I85PREP
⌘ K
MATSEC AM Graphical Communication study materials
MATSEC AM Graphical Communication study resources

MATSEC AM Graphical Communication practice questions

One question at a time. Build your MATSEC AM Graphical Communication understanding.

First 50 of 200 questions. Each one lists the choices, the correct answer, and an explanation. The checker at the top of this page saves progress in this browser when it is available.

Continue in the practice tool above to load more questions, 50 at a time.

Question 1Graphical Communication

In a graphical communication drawing, which line type is used to show hidden edges and surfaces that are not visible in the current view?

  1. Chain line
  2. Continuous thick line
  3. Continuous thin line
  4. Short-dashed line Correct answer.

Explanation

Hidden detail is represented by a short-dashed line, drawn with evenly spaced dashes that are noticeably shorter than those of a centre line. This convention lets a reader understand internal features without a section view.

Question 2Graphical Communication

A drawing is plotted at a scale of 1:50. A wall measures 84 mm on the drawing. What is its real length?

  1. 4.20 m Correct answer.
  2. 1.68 m
  3. 8.40 m
  4. 0.84 m

Explanation

At 1:50 each drawing millimetre represents 50 real millimetres, so 84 mm × 50 = 4200 mm, which equals 4.20 m. Always convert the drawing measurement to real units by multiplying by the scale denominator.

Question 3Graphical Communication

Which instrument is most appropriate for drawing a smooth curve through a series of plotted points that do not lie on a circular arc?

  1. Protractor
  2. Set square
  3. French curve Correct answer.
  4. Pair of compasses

Explanation

A French curve is a template with varying curvature that allows a smooth freehand-guided curve to be drawn through non-circular points. Compasses are limited to true circular arcs of fixed radius.

Question 4Graphical Communication

On an engineering drawing, what does the abbreviation 'R' preceding a dimension value represent?

  1. The reference dimension from a datum
  2. The roughness of a machined surface
  3. The revolution speed of a part
  4. The radius of an arc or circle Correct answer.

Explanation

The prefix R before a numerical value denotes a radius, for example R25 means an arc of 25 mm radius. Diameters are marked with the diameter symbol instead.

Question 5Graphical Communication

Which projection method places the object between the observer and the plane of projection, so that each view is projected onto the far side of the object?

  1. Perspective projection
  2. First-angle projection Correct answer.
  3. Third-angle projection
  4. Isometric projection

Explanation

In first-angle projection the object sits between the eye and the projection plane, so the view appears on the far side. This is why the plan is placed below the elevation in first-angle layouts.

Question 6Graphical Communication

What is the standard purpose of a title block on a technical drawing sheet?

  1. To record the drawing number, scale, date and author Correct answer.
  2. To list every dimension used in the drawing
  3. To show the section hatching conventions
  4. To provide the bill of materials for assembly

Explanation

The title block is a reserved area, usually bottom right, that identifies the drawing through its number, title, scale, date, revisions and the names of those who drew and checked it. It is an administrative record rather than a technical description of the part.

Question 7Graphical Communication

Which type of pictorial drawing keeps all three axes equally foreshortened at 120° to one another, giving equal scale along each axis?

  1. Oblique cavalier projection
  2. Dimetric projection
  3. Isometric projection Correct answer.
  4. One-point perspective

Explanation

Isometric projection has three axes separated by 120°, with equal foreshortening along each, so equal lengths are scaled identically. This equal scaling is what distinguishes it from dimetric and trimetric axonometric drawings.

Question 8Graphical Communication

A drawing shows a component at a scale of 2:1. Which statement correctly describes the resulting drawing?

  1. The drawing is the same size as the component
  2. The drawing is twice the real size of the component Correct answer.
  3. The drawing is four times the real size of the component
  4. The drawing is half the real size of the component

Explanation

A scale of 2:1 means two drawing units represent one real unit, so the drawing is an enlargement, twice full size. This is common for small precision parts that need to be shown larger than life.

Question 9Graphical Communication

A horizontal line 120 mm long is to be divided into five equal parts using the geometric construction method. What is the length of each resulting division?

