ITMC Blueprint Reading 2

Question 1

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

Accepted Answer

An edge or feature not visible from the current viewing angle

Answer

Hidden lines (dashed) show edges or features that exist behind visible surfaces in the current view.

Question 2

What is the purpose of a revision block on an engineering drawing?

Accepted Answer

To record changes made to the drawing after its initial release

Answer

The revision block documents changes, dates, and descriptions of modifications made to a drawing after original issue.

Question 3

A first-angle projection differs from third-angle projection primarily in that:

Accepted Answer

The view is placed on the opposite side from where the observer looks

Answer

In first-angle projection (common in Europe), the view is projected onto the plane beyond the object, opposite to the observer's side.

Question 4

On a blueprint, the symbol GD&T uses for flatness is:

Accepted Answer

Two parallel horizontal lines

Answer

The GD&T flatness symbol is two parallel horizontal lines, indicating that a surface must lie within two parallel planes.

Question 5

What does 'MAX' written next to a dimension on a blueprint indicate?

Accepted Answer

The feature must not exceed that value

Answer

'MAX' indicates an upper limit — the manufactured feature must be at or below that value.

(ITMC) Industrial Technology Maintenance Certification Practice Test