According to BIS SP 46-2003, which of the following applications is correctly represented by a chain-thin line in engineering drawings?

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According to BIS SP 46-2003, which of the following applications is correctly represented by a chain-thin line in engineering drawings?

This question was previously asked in

RRB NTPC 2024 Undergraduate CBT 1 Question Paper (29-Aug-2025) (Shift 1)

Hidden edges

Dimension lines

Visible edges

Center lines

The correct answer is

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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