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NSSCO Design and Technology (6187) study materials
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NSSCO Design and Technology (6187) practice questions

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Question 1Design process and problem solving

A designer is preparing a design brief for a new school bag. Which statement belongs in the brief rather than in the specification?

  1. The bag must use recycled polyester fabric rated at 600 denier.
  2. The bag must hold a 15 mm thick laptop plus three A4 files.
  3. The bag must have a reflective strip at least 25 mm wide.
  4. The bag is intended for senior secondary learners who cycle to school. Correct answer.

Explanation

A design brief states the problem, the target user and the general purpose in broad terms, leaving the designer free to explore solutions. Measurable requirements such as capacity, material grade and strip width are specification points that come later, once the concept has been chosen.

Question 2Design process and problem solving

Which activity is the main purpose of producing a design specification?

  1. To record the measurable requirements against which design ideas can be judged Correct answer.
  2. To list the tools and machines needed in the workshop
  3. To show the client the final appearance of the chosen product
  4. To calculate the total manufacturing cost of the product

Explanation

The specification translates the brief into a set of testable criteria such as size, strength, cost limits and safety needs. Each idea can then be evaluated against those criteria, which makes the choice of a final solution reasoned rather than a matter of preference.

Question 3Design process and problem solving

During idea generation a designer writes down every possible solution without judging any of them. Which technique is being used?

  1. Quality function deployment
  2. Brainstorming Correct answer.
  3. Critical path analysis
  4. Value analysis

Explanation

Brainstorming deliberately separates idea generation from evaluation so that quantity and variety come first and criticism comes later. Judging ideas too early tends to suppress unusual solutions that may turn out to be the most original.

Question 4Design process and problem solving

A designer builds a full-size shape from card and tape to check how a chair backrest feels against the spine. This model is best described as which type?

  1. An ergonomic model used for user testing Correct answer.
  2. A scale model used for appearance testing
  3. A mathematical model used for stress prediction
  4. A production prototype used for tooling decisions

Explanation

An ergonomic model is full size and focuses on how the human body interacts with the product, so comfort and reach can be judged directly. Appearance, calculation and tooling questions are answered by other model types.

Question 5Design process and problem solving

Which drawing convention allows a manufacturer to read dimensions directly from a scaled illustration of a component?

  1. An exploded pictorial view
  2. An isometric sketch with freehand proportions
  3. A dimensioned orthographic drawing Correct answer.
  4. A mood board of reference images

Explanation

A dimensioned orthographic drawing shows true views with written measurements, so the reader never has to scale from the paper. This makes it the standard communication for manufacture and inspection.

Question 6Design process and problem solving

In the design process, what is the main purpose of evaluating a developed solution against the specification?

  1. To prove the designer's first idea was the best one
  2. To replace the need for any further testing of the product
  3. To decide which workshop tools will be used to make it
  4. To identify where the solution fails to meet criteria and needs modification Correct answer.

Explanation

Evaluation compares the outcome with the measurable criteria set earlier in the specification, exposing weaknesses that drive modification. It is a cyclical step that feeds back into design rather than a final proof of success.

Question 7Design process and problem solving

Which source of information is most reliable when a designer needs current legal safety requirements for a child's toy?

  1. A social media review of similar toys
  2. A national standards or government regulator publication Correct answer.
  3. A supplier's verbal recommendation
  4. A manufacturer's advertising brochure

Explanation

Legal safety requirements are set out by government regulators and published national standards, which are authoritative and kept up to date. Commercial and informal sources may be biased, outdated or simply wrong about the law.

Question 8Design process and problem solving

A designer lists the tasks of a project, then draws them as boxes linked by arrows to show which tasks must finish before others can start. Which planning tool is this?

  1. A Gantt chart
  2. A network diagram Correct answer.
  3. A flow chart of material flow
  4. A production flow process chart

Explanation

A network diagram shows logical dependencies between tasks, so the sequence and the critical path can be identified. A Gantt chart instead places tasks against a calendar time scale.

Question 9Design process and problem solving

A design team is choosing between three concepts for a water carrier. Which approach best supports a fair, reasoned selection?