  1. 30 mm
  2. 20 mm
  3. 24 mm Correct answer.
  4. 25 mm

Explanation

Dividing the total length by the number of parts gives 120 ÷ 5 = 24 mm. The construction using an inclined auxiliary line and parallel projectors guarantees exact equal division without measuring each segment.

Question 10Graphical Communication

When constructing a regular hexagon inside a circle of given diameter using the compass method, what is the length of each side of the hexagon?

  1. Equal to the radius multiplied by 1.414
  2. Equal to the diameter of the circle
  3. Equal to the diameter divided by three
  4. Equal to the radius of the circle Correct answer.

Explanation

A regular hexagon inscribed in a circle has side length equal to the radius, because stepping the radius around the circumference divides it exactly six times. This property allows the hexagon to be set out with compasses alone.

Question 11Graphical Communication

An orthographic layout shows a front elevation and a plan. In third-angle projection, where is the plan placed relative to the front elevation?

  1. To the right of the front elevation
  2. Directly below the front elevation
  3. To the left of the front elevation
  4. Directly above the front elevation Correct answer.

Explanation

In third-angle projection the plan is placed above the front elevation, because the horizontal plane is imagined between the observer and the object and unfolds upwards. First-angle projection places the plan below instead.

Question 12Graphical Communication

What is the principal purpose of a section view in a technical drawing?

  1. To show the internal features of a component clearly Correct answer.
  2. To reduce the number of dimensions required
  3. To indicate the manufacturing tolerances
  4. To display the component in three dimensions

Explanation

A section view imagines the component cut by a cutting plane and removes the material in front, exposing internal bores, cavities and wall thicknesses as solid outlines. This replaces many hidden lines with clear visible edges.

Question 13Graphical Communication

In a section view, adjacent parts of an assembly are hatched differently. What is the main reason for this convention?

  1. To identify the material specification
  2. To indicate the direction of machining
  3. To distinguish separate components from one another Correct answer.
  4. To show which part is the largest

Explanation

Hatching lines are drawn at different angles or spacings on adjacent parts so that each component remains visually distinct where they touch. Without this change of direction the boundary between parts would be ambiguous.

Question 14Graphical Communication

A drawing carries the dimension 45 ±0.2. What does this indicate?

  1. The dimension must be exactly 45.0
  2. The dimension may range from 44.8 to 45.2 Correct answer.
  3. The dimension is 45.2 with a tolerance of 0.2
  4. The dimension may range from 44.8 to 45.0

Explanation

The ± symbol gives a bilateral tolerance, so the acceptable limits are 45 − 0.2 = 44.8 and 45 + 0.2 = 45.2. Any size within this range is acceptable.

Question 15Graphical Communication

Which line is conventionally used to indicate the cutting plane of a section view?

  1. A continuous thin line with dots
  2. A short-dashed line
  3. A continuous thick line with arrowheads at the ends
  4. A chain line with thick ends and arrows showing viewing direction Correct answer.

Explanation

A cutting plane line is a chain line thickened at its ends, with arrows at the ends indicating the direction in which the section is viewed. Letters may be added to link the cutting plane to the labelled section view.

Question 16Graphical Communication

On a drawing, a dimension is placed with a leader pointing to a small circular hole and preceded by the diameter symbol. Why is the leader used rather than dimension lines between extension lines?

  1. Because circular features must always be dimensioned from a datum
  2. Because the diameter symbol is only valid on leaders
  3. Because leaders show manufacturing sequence
  4. Because the space inside the small circle is too limited for arrows and figures Correct answer.

Explanation

Small features such as holes often cannot accommodate dimension lines, arrowheads and figures inside the view, so a leader with the diameter symbol is used to point to the feature. This keeps the drawing legible while preserving the correct dimension value.

Question 17Graphical Communication

A point is plotted in isometric projection with its three axes drawn at 120°. What angle does each isometric axis make with the horizontal when the vertical axis is upright?

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

Explanation

With the vertical axis upright, the two receding isometric axes each make 30° with the horizontal, giving 120° between any pair of axes. This 30° setting-out angle is the basis of isometric grid work.

