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MATSEC SEC Graphical Communication study materials
MATSEC SEC Graphical Communication study resources

MATSEC SEC Graphical Communication practice questions

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Question 1Orthographic projection and multi-view drawing

In first-angle orthographic projection, where is the plan placed relative to the front elevation?

  1. To the right of the front elevation
  2. To the left of the front elevation
  3. Above the front elevation
  4. Below the front elevation Correct answer.

Explanation

First-angle projection places the object between the observer and the projection plane, so the view seen from above is projected onto the horizontal plane underneath the object. The plan therefore sits directly below the front elevation in the standard layout.

Question 2Orthographic projection and multi-view drawing

Which line type is used to represent hidden edges in an orthographic drawing?

  1. Short dashed line Correct answer.
  2. Long chain line
  3. Continuous thin line
  4. Continuous thick line

Explanation

Hidden edges are shown with short, evenly spaced dashes so the reader knows the feature exists but is not visible from that direction. Continuous thick lines are reserved for visible outlines, while chain lines mark centres and axes.

Question 3Orthographic projection and multi-view drawing

What is the purpose of a centre line in an orthographic view of a symmetrical object?

  1. To indicate where a dimension starts
  2. To show the edge of the drawing sheet
  3. To outline a feature that is hidden from view
  4. To mark the axis of symmetry of a feature Correct answer.

Explanation

A centre line is a chain line drawn through the centre of circles, cylinders and symmetrical features. It defines the axis about which the geometry is symmetrical and provides a reference for dimensioning.

Question 4Orthographic projection and multi-view drawing

A cube with a vertical cylindrical hole through it is drawn in first-angle projection. How should the hole appear in the plan?

  1. As a dashed circle in the plan
  2. As a continuous thick circle in the plan Correct answer.
  3. As two parallel dashed lines in the plan
  4. As a chain line circle in the plan

Explanation

The plan is the view from above, so the top opening of a vertical hole is directly visible and is drawn with a continuous thick outline. Dashed lines would be used only for hidden edges, which do not occur here in the plan.

Question 5Orthographic projection and multi-view drawing

An object has an inclined face that appears as a line in the front elevation and foreshortened in the plan. Which view would show the true shape of that face?

  1. A second elevation from the opposite side
  2. A sectional view taken through the centre
  3. An auxiliary view normal to the face Correct answer.
  4. An enlarged detail view of the face

Explanation

A face inclined to the principal planes is foreshortened in every principal view, so its true shape cannot be read from them. An auxiliary view is set up on a plane parallel to the inclined face, giving the true shape and size.

Question 6Orthographic projection and multi-view drawing

In third-angle projection, a right side view is placed in which position relative to the front view?

  1. Above the top view
  2. Below the front view
  3. To the left of the front view
  4. To the right of the front view Correct answer.

Explanation

Third-angle projection places each view on the side of the front view from which it is seen, so the right side view goes to the right. This is the opposite of first-angle, where the right side view would be placed on the left.

Question 7Orthographic projection and multi-view drawing

When choosing the front elevation for an orthographic drawing, which view is normally selected?

  1. The view requiring the fewest projection lines
  2. The view showing the characteristic profile Correct answer.
  3. The view containing the most hidden detail
  4. The view with the largest overall dimension

Explanation

The front elevation should communicate the object's shape as clearly as possible, so the view that shows the characteristic profile and the least hidden detail is preferred. The other principal views are then projected from it.

Question 8Orthographic projection and multi-view drawing

In a standard orthographic layout, what is the purpose of the 45° mitre line drawn from the intersection of the plan and end view?

  1. To project heights from the elevation to the plan
  2. To locate the centre of a circular feature
  3. To transfer depths from the plan to the end view Correct answer.
  4. To divide the drawing sheet into quadrants

Explanation

The mitre line turns the depth direction through 90°, allowing depths measured in the plan to be carried across into the end view. Heights are already transferred vertically from the elevation, so the mitre line deals only with depth.