  1. Selecting the cheapest concept without further checks
  2. Weighting the specification criteria and scoring each concept against them Correct answer.
  3. Choosing the concept that looks most modern in the sketch
  4. Choosing the concept the team leader prefers

Explanation

Weighted scoring against agreed criteria makes the decision transparent and comparable, because criteria that matter more carry more influence. It also records the reasoning so the choice can be defended and reviewed.

Question 10Design process and problem solving

A designer wants to find out how often a new kettle handle is likely to slip during use. Which research method gives the most direct evidence?

  1. Reading the manufacturer's data sheet for the plastic
  2. Observing and recording users filling and pouring with a prototype Correct answer.
  3. An online survey asking people whether they like the kettle
  4. Measuring the tensile strength of the handle material

Explanation

Observing real users performing the actual task with a prototype records the behaviour directly, including slips and grip adjustments. Surveys record opinions, and material tests say nothing about how a hand interacts with the handle.

Question 11Design process and problem solving

A prototype lamp fails a drop test because the joint cracks. Which response best fits the iterative nature of design?

  1. Increase the advertised strength claim of the lamp
  2. Ignore the failure because the lamp works when stationary
  3. Redesign the joint, then rebuild and retest the prototype Correct answer.
  4. Abandon the design and start a completely different product

Explanation

Iteration means using test evidence to modify the design and then testing again to confirm the change worked. This loop continues until the product meets the specification.

Question 12Design process and problem solving

A client asks for a storage unit that must fit under a 720 mm desk, hold at least 30 kg and cost under N$450. Which set of these requirements forms part of the design specification?

  1. Only the client's name and contact details
  2. The height limit, load capacity and cost limit Correct answer.
  3. The designer's favourite timber species
  4. The colour of the designer's workshop walls

Explanation

Each of these is measurable and can be tested, which is exactly what specification criteria must be. They allow the finished design to be judged objectively against the client's needs.

Question 13Design process and problem solving

Why is a scale model often preferred to a full-size prototype at the early concept stage?

  1. It allows form and proportion to be judged quickly and cheaply Correct answer.
  2. It provides accurate strength data for the final material
  3. It guarantees the final product will be safe
  4. It removes the need to test the design at all

Explanation

A small model can be made rapidly from inexpensive materials, so several concept forms can be compared before committing resources. It answers questions about shape and proportion, not about structural performance.

Question 14Design process and problem solving

A designer uses a morphological chart. What does this tool produce?

  1. A single fixed solution chosen in advance
  2. A grid of sub-solutions combined into new overall concepts Correct answer.
  3. A list of the costs of each material
  4. A timetable of production stages

Explanation

A morphological chart lists the sub-functions of a product and possible means of achieving each one. Combining different means across the rows generates many complete concept options that might not otherwise be considered.

Question 15Design process and problem solving

A design team must present a concept to a client who cannot read technical drawings. Which presentation method communicates the overall appearance most effectively?

  1. A parts list with item numbers
  2. A tolerance table for the machined parts
  3. A dimensioned orthographic drawing
  4. A rendered pictorial view with materials and colours shown Correct answer.

Explanation

A rendered pictorial view shows the product as it would look, including form, colour and surface, which a non-technical audience can interpret immediately. Technical documents serve manufacture rather than persuasion.

Question 16Design process and problem solving

A designer is comparing two materials for a school chair frame. Which property is most directly relevant to resisting a heavy learner leaning back on the rear legs?

  1. Flexural strength Correct answer.
  2. Colour fastness
  3. Thermal conductivity
  4. Electrical resistivity

Explanation

Leaning back bends the rear legs, so the frame must resist bending forces, which is measured by flexural strength. The other properties relate to heat, colour and electricity and do not address the load case.

Question 17Design process and problem solving

A designer needs to know the exact force at which a glued timber joint fails. Which test method is appropriate?

  1. A cost comparison of two adhesives
  2. A destructive tensile test on prepared joint samples Correct answer.
  3. A visual inspection of the joint under a lamp
  4. A customer satisfaction questionnaire

Explanation

A destructive test loads prepared samples until failure and records the force, giving quantitative strength data. This allows joint types or adhesives to be compared objectively.

