According to BIS SP 46-2003, which of the following applications is correctly represented by a chain-thin line in engineering drawings?
Center lines
According to BIS SP 46-2003 (Indian Standard for Engineering Drawing Practices), a chain-thin line is used to represent center lines in engineering drawings. Center lines indicate the axis of symmetry or the center of a circular or symmetrical feature. They are represented by alternating long and short dashes, creating a chain-like appearance.
Let's examine why the other options are incorrect:
- Hidden edges: Hidden edges are represented by dashed lines (short dashes).
- Dimension lines: Dimension lines are thin, continuous lines with arrowheads at their ends, used to indicate measurements.
- Visible edges: Visible edges are represented by continuous thick lines.
Therefore, only center lines fit the description of a chain-thin line as specified in BIS SP 46-2003.
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