Question 18Graphical Communication

Which statement correctly describes the difference between a centre line and a chain line with a thick end?

  1. A centre line marks axes of symmetry; a chain line with a thick end marks a cutting plane Correct answer.
  2. A centre line marks hidden edges; a chain line marks visible edges
  3. A centre line marks dimensions; a chain line marks projections
  4. A centre line marks hatching; a chain line marks tolerances

Explanation

A chain line consisting of long dashes and dots is used for centre lines through circles and axes of symmetry. When its ends are thickened and fitted with arrows it becomes a cutting plane line indicating where a section is taken.

Question 19Graphical Communication

A drawing is to be produced at a scale that allows a 3.6 m long wall to be represented by 72 mm on the sheet. Which scale should be stated in the title block?

  1. 1:200
  2. 1:25
  3. 1:20
  4. 1:50 Correct answer.

Explanation

The ratio is 72 mm to 3600 mm, which simplifies to 1:50 after dividing both values by 72. The stated scale must always be the simplified ratio of drawing length to real length.

Question 20Graphical Communication

Why is it preferable to place dimensions outside the outline of a view rather than inside the hatched area of a section?

  1. Because dimensions are never permitted on section views
  2. Because dimensions inside a view alter the scale
  3. Because dimensions inside hatching are difficult to read and may be confused with hatch lines Correct answer.
  4. Because hatching must remain continuous for clarity

Explanation

Hatch lines cross the interior of a section, so figures and arrowheads placed there become hard to distinguish and reduce legibility. Dimensions are therefore kept outside the outline wherever practical, with leaders used where necessary.

Question 21Graphical Communication

A truncated cone is drawn in orthographic projection with a base diameter of 60 mm, a top diameter of 30 mm and a vertical height of 40 mm. What is the true length of the slant edge?

  1. 56.6 mm
  2. 40.0 mm
  3. 50.0 mm
  4. 42.7 mm Correct answer.

Explanation

The slant edge forms the hypotenuse of a right triangle with vertical height 40 mm and radial difference (60 − 30)/2 = 15 mm. The length is √(40² + 15²) = √1825 ≈ 42.7 mm.

Question 22Graphical Communication

A component is shown in first-angle projection with a front elevation and an end elevation placed to its left. From which side of the object is that end elevation viewed?

  1. From above
  2. From the right-hand side Correct answer.
  3. From below
  4. From the left-hand side

Explanation

In first-angle projection the view placed on the left of the elevation is the one seen from the right, because the object lies between the observer and the plane. This reversal is the key trap when reading first-angle layouts.

Question 23Graphical Communication

A drawing uses a scale of 1:25. A rectangular room measures 96 mm by 64 mm on the drawing. What is the real floor area of the room?

  1. 6.14 m² Correct answer.
  2. 3.84 m²
  3. 15.36 m²
  4. 24.58 m²

Explanation

Real dimensions are 96 × 25 = 2400 mm and 64 × 25 = 1600 mm, giving 2.4 m × 1.6 m = 3.84 m². Note that area scales by the square of the linear factor, so this check confirms the linear conversion was applied correctly.

Question 24Graphical Communication

In an isometric drawing, a circular hole on the top face of a block appears as an ellipse. What is the ratio of the major axis to the minor axis of this isometric ellipse?

  1. 1:1
  2. 1.22:1
  3. 2:1
  4. 1.73:1 Correct answer.

Explanation

A circle in an isometric plane is foreshortened into an ellipse whose major axis is about 1.22 times the true diameter and whose minor axis is about 0.71 times it, giving a major-to-minor ratio of roughly 1.73:1. This ratio follows from the 35°16′ foreshortening of the isometric axes.

Question 25Graphical Communication

A drawing specifies a shaft of nominal diameter 30 mm with limits of 30.000 mm and 29.979 mm. Which description correctly classifies this tolerance?