Question 9Orthographic projection and multi-view drawing

A flat face is inclined to both the horizontal and vertical planes. How does it appear in the three principal views?

  1. True shape in the plan only
  2. Foreshortened in all three principal views Correct answer.
  3. True shape in at least one principal view
  4. As a straight line in all three principal views

Explanation

A face inclined to both the horizontal and vertical planes is also inclined to the profile plane, so no principal view looks at it square-on. It is therefore foreshortened in the front, top and side views, and an auxiliary view is needed for its true shape.

Question 10Orthographic projection and multi-view drawing

A straight line is perpendicular to the vertical plane and parallel to the horizontal plane. How does it appear in the front elevation and the plan?

  1. A foreshortened line in both the elevation and the plan
  2. A true-length line in the front elevation and a point in the plan
  3. A point in the elevation and a true-length line in the plan Correct answer.
  4. A point in both the elevation and the plan

Explanation

The front elevation looks along the direction perpendicular to the vertical plane, so a line normal to that plane collapses to a point. The plan looks down on a line that is parallel to the horizontal plane, so its true length is seen there.

Question 11Orthographic projection and multi-view drawing

In third-angle orthographic projection, where is the plan placed in relation to the front elevation?

  1. To the left of the front elevation
  2. To the right of the front elevation
  3. Below the front elevation
  4. Above the front elevation Correct answer.

Explanation

In third-angle projection the object is imagined between the observer and the projection plane, so the view from above is projected onto a plane above the front view. The plan is therefore placed directly above the front elevation, not below it as in first-angle projection.

Question 12Orthographic projection and multi-view drawing

Which line type is used for the visible outlines of an object in an orthographic drawing?

  1. Continuous thick line Correct answer.
  2. Chain line
  3. Continuous thin line
  4. Dashed line

Explanation

Visible outlines are drawn with a continuous thick line so that the object's shape stands out clearly from construction, dimensioning and hatching. Thin continuous lines are used for dimension lines, extension lines and hatching, not for the main outline.

Question 13Orthographic projection and multi-view drawing

A flat face is parallel to the horizontal plane and perpendicular to the vertical plane. In which principal view does it appear as a true shape?

  1. Auxiliary view
  2. End elevation
  3. Plan Correct answer.
  4. Front elevation

Explanation

A face parallel to the horizontal plane is projected onto that plane without foreshortening, so its true shape appears in the plan. The front and end elevations look along the face and therefore show it as a horizontal line.

Question 14Orthographic projection and multi-view drawing

An object has a flat face inclined to the horizontal plane and to both vertical planes. Which view is required to show the true shape of that face?

  1. Front elevation
  2. End elevation
  3. Plan
  4. Auxiliary view Correct answer.

Explanation

A face inclined to all three principal planes is foreshortened in every principal view, so none of them can show its true shape. An auxiliary view is projected perpendicular to the inclined face to display it true size and shape.

Question 15Orthographic projection and multi-view drawing

A cylinder lies on the horizontal plane with its axis parallel to the vertical plane. What is the shape of its front elevation?

  1. Ellipse
  2. Rectangle Correct answer.
  3. Triangle
  4. Circle

Explanation

With the axis horizontal and parallel to the vertical plane, the front elevation shows the cylinder's length and diameter as a rectangle. The circular ends appear as circles only in the end view, where the axis is seen along its length.

Question 16Orthographic projection and multi-view drawing

In a sectional orthographic view, what do the thin parallel lines drawn at 45° indicate?

  1. Centre lines of holes and axes of symmetry
  2. Solid material cut by the cutting plane Correct answer.
  3. Hidden internal edges that are not visible
  4. Dimensions of the section including sizes

Explanation

The thin parallel lines at 45° are hatching, and they show the solid material cut by the cutting plane in a sectional view. Hatching is not used for hidden edges, centre lines or dimensions.

Question 17Orthographic projection and multi-view drawing

Which line type is used to indicate the position and direction of a cutting plane in a sectional view?

