NivaarExam PrepOfficial exam papers ↗

04-BS-15 · Undated paper

Question 4 of 5: Section view of a stepped hub/pulley

Nivaar worked solution (AI-drafted; not reviewed by a licensed engineer)

Notes on this paper

Basic Studies / 04-BS-15 — Engineering Graphics & Design Process, undated. Closed-book, no calculator, 3 hours, 100 marks; five questions constitute a complete exam paper (answer ALL five). All sketches are freehand technical drawings following third-angle projection (CSA B78.1 / ASME Y14.5) unless the question calls for isometric pictorial or sectioning conventions.

Reference texts: Bertoline & Wiebe, Technical Graphics Communication (4th ed.) — orthographic projection, isometric pictorials, auxiliary/section views, third-angle projection; Giesecke, Technical Drawing / Engineering Graphics (15th ed.) — ASME Y14.5 dimensioning, CSA B78.1 drafting practice, sectioning conventions, glass-box projection theory.

Question 4: Section view of a stepped hub/pulley (10 marks)

Question text not reproduced: the examination questions are © Engineers and Geoscientists BC. Open the official past paper (linked at the top of this page) to read the question, then follow the worked solution below.

[Figure not reproduced: Given front view and isometric of the stepped hub. See the official exam paper or the cited reference text.]

Fig. Q4 — given views: Front view showing four concentric circles, and an isometric pictorial showing a wide outer rim, a shallow recessed dish, and a raised central hub with a bore.

Given. A rotationally-symmetric part (a wheel/hub, e.g. a pulley or bearing retainer): a wide flat outer rim (largest diameter), a shallow recessed dish set below the rim's top surface, and a raised cylindrical hub at the centre standing ABOVE the rim, bored through with a central hole. This is a classic candidate for a full section, since every internal step is otherwise invisible or shown only as a thicket of hidden lines.

Approach

Cut a FULL SECTION on a plane through the central axis (line A-A on the Front view). Since the part is a solid of revolution, the cutting plane's trace is identical on every diametral cut, so the section profile is simply the part's radial cross-section, mirrored about the centreline; hatch every region the cutting plane actually passes through solid material, and leave the bore (and any open space) unhatched.

A A FRONT VIEW SECTION A-A (height x1.8 for clarity)
Fig. Q4 — Front view with cutting plane A-A, and the resulting full Section A-A: rim (outer step), recessed dish (mid step), raised hub with through-bore (centre). Hatched at 45°, section height exaggerated ×1.8 for sketch clarity.

Only the material actually cut by plane A-A is hatched (the solid annular profile from the bore wall out to the rim's outer diameter); the bore itself, being open space, is left white. No hidden lines are drawn on a sectioned view — every internal step that used to need a hidden line in the Front view is now a plain visible line in the section.