CD CD Drafter Structural & Mechanical Systems

Question 1

In structural drafting, what does a dashed line running along the center of a beam or column typically represent?

Accepted Answer

The centerline or neutral axis of the member

Answer

A centerline (long-short-long dash pattern) marks the axis of symmetry or center of structural members such as beams and columns.

Question 2

What type of structural connection allows rotation between members but resists shear and axial loads?

Accepted Answer

Pin connection

Answer

A pin connection resists both shear and axial forces but allows rotation, making it a common idealized support in structural analysis.

Question 3

On a mechanical assembly drawing, what does a balloon with a number inside, connected by a leader line, indicate?

Accepted Answer

A part number referencing the bill of materials

Answer

Balloons on assembly drawings identify individual parts by their item number, which corresponds to rows in the bill of materials.

Question 4

A W8×31 designation on a structural drawing refers to:

Accepted Answer

A wide-flange I-beam with a nominal depth of 8 inches and weight of 31 lb/ft

Answer

Wide-flange (W-shape) designations use depth in inches × weight per linear foot, so W8×31 is 8 inches deep and weighs 31 lb/ft.

Question 5

What is the function of a gusset plate in a structural steel connection?

Accepted Answer

To reinforce and transfer loads between connected members

Answer

Gusset plates are flat steel plates welded or bolted at joints to distribute and transfer loads between intersecting structural members.

(CD) Certified Drafter Practice Test