  1. A chain line with thick ends and arrows Correct answer.
  2. A dashed line showing hidden edges
  3. A continuous thin line used for dimensions
  4. A continuous thick line showing visible outlines

Explanation

A cutting plane is shown by a chain line with thick ends, and arrows at the ends indicate the direction in which the section is viewed. This convention distinguishes the cutting plane from ordinary centre lines and visible outlines.

Question 18Orthographic projection and multi-view drawing

What is the purpose of a ground line (XY line) in an orthographic drawing?

  1. To indicate a cutting plane
  2. To show the centre of symmetry
  3. To mark hidden edges
  4. To align and separate adjacent views Correct answer.

Explanation

The ground line represents the intersection between the horizontal and vertical projection planes. It is used to align and separate adjacent views, such as the front elevation and the plan, in the drawing layout.

Question 19Orthographic projection and multi-view drawing

A right circular cone stands on its base on the horizontal plane. It is cut by a plane that passes through the apex and is perpendicular to the vertical plane. What is the true shape of the section?

  1. A hyperbola
  2. A parabola
  3. A triangle Correct answer.
  4. An ellipse

Explanation

A cutting plane that passes through the apex of a cone contains two generators, so the section is bounded by two straight lines and the base line. The true shape is therefore a triangle, not one of the conic curves.

Question 20Orthographic projection and multi-view drawing

A straight line is parallel to the horizontal plane and inclined at 30° to the vertical plane. Which view shows its true length?

  1. Auxiliary view
  2. End elevation
  3. Front elevation
  4. Plan Correct answer.

Explanation

A line parallel to the horizontal plane is projected onto the plan without foreshortening, so the plan shows its true length. The front elevation shows the line parallel to XY and foreshortened because the line is inclined to the vertical plane.

Question 21Orthographic projection and multi-view drawing

Which principal orthographic view is obtained by projecting an object onto the horizontal plane?

  1. The front elevation
  2. The side elevation
  3. The plan Correct answer.
  4. The auxiliary view

Explanation

The horizontal plane is viewed from above, so the projection onto it is the plan or top view. The front and side elevations are projected onto vertical planes, while an auxiliary view uses an additional inclined plane.

Question 22Orthographic projection and multi-view drawing

A right circular cylinder stands on its base on the horizontal plane. What is the shape of its plan?

  1. A triangle
  2. A rectangle
  3. A circle Correct answer.
  4. An ellipse

Explanation

When a cylinder stands vertically on its base, the plan looks directly down the axis and shows the circular base in true shape. The front elevation would be a rectangle.

Question 23Orthographic projection and multi-view drawing

What does it mean when a line appears foreshortened in an orthographic view?

  1. It is shown at its true length.
  2. It is drawn with a hidden line style.
  3. It is omitted from that view.
  4. It appears shorter than its true length. Correct answer.

Explanation

Foreshortening occurs when a line or surface is inclined to the plane of projection, so its projected length is less than the true length. A line parallel to the plane is shown at true length.

Question 24Orthographic projection and multi-view drawing

A rectangular block has a horizontal hole drilled right through it from front to back. How is the hole shown in the plan?

  1. As a single centre line
  2. As two parallel hidden lines Correct answer.
  3. As a visible circle
  4. As a solid rectangle

Explanation

From above, the hole is inside the block and cannot be seen, so its sides are drawn as hidden lines. The hole would appear as a visible circle in the front elevation because the drill axis is perpendicular to that view.

Question 25Orthographic projection and multi-view drawing

In third-angle orthographic projection, where is the plane of projection located relative to the observer and the object?

  1. Between the observer and the object Correct answer.
  2. At the same position as the object
  3. Behind the object, away from the observer
  4. Above the object only

Explanation

In third-angle projection the projection plane is imagined between the observer and the object, so the view is placed on the same side as the observer. First-angle projection reverses this, placing the object between the observer and the plane.

Question 26Orthographic projection and multi-view drawing

A flat rectangular face is perpendicular to both the horizontal plane and the vertical plane. How does it appear in the plan and front elevation?

