Placement of concentric dimension lines: Should shorter dimension lines be placed nearest the object outline, with longer ones staggered outward?

Introduction / Context:When multiple dimensions radiate from the same area, their placement order affects readability. Standards recommend a clear inside-to-outside arrangement so witness and extension lines do not cross excessively and the dimension text remains legible.

Given Data / Assumptions:

• Several related dimensions must be shown from the same feature, such as step heights or concentric diameters.
• Space near the object is limited.
• Good drafting practice seeks clarity and minimal line crossings.

Concept / Approach:The best practice is to place the smallest or innermost size closest to the feature, then step outward with progressively longer dimension lines. This ordering reduces overrun of extension lines and makes the drawing easier to scan. The statement that longer lines belong closest to the object inverts this rule and would create clutter.

Step-by-Step Solution:

Verification / Alternative check:Compare two sketches: one with shortest-near-object vs. longest-near-object. The former has fewer crossings and improved readability, confirming the recommended order.

Why Other Options Are Wrong:

Common Pitfalls:Squeezing large text too close to the part; letting extension lines overlap notes and callouts; failing to maintain consistent gaps between stacked dimension lines.

Final Answer:Correct