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SACE Stage 2 Design, Technology and Engineering study materials
SACE Stage 2 Design, Technology and Engineering study resources

SACE Stage 2 Design, Technology and Engineering practice questions

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Question 1Design and Technology Skills and Knowledge

Which property of a material describes its ability to resist indentation or scratching?

  1. Ductility
  2. Hardness Correct answer.
  3. Elasticity
  4. Toughness

Explanation

Hardness measures how well a surface resists localised plastic deformation such as scratching or indentation. Ductility concerns stretching into wire, toughness concerns energy absorption before fracture, and elasticity concerns recovery of shape after load removal. These are distinct mechanical properties tested by different methods.

Question 2Design and Technology Skills and Knowledge

A designer needs to represent the internal structure of a component so a machinist can plan operations. Which drawing convention is most appropriate?

  1. Perspective view
  2. Isometric view
  3. Section view Correct answer.
  4. Exploded view

Explanation

A section view removes part of the object to reveal internal features such as holes, cavities and wall thickness. Isometric and perspective views show external form only, and exploded views separate parts to show assembly order. Internal geometry therefore requires a section or similar cutaway convention.

Question 3Design and Technology Skills and Knowledge

In a workshop, a component must be held securely and repeatedly located at the same position for a batch of parts. Which device is designed for this purpose?

  1. Jig Correct answer.
  2. Calliper
  3. Chuck key
  4. File

Explanation

A jig holds the workpiece and guides the cutting tool so repeated parts are located consistently. A file is a hand cutting tool, a calliper measures dimensions, and a chuck key tightens a drill chuck. Only the jig combines holding and guiding for repeatable production.

Question 4Design and Technology Skills and Knowledge

Which pair of elements are the main constituents of the alloy brass?

  1. Copper and tin
  2. Copper and zinc Correct answer.
  3. Iron and carbon
  4. Aluminium and magnesium

Explanation

Brass is an alloy of copper with zinc as the principal alloying element. Copper and tin form bronze, iron and carbon form steel, and aluminium with magnesium gives a light magnesium-aluminium alloy. Recognising these pairings is fundamental to selecting non-ferrous metals.

Question 5Design and Technology Skills and Knowledge

Which type of line is conventionally used in technical drawings to show hidden edges and features?

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

Explanation

Hidden edges are drawn with dashed lines made of short evenly spaced strokes. Continuous thick lines show visible outlines, continuous thin lines show dimension and projection lines, and chain lines show centre lines or cutting planes. Correct line type use keeps drawings unambiguous for manufacture.

Question 6Design and Technology Skills and Knowledge

What does the term ergonomics primarily concern in product design?

  1. Selecting the most durable material available
  2. Reducing the manufacturing cost of a product
  3. Making products visually appealing to consumers
  4. Fitting products to human physical and cognitive capabilities Correct answer.

Explanation

Ergonomics studies the interaction between people and products or systems, aiming to match dimensions, forces and information to human capability. Cost, material durability and aesthetics are valid design considerations but are separate from ergonomic fit. Good ergonomics improves safety, comfort and efficiency of use.

Question 7Design and Technology Skills and Knowledge

Which risk control is ranked highest in the hierarchy of control for workplace hazards?

  1. Eliminating the hazard Correct answer.
  2. Displaying warning signs
  3. Training workers in safe procedures
  4. Providing personal protective equipment

Explanation

The hierarchy of control ranks elimination of the hazard as the most effective control because the risk is removed entirely. Engineering or administrative measures such as signage and training reduce exposure but rely on behaviour. Personal protective equipment ranks lowest because it protects only the individual and depends on correct use.

Question 8Design and Technology Skills and Knowledge

In a design process, what is the main purpose of developing a design brief?

  1. To list the tools available in the workshop
  2. To record the finished product's test results
  3. To calculate the final production cost
  4. To define the problem, constraints and intended outcome Correct answer.

Explanation

A design brief establishes the problem statement, client needs, constraints and desired outcome, giving direction to all later work. Costing, testing and tool inventories occur later in the process and depend on decisions made after the brief. A clear brief helps evaluate whether proposed solutions are appropriate.

Question 9Design and Technology Skills and Knowledge

A lever has its effort applied between the fulcrum and the load. Which class of lever is this?