  1. A unilateral tolerance of 0.021 mm below nominal Correct answer.
  2. A geometric tolerance for concentricity
  3. An interference fit with zero clearance
  4. A bilateral tolerance of ±0.021 mm

Explanation

Both limits lie at or below the nominal size, so the tolerance is applied in one direction only and is therefore unilateral. The total tolerance band is 30.000 − 29.979 = 0.021 mm.

Question 26Graphical Communication

In a graphical communication drawing, which line type is conventionally used to represent a hidden edge or concealed feature?

  1. A chain line of short dashes
  2. A continuous thick line
  3. A continuous thin line
  4. A short-dashed line of evenly spaced dashes Correct answer.

Explanation

Concealed or hidden edges are shown by short dashes of even length and spacing, drawn thinner than visible outlines. This convention lets the reader identify internal features that cannot be seen from the viewing direction without confusing them with visible edges.

Question 27Graphical Communication

A drawing is prepared at a scale of 1:5. On the sheet a rectangular component measures 40 mm by 25 mm. What is the actual area of the component?

  1. 0.05 m²
  2. 0.025 m² Correct answer.
  3. 0.0025 m²
  4. 0.005 m²

Explanation

At 1:5 each drawn millimetre represents 5 mm in reality, so the real dimensions are 200 mm by 125 mm. Multiplying gives 25 000 mm², which equals 0.025 m². The area therefore scales by the square of the scale factor, not by the factor itself.

Question 28Graphical Communication

In third-angle orthographic projection, a view taken from the left-hand side of the object is placed in which position relative to the front elevation?

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

Explanation

In third-angle projection the view is placed on the same side as the direction from which it is taken, so a left-hand view sits to the left of the front elevation. This is the opposite arrangement to first-angle projection, where the left view would be placed on the right.

Question 29Graphical Communication

A hexagonal nut is to be drawn in isometric projection. Which statement correctly describes how the hexagon on the top face is constructed?

  1. It is drawn as an ellipse enclosing the hexagon's corners
  2. It is drawn as a true regular hexagon with all sides equal to the diameter
  3. It is drawn as a true regular hexagon using 60° set squares Correct answer.
  4. It is drawn as a circle of the true diameter

Explanation

In isometric projection the top face is foreshortened, so a true hexagon cannot be drawn directly. The isometric hexagon is constructed by setting out the corners along the 30° isometric axes and joining them with lines parallel to those axes, producing a distorted but recognisable hexagon.

Question 30Graphical Communication

A drawing shows a part in half-section. What does a half-section view conventionally display?

  1. The object sectioned along its full length only
  2. The object cut by two parallel cutting planes
  3. One quarter of the object removed to reveal internal detail
  4. Half of the object shown in section and half in outside view Correct answer.

Explanation

A half-section removes one quarter of the object so that one half of the view shows the internal features in section while the other half shows the external outline. This allows both internal and external detail to be communicated in a single view.

Question 31Graphical Communication

A dimension of 60 mm is to be placed on an inclined line in a technical drawing. According to good drafting practice, how should the dimension text be oriented?

  1. Rotated to read from the bottom of the sheet
  2. Aligned with the dimension line so it reads from the bottom or right Correct answer.
  3. Written vertically along the extension line
  4. Always horizontal regardless of the line's angle

Explanation

Dimension text on inclined lines is aligned with the dimension line so that it can be read from the bottom or the right-hand edge of the sheet. This keeps the drawing legible without the reader having to rotate the sheet.

Question 32Graphical Communication

A circle of 50 mm diameter is to be divided into twelve equal parts using compass construction. What is the angle subtended at the centre by each part?

  1. 45°
  2. 60°
  3. 30° Correct answer.
  4. 15°

Explanation

Dividing a full circle of 360° into twelve equal parts gives 30° per part. This is achieved by stepping the radius around the circumference six times to give six parts, then bisecting each arc to obtain twelve.

Question 33Graphical Communication

An engineer's scale is marked 1:50 on one edge. A line on a drawing measures 84 mm. What real length does this represent?

  1. 4.2 m Correct answer.
  2. 42 m
  3. 0.84 m
  4. 0.42 m

Explanation

At 1:50 each drawn millimetre represents 50 mm, so 84 mm on the drawing represents 4200 mm in reality. Converting to metres gives 4.2 m.