Question 18Design process and problem solving

During evaluation a designer finds a product meets all criteria except that assembly takes twice the allowed time. Which modification is most appropriate?

  1. Redesign the product to reduce the number of separate parts and fasteners Correct answer.
  2. Reduce the quality of the finish to save time
  3. Leave the design unchanged and accept the delay
  4. Increase the selling price to cover the extra labour

Explanation

Fewer parts and fasteners usually shorten assembly time by removing handling and joining steps, directly addressing the failed criterion. The other responses either hide the problem or damage quality without solving it.

Question 19Design process and problem solving

A designer wants to test whether two different handle diameters affect the force needed to turn a tap. Which plan produces valid comparative data?

  1. Test each handle in a different workshop on different days
  2. Test one handle once and the other five times
  3. Ask users which handle they think is easier to turn
  4. Test both handles the same number of times under identical conditions Correct answer.

Explanation

A fair test keeps every variable constant except the one being investigated, and repeats measurements equally for each condition. This controls random variation so the comparison reflects the handle diameter.

Question 20Design process and problem solving

A designer annotates a working drawing with the note 'Ø12 H7'. What does this note specify?

  1. A 12 mm hole with a specified tolerance class Correct answer.
  2. A 12 mm radius with a surface finish
  3. A 12 mm length with a thread pitch
  4. A 12 mm chamfer at 7 degrees

Explanation

The diameter symbol followed by a size gives the nominal diameter, and the H7 code states the tolerance zone for a hole. Together they tell the manufacturer the permitted size range.

Question 21Design process and problem solving

A design team must complete a product for a fixed launch date. Which planning action best protects the deadline?

  1. Removing all testing to save time
  2. Adding extra tasks to the plan to fill spare time
  3. Scheduling every task to start on the same day
  4. Identifying the critical path and monitoring those tasks closely Correct answer.

Explanation

Tasks on the critical path have no slack, so any delay to them delays the whole project. Concentrating management attention there protects the launch date.

Question 22Design process and problem solving

A designer claims a new backpack strap reduces shoulder pressure. Which evidence would most strongly support this claim?

  1. Pressure measurements from the old and new straps on the same testers Correct answer.
  2. A statement from the company sales manager
  3. A sketch showing the strap's shape
  4. Photographs of the strap in three colours

Explanation

Quantitative measurements taken on the same testers with both straps control for individual differences and give direct comparative evidence. Claims about performance require measured data, not images or opinions.

Question 23Design process and problem solving

A designer finds that a product meets every specification criterion but users consistently misuse a locking catch. What is the most appropriate conclusion?

  1. The product should be sold without any instructions
  2. The specification omitted an important usability criterion Correct answer.
  3. The locking catch should be made more decorative
  4. The specification was complete and the users are at fault

Explanation

Consistent misuse points to a design fault, which means the specification failed to capture how the product would be operated in practice. Evaluation should feed back into a revised specification that includes usability criteria.

Question 24Design process and problem solving

A designer must choose between a strong but heavy steel bracket and a lighter aluminium bracket of equal strength. Which additional consideration most affects the choice for a portable product?

  1. The mass of the finished assembly and its effect on user effort Correct answer.
  2. The melting point of each metal
  3. The cost of polishing the workshop floor
  4. The colour of each metal before painting

Explanation

For a portable product, mass directly affects how easily the user carries and handles it, so the lighter bracket offers a real benefit if strength is equal. The decision must weigh this user benefit against other factors such as cost.

Question 25Design process and problem solving

A designer plans to survey 200 learners about a new study lamp. Which sampling approach is most likely to produce results that represent the whole school?

  1. Surveying learners who stay late in the workshop
  2. Interviewing only learners who already own a lamp
  3. Selecting learners randomly across all year groups Correct answer.
  4. Questioning only the designer's close friends

Explanation

Random selection across all year groups gives every learner a chance of inclusion, which reduces bias and improves representativeness. Restricted groups share characteristics that may not reflect the wider population.