  1. Fourth class
  2. Third class Correct answer.
  3. First class
  4. Second class

Explanation

In a third class lever the effort sits between the fulcrum and the load, as in a pair of tweezers. First class levers place the fulcrum between effort and load, and second class levers place the load between fulcrum and effort. Only three lever classes are conventionally recognised.

Question 10Design and Technology Skills and Knowledge

A gear train has a driving gear with 15 teeth and a driven gear with 45 teeth. What is the velocity ratio of the driven gear relative to the driver?

  1. 45:1
  2. 1:3
  3. 2:1
  4. 3:1 Correct answer.

Explanation

Velocity ratio for gears equals the ratio of driven teeth to driving teeth, so 45 divided by 15 gives 3. The driven gear therefore turns three times slower than the driver while delivering three times the torque. Tooth numbers, not diameters, determine this ratio for meshing gears.

Question 11Design and Technology Skills and Knowledge

A component is subjected to a tensile force of 500 N over a cross-sectional area of 25 mm². What is the tensile stress in the material?

  1. 500 MPa
  2. 12 500 MPa
  3. 20 MPa Correct answer.
  4. 0.05 MPa

Explanation

Stress equals force divided by area, so 500 N divided by 25 mm² gives 20 N/mm², which is 20 MPa. The units are consistent because one newton per square millimetre equals one megapascal. Multiplying instead of dividing produces the very large incorrect value.

Question 12Design and Technology Skills and Knowledge

Why is a fillet radius commonly added where a shaft steps up in diameter?

  1. To reduce stress concentration at the change of section Correct answer.
  2. To increase the mass of the shaft for balance
  3. To allow the shaft to be gripped by a chuck
  4. To provide a surface for a locating pin

Explanation

An abrupt change in cross-section concentrates stress, and a fillet smooths the transition so stress lines spread more evenly. This reduces the peak stress and lowers the risk of fatigue cracking at the step. Mass balance, chuck gripping and pin location are unrelated to the fillet's purpose.

Question 13Design and Technology Skills and Knowledge

Which manufacturing process is best suited to producing a long run of identical plastic bottles with thin walls?

  1. Forging
  2. Broaching
  3. Blow moulding Correct answer.
  4. Sand casting

Explanation

Blow moulding inflates a heated plastic parison against a mould cavity, producing thin-walled hollow shapes such as bottles efficiently in large quantities. Sand casting suits metals, forging shapes solid metal, and broaching cuts internal profiles. Hollow thin-wall plastic production matches blow moulding.

Question 14Design and Technology Skills and Knowledge

A designer specifies a tolerance of 20 ± 0.2 mm on a shaft. Which statement correctly describes the permitted size range?

  1. From 20.0 mm to 20.2 mm
  2. From 19.8 mm to 20.0 mm
  3. From 19.8 mm to 20.2 mm Correct answer.
  4. From 19.6 mm to 20.4 mm

Explanation

The tolerance value of 0.2 mm is added to and subtracted from the nominal 20 mm, giving limits of 20.2 mm and 19.8 mm. The full range is therefore 19.8 mm to 20.2 mm. Applying the tolerance twice in each direction would double the permitted variation incorrectly.

Question 15Design and Technology Skills and Knowledge

When selecting a material for a bicycle frame that must be stiff, light and readily welded, which combination of properties is most relevant?

  1. Low melting point and high ductility
  2. High density and high hardness
  3. High electrical conductivity and low cost
  4. High specific stiffness and good weldability Correct answer.

Explanation

Specific stiffness relates stiffness to mass, so a high value gives a light frame that resists flexing. Weldability matters because frames are joined by welded tubes. Density, hardness, melting point and conductivity do not match the stated performance requirements.

Question 16Design and Technology Skills and Knowledge

In an orthographic projection drawing, what does the symbol of a truncated cone indicate when placed in the title block?

  1. The scale of the drawing
  2. The surface finish required
  3. The material from which the part is made
  4. The projection method used for the views Correct answer.

Explanation

The truncated cone symbol shows whether first-angle or third-angle projection has been used to arrange the views. Material, surface finish and scale are conveyed by separate notes or fields in the drawing. Correctly interpreting this symbol prevents misreading the layout of views.

Question 17Design and Technology Skills and Knowledge

A team uses a morphological chart during concept development. What is the chart used for?

  1. Documenting safety incidents during manufacture
  2. Combining alternative sub-solutions into complete design concepts Correct answer.
  3. Recording the final cost of each proposed concept
  4. Ranking team members by their contribution

Explanation

A morphological chart lists possible sub-solutions for each function and allows combinations to be formed into whole concepts. It encourages systematic exploration of alternatives rather than settling on the first idea. Costing, team ranking and incident records are unrelated to this tool.