Question 34Graphical Communication

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

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

Explanation

In first-angle projection the plan is placed below the front elevation, because the object is imagined between the observer and the plane of projection. This is the reverse of third-angle projection, where the plan appears above.

Question 35Graphical Communication

A pictorial drawing shows a cube with its front face drawn as a true square and receding edges drawn at 45° to the horizontal. Which type of projection is this?

  1. Trimetric projection
  2. Perspective projection
  3. Isometric projection
  4. Oblique projection Correct answer.

Explanation

In oblique projection the front face is drawn true shape and size, with receding edges drawn at an angle (commonly 45°) to represent depth. This differs from isometric, where all three axes are inclined and all faces are foreshortened.

Question 36Graphical Communication

A circle of 40 mm diameter is drawn on the top face of a block in isometric projection. What is the approximate length of the major axis of the resulting ellipse?

  1. 48 mm Correct answer.
  2. 69 mm
  3. 40 mm
  4. 56 mm

Explanation

In isometric projection a circle appears as an ellipse with a major axis of about 1.22 times the true diameter. For a 40 mm circle this gives approximately 48 mm. The minor axis is about 0.71 times the diameter.

Question 37Graphical Communication

A drawing is to be produced at a scale that allows a 4.5 m wall to be represented by 90 mm on the sheet. Which scale should be used?

  1. 1:25
  2. 1:20
  3. 1:50 Correct answer.
  4. 1:5

Explanation

The ratio of drawn length to real length is 90 mm to 4500 mm, which simplifies to 1:50. Dividing both sides by 90 gives the unit ratio.

Question 38Graphical Communication

Which statement correctly describes the purpose of a centre line in a technical drawing?

  1. To show the axis of symmetry or the centre of a circular feature Correct answer.
  2. To indicate a change of surface finish
  3. To indicate the boundary of a sectioned area
  4. To mark the outline of a visible edge

Explanation

A centre line is a chain line of long and short dashes used to show the axis of symmetry of a feature or the centre of a circle. It helps the reader locate circular features and check symmetry.

Question 39Graphical Communication

A conical taper is to be drawn between two circles of diameters 50 mm and 30 mm whose centres are 80 mm apart. What is the taper ratio expressed as a ratio of diameter change to length?

  1. 1:8
  2. 1:16
  3. 1:2
  4. 1:4 Correct answer.

Explanation

The change in diameter is 50 − 30 = 20 mm over a length of 80 mm, giving a ratio of 20:80, which simplifies to 1:4. Taper is conventionally expressed as the change in diameter per unit length.

Question 40Graphical Communication

A drawing uses a chain line with a thick long dash at each end. What feature does this line represent?

  1. A cutting plane or section line Correct answer.
  2. A centre line of a symmetrical feature
  3. A hidden internal edge
  4. A movable or alternative position of a part

Explanation

A chain line thickened at the ends and at changes of direction is the convention for a cutting plane line indicating where a section is taken. The thick ends mark the extremities of the cutting plane and the direction of viewing is shown by arrows.

Question 41Graphical Communication

A hole of 20 mm diameter is shown in a section view and the dimension is given as 'Ø20'. Why is the diameter symbol used rather than the letter 'D'?

  1. It is the standard symbol that precedes a diameter dimension Correct answer.
  2. It indicates the tolerance class of the hole
  3. It indicates that the feature is a full circle in the view
  4. It shows that the hole is drilled rather than cast

Explanation

The diameter symbol (a circle with a stroke through it) is the standard prefix for any dimension that specifies a diameter. It removes ambiguity about whether the value refers to a radius or a diameter.

Question 42Graphical Communication

An isometric drawing is to be produced of a rectangular block 60 mm × 40 mm × 30 mm. Along which axes are the three dimensions set out?

  1. All three along 45° axes
  2. All three along the vertical axis
  3. One along the horizontal axis and two at 45°
  4. Two along the 30° axes and one along the vertical axis Correct answer.