Question 26Design process and problem solving

A designer is writing a design brief at the start of a project. Which statement belongs in the brief rather than in the specification?

  1. The storage unit must fit under a 720 mm desk and hold 30 kg
  2. The shelf material must resist a 25 kg point load without permanent deflection
  3. The client wants an affordable storage unit for a school hostel room Correct answer.
  4. The unit must be finished with two coats of clear lacquer

Explanation

A design brief states the broad problem, client need and general intention, leaving the designer freedom to propose solutions. Measurable limits such as dimensions, load capacity and finish schedules are specification criteria because they can be tested against the finished product.

Question 27Design process and problem solving

A designer needs to record the shape of a chair seat so that a colleague can reproduce the curve accurately. Which technique is most suitable?

  1. A written description of the seat profile
  2. A list of the seat's main dimensions
  3. A freehand pictorial sketch with shading
  4. A profile gauge traced onto grid paper Correct answer.

Explanation

A profile gauge copies a complex curve directly, and tracing it onto grid paper gives a scaled, repeatable record of the shape. Freehand sketching and dimension lists lose the exact curvature needed for reproduction.

Question 28Design process and problem solving

A designer is analysing why a batch of school bags failed at the shoulder-strap stitching. Which action is the best first step in a structured problem-solving approach?

  1. Redesign the strap with a thicker thread immediately
  2. Ask the retailer to stop selling the bag
  3. Collect failed bags and examine where the stitching tore Correct answer.
  4. Increase the price to cover expected returns

Explanation

Structured problem solving begins with gathering evidence to define the real cause before proposing remedies. Examining the failed stitching shows whether the fault lies in thread, stitch density, seam allowance or loading, which then directs the redesign.

Question 29Design process and problem solving

A designer must decide whether a proposed bookstand meets the requirement that it stays open at any page without being held. Which evaluation method gives the most direct evidence?

  1. Comparing the stand's mass with a rival product
  2. Asking the client whether the idea looks stable
  3. Calculating the total material cost of the stand
  4. Testing the stand with books open at several page positions Correct answer.

Explanation

The requirement concerns behaviour in use, so it must be evaluated by testing the actual or prototype stand under representative conditions. Physical trials with books open at different pages show directly whether the pages stay put.

Question 30Design process and problem solving

A designer is planning a project and wants to identify which activities are most likely to delay the launch date. Which planning tool should be used, and why?

  1. A table of materials, because it lists quantities needed
  2. A Gantt chart, because it shows each task's duration against calendar time
  3. A network diagram, because it identifies the critical path of dependent tasks Correct answer.
  4. A pie chart, because it shows the proportion of the budget used

Explanation

A network diagram shows task dependencies and reveals the critical path, the sequence whose delay pushes back the whole project. Gantt charts display timing but do not by themselves highlight which slippage affects the finish date.

Question 31Communication and graphic techniques

In a pictorial drawing, which type of projection shows the three principal axes at equal angles of 120° to each other?

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

Explanation

Isometric projection is a form of axonometric projection in which the three principal axes are equally inclined, so they appear at 120° to one another on the drawing sheet. This gives equal foreshortening along all three axes and is the defining feature of isometric work.

Question 32Communication and graphic techniques

A drawing is labelled 'SCALE 1:5'. What does this mean for a component drawn 40 mm long on the sheet?

  1. The real component is 200 mm long Correct answer.
  2. The real component is 40 mm long
  3. The real component is 45 mm long
  4. The real component is 8 mm long

Explanation

A ratio of 1:5 is a reducing scale, meaning one unit on the drawing represents five units on the real object. Multiplying the drawn length of 40 mm by 5 gives a true length of 200 mm.

Question 33Communication and graphic techniques

Which line type is used to show hidden edges and internal features in an orthographic drawing?

  1. Long dash and dot chain
  2. Short evenly spaced dashes Correct answer.
  3. Continuous thick line
  4. Continuous thin line

Explanation

Hidden detail is drawn with short evenly spaced dashes so that edges not visible from the viewing direction can still be communicated. The dashes should meet at corners and not touch visible outlines.