Question 18Design and Technology Skills and Knowledge

Which control measure best reduces the risk of kickback when using a circular saw?

  1. Cleaning the saw bench after cutting
  2. Wearing hearing protection during cutting
  3. Marking the cut line with a pencil
  4. Using a riving knife and maintaining correct blade depth Correct answer.

Explanation

A riving knife prevents the kerf closing on the blade, and correct blade depth reduces the exposed blade and the chance of the workpiece lifting. Hearing protection, marking and cleaning are useful practices but do not address kickback causes. Kickback control targets the interaction between blade, material and support.

Question 19Design and Technology Skills and Knowledge

A product is to be manufactured in high volume with a complex internal cavity in metal. Which process is most appropriate?

  1. Riveting
  2. Hand forging
  3. Turning on a lathe
  4. Die casting Correct answer.

Explanation

Die casting forces molten metal into a reusable steel mould, allowing complex internal shapes to be produced rapidly at high volume. Hand forging and turning produce simpler solid forms, and riveting is a joining method. Complex cavities with high output therefore favour die casting.

Question 20Design and Technology Skills and Knowledge

A pulley system has a velocity ratio of 4 and an efficiency of 75 percent. What effort is needed to lift a load of 600 N?

  1. 450 N
  2. 150 N
  3. 800 N
  4. 200 N Correct answer.

Explanation

Mechanical advantage equals velocity ratio multiplied by efficiency, giving 4 times 0.75, which is 3. Effort is load divided by mechanical advantage, so 600 N divided by 3 equals 200 N. Ignoring efficiency would underestimate the effort required.

Question 21Design and Technology Skills and Knowledge

A cantilever beam of length 2 m carries a point load of 300 N at its free end. What is the bending moment at the fixed support?

  1. 1200 N·m
  2. 600 N·m Correct answer.
  3. 150 N·m
  4. 300 N·m

Explanation

For a cantilever with an end point load, the maximum bending moment at the support equals force multiplied by length. Multiplying 300 N by 2 m gives 600 N·m. Halving or doubling the length incorrectly changes the result, and a moment of 300 N·m would apply only if the load acted at one metre.

Question 22Design and Technology Skills and Knowledge

During evaluation of a prototype, a designer records that a handle deflects excessively under load. Which response best reflects an iterative design approach?

  1. Abandon the entire design and start a new brief
  2. Accept the prototype because it meets the aesthetic brief
  3. Increase the marketing budget for the product
  4. Revise the handle section and retest the modified prototype Correct answer.

Explanation

Iteration means using test evidence to modify the design and then re-evaluating the change. Revising the handle section and retesting directly addresses the identified weakness. Accepting a known fault, discarding the brief or changing marketing spend does not resolve the technical issue.

Question 23Design and Technology Skills and Knowledge

A steel pin of original length 50 mm stretches by 0.05 mm under load. What is the engineering strain?

  1. 0.01
  2. 0.001 Correct answer.
  3. 0.0001
  4. 0.1

Explanation

Engineering strain equals change in length divided by original length, so 0.05 mm divided by 50 mm gives 0.001. Strain is dimensionless because length units cancel. Misplacing the decimal point produces the other values, so careful unit handling matters.

Question 24Design and Technology Skills and Knowledge

A designer must join two dissimilar metals that will be disassembled for maintenance. Which joining method is most suitable?

  1. Welding
  2. Brazing
  3. Bolted connection Correct answer.
  4. Adhesive bonding

Explanation

A bolted connection is reversible, so parts can be separated for maintenance without destroying the joint. Welding, brazing and adhesive bonding create permanent joints that are difficult or impossible to dismantle without damage. Reversibility and accommodation of dissimilar metals favour mechanical fastening.

Question 25Design and Technology Skills and Knowledge

A production line reports a process capability index below 1.0 for a critical dimension. What does this indicate about the process?

  1. The process spread exceeds the tolerance and will produce defects Correct answer.
  2. The tolerance band is wider than the process variation
  3. The process is centred but slightly too slow
  4. The measurement equipment is out of calibration

Explanation

A capability index below 1.0 means the natural process spread is wider than the specified tolerance, so some output will fall outside limits. Values above 1.0 indicate the process fits within tolerance with margin. Calibration, cycle time and wider tolerances are separate issues not indicated by this value.