  1. As a true shape in the plan and a line in the front elevation
  2. As a true shape in both views
  3. As a line in both views Correct answer.
  4. As a line in the plan and a true shape in the front elevation

Explanation

A surface perpendicular to a plane is seen edge-on as a line in the view on that plane. Since the face is perpendicular to both principal planes, it appears as a line in both the plan and front elevation.

Question 27Orthographic projection and multi-view drawing

Why are the front elevation and the plan normally aligned vertically in an orthographic layout?

  1. To avoid drawing hidden lines
  2. To show the object in isometric projection
  3. So that widths and features correspond Correct answer.
  4. To make the drawing fit the paper size

Explanation

Vertical alignment transfers widths from the plan up to the front elevation, so corresponding features line up. This projection relationship is essential for accurate multi-view drawing.

Question 28Orthographic projection and multi-view drawing

In a sectional orthographic drawing, what do the arrows on the cutting plane line indicate?

  1. The direction of sight Correct answer.
  2. The scale of the section
  3. The direction of hatching
  4. The depth of the cut

Explanation

The arrows at the ends of a cutting plane line point in the direction of sight for the sectional view. The section is then projected as seen from that direction.

Question 29Orthographic projection and multi-view drawing

A straight line is inclined to both the horizontal and vertical planes. How is its true length determined in orthographic drawing?

  1. Directly from the front elevation
  2. By extending the ground line
  3. Directly from the plan
  4. By drawing an auxiliary view Correct answer.

Explanation

When a line is inclined to both principal planes, neither the front elevation nor the plan shows its true length. An auxiliary view is constructed on a plane parallel to the line to reveal the true length.

Question 30Orthographic projection and multi-view drawing

A cutting plane is stepped so that it passes through several features that do not lie in a straight line. What is this type of section called?

  1. A broken-out section
  2. A half section
  3. An offset section Correct answer.
  4. A revolved section

Explanation

An offset section uses a stepped cutting plane to pass through features that are not aligned, then the cut is projected as a single sectional view. A half section cuts away only a quarter of the object.

Question 31Orthographic projection and multi-view drawing

Which line type is used in an orthographic multi-view drawing to represent an edge that is hidden from the viewing direction?

  1. A continuous thin line
  2. A thin dashed line Correct answer.
  3. A continuous thick line
  4. A thin chain line

Explanation

Hidden edges are drawn with a thin dashed line so they can be distinguished from visible outlines, which are continuous thick lines. The dashes should be evenly spaced and of consistent length.

Question 32Orthographic projection and multi-view drawing

A square pyramid stands on its base on the horizontal plane with its axis perpendicular to the horizontal plane. What is the shape of its plan?

  1. A triangle with a vertical centre line
  2. A square with diagonals drawn from corner to corner Correct answer.
  3. A circle with a cross in the centre
  4. A rectangle divided into two equal squares

Explanation

With the square base flat on the horizontal plane, the plan shows the true square shape of the base. The apex projects to the centre of the square, so the four sloping edges appear as diagonals.

Question 33Orthographic projection and multi-view drawing

In an orthographic drawing, what is indicated by a thin chain line that passes through the centre of a circular hole?

  1. The outline of the hole seen in the view
  2. The hidden edge of the hole
  3. The centre line of the circular feature Correct answer.
  4. The cutting plane used for a section

Explanation

A thin chain line is the standard line type for centre lines, and it marks the axis or centre of a circular feature. It is not a visible or hidden edge, so it does not describe the hole's outline.

Question 34Orthographic projection and multi-view drawing

In third-angle orthographic projection, which two overall dimensions are shown in a right side elevation?

  1. Height and width
  2. Width and depth
  3. Depth and diagonal size
  4. Height and depth Correct answer.

Explanation

The front elevation shows height and width, the plan shows width and depth, and the side elevation shows height and depth. These pairings follow from the directions in which each view is projected.

Question 35Orthographic projection and multi-view drawing

A small irregular area of an orthographic view is broken away to reveal an internal feature, while the rest of that view still shows the outside of the object. What is this drawing called?