Question 34Communication and graphic techniques

Which paper size in the ISO A series has an area of exactly one square metre?

  1. A1
  2. A2
  3. A4
  4. A0 Correct answer.

Explanation

The A series is based on A0 having an area of one square metre with sides in the ratio 1:√2. Each subsequent size is obtained by halving the previous sheet, so A1 is half a square metre and A4 is one sixteenth.

Question 35Communication and graphic techniques

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

  1. To the left of the front elevation
  2. To the right 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 plane, so the view from above is projected onto a plane below the object. The plan therefore appears below the front elevation, the reverse of third-angle practice.

Question 36Communication and graphic techniques

Which drawing instrument is most suitable for drawing a circle of 120 mm diameter accurately?

  1. French curve
  2. Bow compass Correct answer.
  3. Spring bow divider
  4. Set square

Explanation

A bow compass holds a pencil lead and a needle point and is designed to strike circles, with larger bow compasses or an extension bar covering diameters well beyond 100 mm. Dividers only transfer distances and cannot draw arcs.

Question 37Communication and graphic techniques

A designer needs to show the internal bore of a valve body clearly without adding a separate sectional view. Which convention achieves this?

  1. A hidden line drawn through the bore
  2. A break line across the body
  3. A half section with hatching on one side Correct answer.
  4. A centre line along the bore axis

Explanation

A half section removes a quarter of the object so that half the view shows the exterior and half shows the cut interior with hatching. This reveals the bore in the same view without needing a second drawing.

Question 38Communication and graphic techniques

A dimension of 45 mm is written on a drawing produced at a scale of 2:1. What length should the line representing that dimension measure on the sheet?

  1. 45 mm
  2. 90 mm Correct answer.
  3. 22.5 mm
  4. 135 mm

Explanation

A scale of 2:1 is an enlarging scale, so the drawing is twice the size of the real object. The 45 mm true dimension must therefore be drawn as 90 mm on the sheet, while the dimension text still states the true size.

Question 39Communication and graphic techniques

Which statement correctly describes the difference between a centre line and a cutting plane line on an engineering drawing?

  1. A centre line shows hidden edges, while a cutting plane line shows visible outlines
  2. A centre line marks an axis of symmetry, while a cutting plane line shows where a section is taken Correct answer.
  3. A centre line shows where a section is taken, while a cutting plane line marks an axis of symmetry
  4. A centre line marks a fold in the sheet, while a cutting plane line marks a dimension origin

Explanation

Centre lines are long-dash-dot chains used to locate axes of symmetrical features such as holes and cylinders. Cutting plane lines are heavier chains, often with arrows at the ends, that indicate the position and viewing direction of a section.

Question 40Communication and graphic techniques

A drawing shows a rectangular block in oblique projection with the front face true shape. What is the main advantage of this choice over isometric for this component?

  1. Receding edges converge to a vanishing point
  2. All three axes are foreshortened equally
  3. Circular and rectangular features on the front face stay undistorted Correct answer.
  4. Hidden detail is automatically removed

Explanation

In cavalier and cabinet oblique projection the front face is drawn parallel to the picture plane, so shapes on it keep their true size and shape. This makes oblique useful for flat components with holes or arcs on the front face.

Question 41Communication and graphic techniques

When producing a neat dimensioned drawing, which practice follows standard conventions?

  1. Extension lines crossing the arrowheads of the dimension line
  2. Overall dimensions given on every individual feature
  3. Dimension figures written across the dimension line at any angle
  4. Dimension lines placed outside the outline with arrowheads touching extension lines Correct answer.

Explanation

Dimension lines are drawn parallel to the feature and terminated by arrowheads that touch the extension lines, with figures placed above the line and readable from the bottom or right. Extension lines should stop short of the outline and not cross arrowheads.

Question 42Communication and graphic techniques

A component is symmetrical about a vertical axis and only half of it needs to be drawn in detail. Which convention is being applied?

  1. Full section
  2. Auxiliary view
  3. Developed view
  4. Half view about a centre line Correct answer.

Explanation

For symmetrical objects, half the view may be drawn up to the centre line, since the other half is a mirror image. The centre line marks the axis of symmetry and the drawing is understood to be completed by reflection.

