Which term describes a dimension that repeats a given dimension or is established from other values shown on a drawing, typically enclosed in parentheses?

Which term describes a dimension that repeats a given dimension or is established from other values shown on a drawing, typically enclosed in parentheses?

• A. Aligned Dimension
• B. Baseline Dimension
• C. Reference Dimension
• D. Nominal Size

Answer: (C)

Reference dimensions are information-only measurements on a drawing. They may repeat a dimension that’s already shown or be derived from other values on the drawing, and they’re typically enclosed in parentheses to signal that they aren’t used to manufacture or inspect the part. This is why the correct term is reference dimension. The other types have different roles: an aligned dimension follows the feature’s direction, a baseline dimension uses a common starting line for multiple dimensions, and nominal size is the intended size used for planning and tolerancing rather than for deriving values.

Reference dimensions are information-only measurements on a drawing. They may repeat a dimension that’s already shown or be derived from other values on the drawing, and they’re typically enclosed in parentheses to signal that they aren’t used to manufacture or inspect the part. This is why the correct term is reference dimension. The other types have different roles: an aligned dimension follows the feature’s direction, a baseline dimension uses a common starting line for multiple dimensions, and nominal size is the intended size used for planning and tolerancing rather than for deriving values.