CDT Technical Drawing & Blueprint Interpretation 3

Question 1

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

Accepted Answer

The axis or center of symmetry of the circular feature

Answer

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

Question 2

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

Accepted Answer

100 mm

Answer

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

Question 3

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

Accepted Answer

Half section

Answer

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

Question 4

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

Accepted Answer

Two parallel horizontal lines

Answer

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

Question 5

An isometric drawing differs from a perspective drawing primarily because:

Accepted Answer

Isometric lines remain parallel and do not converge to vanishing points

Answer

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

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