  1. A half section
  2. A full section
  3. A revolved section
  4. A broken-out section Correct answer.

Explanation

A broken-out section exposes only the part of the object where internal detail is needed, using an irregular break line to separate it from the outside view. It avoids sectioning the whole object when only a local feature must be shown.

Question 36Orthographic projection and multi-view drawing

In a multi-view orthographic layout, what is the purpose of a 45° miter line drawn between the plan and an end elevation?

  1. To show the position of a cutting plane
  2. To indicate hidden edges in the end elevation
  3. To transfer depths from the plan to the end elevation Correct answer.
  4. To transfer heights from the front elevation to the plan

Explanation

A 45° miter line provides a geometric link between the plan and the end elevation, allowing depth dimensions to be carried across accurately. Heights are already aligned horizontally between the front elevation and the end elevation.

Question 37Orthographic projection and multi-view drawing

What does a half section show in an orthographic drawing?

  1. Only the hidden internal features, drawn with dashed lines
  2. A quarter of the object removed, so half the view is in section and half is an outside view Correct answer.
  3. Half of the object removed, with the remaining half shown in section
  4. The whole object cut and hatched, with no outside view

Explanation

A half section removes one quarter of the object, which makes half of the resulting view show the section and the other half show the outside. It is useful for symmetrical objects because it reveals internal detail while preserving external shape.

Question 38Orthographic projection and multi-view drawing

Why are hidden lines usually omitted from a sectional orthographic view?

  1. Because hidden lines are always drawn too thick for section views
  2. Because the section already shows the internal features that hidden lines would describe Correct answer.
  3. Because hatching replaces every internal edge in the object
  4. Because hidden lines are only permitted in first-angle projection

Explanation

The purpose of a section is to make internal features visible, so drawing hidden lines as well would add clutter without adding information. Omitting them keeps the section clear and easier to read.

Question 39Orthographic projection and multi-view drawing

A rib or web is cut lengthwise by a cutting plane that passes along its flat side. How is it conventionally shown in the sectional view?

  1. It is drawn with hidden lines instead of hatching
  2. It is removed completely from the sectional view
  3. It is hatched more heavily than the main body
  4. It is left unhatched to avoid giving a false impression of thickness Correct answer.

Explanation

When a thin rib or web is cut longitudinally, hatching it would make the section look like a thick solid part. The standard convention is therefore to leave it unhatched, even though the cutting plane passes through it.

Question 40Orthographic projection and multi-view drawing

A right circular cylinder stands on its base on the horizontal plane. It is cut by a plane that is inclined to the horizontal plane, perpendicular to the vertical plane, and passes through the curved surface without touching either base. What is the true shape of the section?

  1. A circle
  2. A rectangle
  3. A parabola
  4. An ellipse Correct answer.

Explanation

An oblique plane cutting all the generators of a cylinder produces an ellipse; the section is bounded by the curved surface on all sides. A plane parallel to the base would give a circle, and a plane parallel to the axis would give a rectangle.

Question 41Pictorial drawing (isometric and oblique projection)

In an isometric drawing, the two receding axes are set out at which angle to the horizontal?

  1. 90°
  2. 60°
  3. 45°
  4. 30° Correct answer.

Explanation

Isometric axes are spaced 120° apart on the drawing, which places the two receding axes at 30° above and below the horizontal while the third axis remains vertical. This 30° setting is the standard construction for isometric work.

Question 42Pictorial drawing (isometric and oblique projection)

Which face of an object is drawn true shape and size in an oblique projection?

  1. The side face nearest the receding axis
  2. The front face parallel to the picture plane Correct answer.
  3. Every visible face, because no foreshortening occurs
  4. The top face only

Explanation

In oblique projection the front face is placed parallel to the picture plane, so its edges are projected without foreshortening and can be measured directly. The receding axis carries the depth, and that direction is the one that becomes distorted.

Question 43Pictorial drawing (isometric and oblique projection)

In cabinet oblique projection, the receding dimensions are drawn at what proportion of their true length?