Question 43Communication and graphic techniques

Which statement best explains why a third-angle projection is used in some countries instead of first-angle?

  1. The object is always drawn between the observer and the projection plane
  2. The view is placed on the same side as the direction from which it is seen Correct answer.
  3. The plan is always placed below the front elevation
  4. All views are drawn at a scale of 2:1

Explanation

In third-angle projection the projection plane lies between the observer and the object, so each view appears on the side from which it is viewed. The plan therefore sits above the elevation and the right-hand view sits on the right.

Question 44Communication and graphic techniques

A drawing of a bracket must show a slanted face in true shape. Which view should be added?

  1. A plan view from above
  2. An isometric view of the bracket
  3. A sectional view through the bracket
  4. An auxiliary view projected perpendicular to the slanted face Correct answer.

Explanation

An auxiliary view is projected onto a plane parallel to the inclined face, so that face appears in true shape and size. Neither the principal views nor a pictorial view can show the slanted face without distortion.

Question 45Communication and graphic techniques

Which statement correctly describes the purpose of hatching in a sectional view?

  1. It marks the centre of circular features
  2. It shows the direction of assembly of parts
  3. It indicates the solid material cut by the cutting plane Correct answer.
  4. It represents surfaces that have been machined

Explanation

Hatching consists of thin parallel lines at a consistent angle that fill the areas where the cutting plane has sliced through solid material. Adjacent parts in an assembly are hatched in opposite directions so their boundaries remain clear.

Question 46Communication and graphic techniques

A student needs to draw a smooth curve through a series of plotted points that does not follow a circular arc. Which instrument is most appropriate?

  1. T-square
  2. Bow compass
  3. French curve Correct answer.
  4. Protractor

Explanation

A French curve is a template with varying curvature that is aligned with successive groups of plotted points to draw a smooth free-flowing curve. It is chosen so that the section of the template matches the local curvature.

Question 47Communication and graphic techniques

In a perspective drawing, what is the effect of moving the station point further from the picture plane?

  1. The drawing becomes an isometric projection
  2. The vanishing points move closer together and distortion increases
  3. The perspective becomes less pronounced and lines converge more gently Correct answer.
  4. The horizon line disappears from the drawing

Explanation

Increasing the distance between the observer and the picture plane reduces the angle subtended by the object, so receding lines converge less sharply and the image approaches the appearance of a parallel projection. This is why distant objects look flatter.

Question 48Communication and graphic techniques

Why are freehand sketches often preferred over instrument drawings at the concept stage of design?

  1. They are always drawn to a stated scale
  2. They guarantee that dimensions are correct
  3. They allow rapid exploration of many ideas before committing to accurate detail Correct answer.
  4. They remove the need for any formal drawing later

Explanation

Freehand sketching is quick and flexible, letting a designer test and communicate several possible solutions cheaply before selecting one. Accurate instrument drawing and dimensioning come later, once the concept is settled.

Question 49Communication and graphic techniques

A company wants its product drawings to be exchanged reliably with suppliers using computer systems. Which standard is most relevant?

  1. ISO 14001 for environmental management
  2. ISO 2768 for general tolerances alone
  3. ISO 128 for technical drawing conventions Correct answer.
  4. ISO 9001 for quality management

Explanation

ISO 128 sets out general principles of presentation for technical drawings, including line types and views, so that drawings are interpreted consistently across organisations. Interoperability depends on shared presentation rules rather than management-system standards.

Question 50Communication and graphic techniques

A dimension is given as 50 ±0.2 mm. What does this indicate about the acceptable size of the feature?

  1. It must measure exactly 50 mm
  2. It may measure between 49.8 mm and 50.0 mm
  3. It may measure up to 50.2 mm with no lower limit
  4. It may measure between 49.8 mm and 50.2 mm Correct answer.

Explanation

The tolerance of ±0.2 mm sets an upper limit of 50.2 mm and a lower limit of 49.8 mm around the nominal size. Any size within that band is acceptable for manufacture.