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Subjects · Leaving Cert Design & Communication Graphics (DCG)

Leaving Cert Design & Communication Graphics (DCG): Orthographic & auxiliary views

How often Orthographic & auxiliary views comes up on the Design & Communication Graphics papers, every year it was asked, and questions to try.

HL Asked on 6 of the last 9 Higher Level papers, most recently in 2025. most years

OL Asked on 9 of the last 9 Ordinary Level papers, most recently in 2025. banker

Orthographic & auxiliary views, Higher Level(7 marks)

Quick ones on Orthographic & auxiliary views.

(a)In first-angle projection, where is the plan placed relative to the elevation?
  1. Directly above it
  2. Directly below it
  3. To the right of it
(b)A plane appears as an edge (a straight line) in a view that looks along which line?
  1. A line that pierces the plane
  2. A line perpendicular to the plane
  3. A true-length line lying in the plane
(c)In third-angle projection, where is a view taken from the left of the object drawn?
  1. On the left of the elevation
  2. Below the plan
  3. On the right of the elevation
Show the answers

(a) Directly below it

(b) A true-length line lying in the plane

(c) On the left of the elevation

Your turn: Higher Level questions on Orthographic & auxiliary views.

Higher Level

Asked on 6 of the last 9 Higher Level papers, most recently in 2025. most years

Every paper, year by year

YearWhere it came up
2025B1
2024B2
2023Not asked
2022A3
2021B1
2019Not asked
2018B2
2017Not asked
2016A2

Links open the State Examinations Commission’s paper for that year.

More Orthographic & auxiliary views questions

Orthographic & auxiliary views, 2 marks

A face appears as a sloping line in the elevation. Is its plan its true shape?

  1. Yes, always
  2. Only in third-angle projection
  3. No, it is foreshortened
Show the answer

No, it is foreshortened

The face is inclined to the HP, so its plan is shortened in the direction of slope. An auxiliary view with X1Y1 parallel to the sloping line shows its true shape.

Orthographic & auxiliary views, 3 marks

A circular hole is cut in a face that is inclined to the HP (not vertical). How does the hole appear in plan?

  1. As a straight line
  2. As an ellipse
  3. As a circle
Show the answer

As an ellipse

The hole's diameter along the slope is shortened in plan, while the diameter along the level direction stays true, so the circle projects as an ellipse.

Orthographic & auxiliary views, 3 marks

A face is inclined to both the HP and the VP. How many auxiliary views are needed to show its true shape?

  1. Two
  2. One
  3. None
Show the answer

Two

The first auxiliary looks along a true-length line in the face so that it shows as an edge. The second, with X2Y2 parallel to that edge, shows the true shape.

Ordinary Level

Asked on 9 of the last 9 Ordinary Level papers, most recently in 2025. banker

Every paper, year by year

YearWhere it came up
2025B3
2024B1
2023A4, B1
2022A4, B3
2021B1
2019B3
2018A4, B1
2017B3
2016A4, B2

Links open the State Examinations Commission’s paper for that year.

More Orthographic & auxiliary views questions

Orthographic & auxiliary views, 2 marks

In first-angle projection, where is the plan drawn?

  1. Directly above the elevation
  2. To the right of the elevation
  3. Directly below the elevation
Show the answer

Directly below the elevation

In first angle the object sits above the HP and in front of the VP. When the planes unfold about XY, the plan lands below the elevation.

Orthographic & auxiliary views, 2 marks

Projectors between the elevation and the plan cross the XY line at what angle?

  1. 30 degrees
  2. 90 degrees
  3. 45 degrees
Show the answer

90 degrees

Projectors always run at right angles to the fold line, so a point in the elevation and its plan sit on the same vertical line.

Orthographic & auxiliary views, 3 marks

An auxiliary view is projected from the plan. Where do you take its heights from?

  1. The elevation, measured from XY
  2. The plan, measured from XY
  3. The end view, measured from its centre line
Show the answer

The elevation, measured from XY

A view projected from the plan is an auxiliary elevation. Every point sits the same height above X1Y1 as it does above XY in the elevation.

Other Design & Communication Graphics (DCG) topics

All of Leaving Cert Design & Communication Graphics (DCG)