Explanation

In isometric drawing the three axes are inclined at 120° to one another, with one vertical and the other two at 30° to the horizontal. The length, width and height are therefore set out along these three axes.

Question 43Graphical Communication

A drawing is produced at a scale of 1:2.5. A feature measures 36 mm on the drawing. What is its real length?

  1. 9 mm
  2. 90 mm Correct answer.
  3. 14.4 mm
  4. 360 mm

Explanation

At 1:2.5 each drawn millimetre represents 2.5 mm in reality, so 36 mm on the drawing represents 90 mm. The calculation multiplies the drawn length by the scale denominator.

Question 44Graphical Communication

Which statement correctly describes the purpose of an auxiliary view in orthographic projection?

  1. To display the object in section only
  2. To show the object in three dimensions
  3. To show an inclined face in its true shape and size Correct answer.
  4. To replace the front elevation in a first-angle layout

Explanation

An auxiliary view is projected onto a plane parallel to an inclined face so that the face appears in true shape and size. This avoids the distortion that would occur if the face were projected onto the standard principal planes.

Question 45Graphical Communication

A section view of a cast-iron bracket is required. Which hatching convention is appropriate for the cut surface?

  1. No hatching, since the part is a single component
  2. Dashed lines at 45°
  3. Thick continuous lines at 90°
  4. Thin continuous lines at 45° spaced evenly Correct answer.

Explanation

Cut surfaces are hatched with thin continuous lines, usually at 45° to the principal outlines, spaced evenly. The hatching identifies the solid material that has been cut by the section plane.

Question 46Graphical Communication

A drawing shows a dimension of 50 mm with a tolerance of ±0.1 mm. A manufactured part measures 50.15 mm. Which statement is correct?

  1. The part is within tolerance because it is close to the nominal size
  2. The part is outside tolerance because it exceeds the upper limit Correct answer.
  3. The part is outside tolerance because it is below the lower limit
  4. The part is within tolerance because the tolerance is bilateral

Explanation

The limits are 49.9 mm and 50.1 mm. A measurement of 50.15 mm exceeds the upper limit of 50.1 mm, so the part is outside tolerance and would be rejected.

Question 47Graphical Communication

A line 100 mm long is to be divided into seven equal parts using the geometric construction method. Which step is essential to the construction?

  1. Drawing a circle of radius 100 mm and stepping the radius around it
  2. Drawing a line at any convenient angle from one end and stepping seven equal divisions along it Correct answer.
  3. Bisecting the line repeatedly
  4. Constructing a perpendicular bisector at the midpoint

Explanation

The standard construction draws an inclined line from one end of the given line, steps off seven equal divisions along it, then joins the last division to the far end of the given line and draws parallels through the remaining divisions. This divides the line into seven equal parts without calculation.

Question 48Graphical Communication

A developer's plan shows a room measuring 80 mm by 50 mm at a scale of 1:100. What is the real floor area of the room?

  1. 0.4 m²
  2. 4 m²
  3. 400 m²
  4. 40 m² Correct answer.

Explanation

At 1:100 the real dimensions are 8000 mm by 5000 mm, that is 8 m by 5 m. Multiplying gives a real floor area of 40 m². The area scales by the square of the linear factor.

Question 49Graphical Communication

In an orthographic drawing of a cylinder, which view shows the cylinder as a rectangle?

  1. Neither the front elevation nor the end elevation
  2. The front elevation only
  3. The plan view only
  4. Both the front elevation and the end elevation Correct answer.

Explanation

A cylinder viewed from the side appears as a rectangle whose width equals the diameter and whose height equals the length. Both the front elevation and the end elevation therefore show rectangles, while the plan shows a circle.

Question 50Graphical Communication

A drawing is to be produced at a scale that allows a 2.4 m beam to be represented by 120 mm on the sheet. Which scale should be used?

  1. 1:10
  2. 1:12
  3. 1:24
  4. 1:20 Correct answer.

Explanation

The ratio of drawn length to real length is 120 mm to 2400 mm, which simplifies to 1:20. Dividing both sides by 120 gives the unit ratio.