Millwright Certification Blueprint Reading 1

Question 1

On a mechanical drawing, what does a dashed (hidden) line represent?

Accepted Answer

An edge or feature not visible from the current viewing angle

Answer

A surface that requires special finishing

Answer

A centerline axis for a rotational part

Answer

A phantom position showing alternate movement

Question 2

A drawing title block shows the scale '1:4'. What does this mean for the physical part?

Accepted Answer

One unit on the drawing equals four units on the part

Answer

The part is four times smaller than drawn

Answer

The part is four times larger than drawn

Answer

Four copies of the part are required

Question 3

What does the surface finish symbol '√' (check-mark shape) with a number value indicate on a mechanical drawing?

Accepted Answer

The maximum allowable surface roughness in microinches or micrometers

Answer

The surface must be painted after machining

Answer

The minimum hardness required at that surface

Answer

The surface must be inspected with dye penetrant

Question 4

In third-angle projection (standard in North America), where is the right-side view placed relative to the front view?

Accepted Answer

To the right of the front view

Answer

Directly above the front view

Answer

To the left of the front view

Answer

Directly below the front view

Question 5

On a mechanical drawing, what does a phantom line (long dash, two short dashes, repeating) typically represent?

Accepted Answer

An alternate position of a moving part or a repeated feature

Answer

A surface that will be removed in a later operation

Answer

A weld joint between two components

Answer

The boundary of a machined area

Question 6

A drawing callout reads 'Ø25 ±0.05'. What is the maximum allowable finished diameter of this shaft?

Accepted Answer

25.05 mm

Answer

24.95 mm

Answer

25.00 mm

Answer

25.10 mm