CDT CDT Structural & Mechanical Drafting 2

Question 1

Which projection method is standard in the United States for engineering drawings?

Accepted Answer

Third-angle projection

Answer

Third-angle projection is the standard method used in the US, where the view is placed on the same side as the observer relative to the part.

Question 2

What does a centerline (alternating long and short dashes) represent on a mechanical drawing?

Accepted Answer

The axis of symmetry or center of a circular feature

Answer

Centerlines mark the axis of symmetry of a part, the center of holes or cylinders, or the pitch circle of bolt patterns.

Question 3

A bill of materials (BOM) on a mechanical assembly drawing typically includes which information?

Accepted Answer

Item number, part number, description, quantity, and material

Answer

A BOM is a structured list that includes each item's number, part number or drawing number, description, quantity required, and often material specification.

Question 4

In structural drafting, what does a break line indicate?

Accepted Answer

That a long part has been shortened and the middle portion removed from the view

Answer

Break lines are used when a long uniform object is too large to draw at full scale; the middle is removed and the ends are brought together with a break symbol.

Question 5

What is a revision block (revision history) on an engineering drawing used for?

Accepted Answer

Tracking changes made to the drawing after initial release

Answer

The revision block records each change made to the drawing after release, including the revision letter/number, description of change, date, and approver.

(CDT) Certified Drafting Technician Practice Test

(CDT) Certified Drafting Technician Practice Test

CDT CDT Structural & Mechanical Drafting 2