  1. Full true length
  2. Half true length Correct answer.
  3. Two-thirds true length
  4. One-quarter true length

Explanation

Cabinet oblique halves the measurements taken along the receding axis to reduce the exaggerated depth that appears when full lengths are used. Cavalier oblique, by contrast, sets out the receding axis at full true length.

Question 44Pictorial drawing (isometric and oblique projection)

What distinguishes an isometric drawing from an isometric projection?

  1. The drawing omits all hidden detail, while the projection includes it.
  2. The drawing uses 45° axes, while the projection uses 30° axes.
  3. The drawing uses true axis lengths; the projection uses lengths reduced by about 0.816. Correct answer.
  4. The drawing shows only the front face true shape, while the projection shows all faces true shape.

Explanation

An isometric drawing is set out with the full true lengths along the three isometric axes for convenience. An isometric projection is the true orthographic view onto the isometric plane, so every axis length is foreshortened by the factor 0.816.

Question 45Pictorial drawing (isometric and oblique projection)

A circle lies on the top face of a cube in an isometric drawing. How is that circle represented?

  1. As an ellipse Correct answer.
  2. As a parabola
  3. As a straight line
  4. As a true circle

Explanation

A circle on any isometric face is seen obliquely, so it projects as an ellipse rather than a true circle. The ellipse's major and minor axes depend on the face and are set out with the isometric construction.

Question 46Pictorial drawing (isometric and oblique projection)

How is a non-isometric line, such as a sloping roof edge, set out in an isometric drawing?

  1. By projecting it at 45° from the nearest front corner
  2. By drawing it at 30° to the horizontal and scaling it by half
  3. By locating both endpoints on the isometric grid and joining them Correct answer.
  4. By drawing it true length at whatever angle it appears in the elevation

Explanation

A non-isometric line is not parallel to any of the three isometric axes, so its length cannot be measured directly along an axis. The reliable method is to locate each endpoint using isometric coordinates and then join the two points.

Question 47Pictorial drawing (isometric and oblique projection)

Which statement about cavalier oblique projection is correct?

  1. The receding axis is drawn at full true length. Correct answer.
  2. The receding axis is drawn at half true length.
  3. All three axes are set out at 30° to the horizontal in this projection.
  4. The front face is foreshortened by 0.816.

Explanation

Cavalier oblique keeps the receding axis at full true length, so depth measurements are transferred directly. Cabinet oblique is the variant that halves the receding dimensions.

Question 48Pictorial drawing (isometric and oblique projection)

Oblique projection is most suitable for an object that has...

  1. Only curved surfaces with no flat front face
  2. A complex front face and relatively simple depth Correct answer.
  3. Three equally complex faces that meet at a single corner
  4. No edges parallel to the picture plane

Explanation

Oblique projection shows the front face true shape, so it is ideal when most detail lies on that face. A simple depth is an advantage because the receding axis is the direction that becomes distorted.

Question 49Pictorial drawing (isometric and oblique projection)

A 60 mm true edge is drawn along an isometric axis in an isometric projection. What length should be set out, to the nearest millimetre?

  1. 74 mm
  2. 60 mm
  3. 42 mm
  4. 49 mm Correct answer.

Explanation

Isometric projection foreshortens every axis length by the factor 0.816, so 60 mm becomes 60 × 0.816 ≈ 49 mm. An isometric drawing would use the full 60 mm instead.

Question 50Pictorial drawing (isometric and oblique projection)

In an isometric drawing, a 50 mm diameter circle is drawn on the top face of a block. What is the approximate length of the major axis of the resulting ellipse?

  1. 71 mm
  2. 61 mm Correct answer.
  3. 50 mm
  4. 35 mm

Explanation

For an isometric drawing, the ellipse that represents a circle has a major axis of about 1.22 times the circle diameter and a minor axis of about 0.71 times the diameter. Here 1.22 × 50 mm ≈ 61 mm, and the major axis is set perpendicular to the vertical isometric axis for a top-face circle.