Technical Drawing & Blueprint Interpretation Flashcards

What does a centerline (alternating long and short dashes) indicate when applied to a circular feature?

Answer: The axis or center of symmetry of the circular feature

Centerlines mark the axis of symmetry, center of circles, paths of motion, or pitch circles of gears.

On a drawing with the note 'SCALE 1:2', an object drawn 50 mm long represents an actual size of:

Answer: 100 mm

A 1:2 scale means the drawing is half actual size, so 50 mm on paper equals 100 mm in reality.

Which type of sectional view shows only half the object in section and half in exterior view, separated by a centerline?

Answer: Half section

A half section cuts only one quarter of the object, revealing interior on one side and exterior on the other, divided by the centerline.

In GD&T, the symbol for flatness tolerance is:

Answer: Two parallel horizontal lines

The flatness symbol is two parallel horizontal lines, indicating that a surface must lie within two parallel planes separated by the tolerance value.

An isometric drawing differs from a perspective drawing primarily because:

Answer: Isometric lines remain parallel and do not converge to vanishing points

In isometric drawings, parallel edges remain parallel and are drawn at true scale, whereas perspective drawings converge toward vanishing points.

On a wiring or electrical schematic blueprint, dashed lines between components typically represent:

Answer: Mechanical linkage or enclosure boundaries

Dashed rectangles or lines on electrical schematics usually indicate mechanical enclosures, panels, or linkages — not electrical connections.

What does the abbreviation 'MAX' beside a dimension indicate on a technical drawing?

Answer: The feature must not exceed the stated value

'MAX' means the feature size or dimension must not exceed the given value, setting an upper limit.