Analysis:
•
Option A (0.141): Incorrect — far too small; would represent extreme foreshortening.
•
Option B (0.372): Incorrect — does not correspond to any standard projection ratio.
•
Option C (0.815): ✅ Correct. √(2/3) ≈ 0.8165 ≈ 0.815.
•
Option D (0.642): Incorrect — does not correspond to the isometric foreshortening factor.
Reference: Mock Test 04NEC Licensure Syllabus