Question 26Design and Technology Skills and Knowledge

Which drawing convention shows a hidden internal feature of a machined part without cutting the part open?

  1. A wavy line indicating a break
  2. A solid thin line showing a fold
  3. A dashed line representing the hidden edge Correct answer.
  4. A chain line marking the centre axis

Explanation

Hidden detail is drawn with short dashed lines so that internal edges can be communicated without a section view. Centre axes use chain lines and breaks use wavy or zigzag lines, so each line type carries a distinct meaning.

Question 27Design and Technology Skills and Knowledge

A designer needs to compare three concept sketches against weighted criteria such as cost, safety and ease of manufacture. Which tool is most appropriate?

  1. A tolerance stack-up
  2. A decision matrix Correct answer.
  3. A bill of materials
  4. A Gantt chart

Explanation

A decision matrix scores each concept against weighted criteria and totals the scores, giving a transparent comparison. A Gantt chart schedules time, a bill of materials lists parts, and a tolerance stack-up analyses dimensional variation, so none of these compares concepts.

Question 28Design and Technology Skills and Knowledge

Which property of a material describes its resistance to indentation and surface scratching?

  1. Toughness
  2. Stiffness
  3. Hardness Correct answer.
  4. Ductility

Explanation

Hardness measures how well a surface resists local plastic deformation such as indentation or scratching. Ductility concerns elongation before fracture, toughness concerns energy absorbed before failure, and stiffness concerns elastic deflection under load.

Question 29Design and Technology Skills and Knowledge

In a product life cycle assessment, which stage typically accounts for the greatest share of energy use for an electric kettle?

  1. The use phase Correct answer.
  2. The raw material extraction phase
  3. The disposal phase
  4. The packaging phase

Explanation

For energy-consuming appliances, most lifetime energy is consumed while the product is used, especially where heating water repeatedly. Extraction, packaging and disposal involve smaller, one-off impacts by comparison.

Question 30Design and Technology Skills and Knowledge

Which document in a design project defines the constraints, the target user and the criteria for judging success?

  1. The assembly drawing
  2. The change order
  3. The test schedule
  4. The product design specification Correct answer.

Explanation

The product design specification translates the brief into measurable requirements, constraints and user needs that later evaluation can be judged against. Drawings, schedules and change orders support the project but do not define success criteria.

Question 31Design and Technology Skills and Knowledge

Which form of intellectual property protects the visual appearance of a manufactured product, such as its shape or surface pattern?

  1. A registered design Correct answer.
  2. A trade secret
  3. A patent
  4. A trademark

Explanation

A registered design protects the visual appearance of a product rather than its function. Patents protect how something works, trademarks protect brand identifiers, and trade secrets protect confidential know-how.

Question 32Design and Technology Skills and Knowledge

Which type of motion does a crank and slider mechanism convert a continuous rotation into?

  1. Intermittent rotary motion
  2. Oscillating angular motion
  3. Uniform circular motion
  4. Reciprocating linear motion Correct answer.

Explanation

A crank and slider converts continuous rotation of the crank into back-and-forth linear motion of the slider, as in an engine piston. The slider does not rotate, oscillate about a fixed pivot, or maintain circular motion.

Question 33Design and Technology Skills and Knowledge

Which action best demonstrates safe conduct in a school workshop before operating a pedestal drill?

  1. Removing loose clothing and securing the workpiece in a clamp Correct answer.
  2. Wearing gloves to protect the hands while drilling
  3. Leaving the chuck key in place to save time
  4. Standing beside the drill rather than in front of it

Explanation

Loose clothing can be caught in rotating machinery and an unsecured workpiece can spin or be thrown, so removing loose items and clamping the work are core controls. Gloves, a left-in chuck key and an awkward stance each create additional hazards.

Question 34Design and Technology Skills and Knowledge

A shaft must pass through a bearing with a close running fit. Which pair of limits would achieve this?

  1. Shaft 19.90 to 19.95 mm, bearing bore 20.00 to 20.02 mm
  2. Shaft 20.00 to 20.02 mm, bearing bore 20.00 to 20.02 mm
  3. Shaft 20.02 to 20.04 mm, bearing bore 20.00 to 20.02 mm
  4. Shaft 19.98 to 19.99 mm, bearing bore 20.00 to 20.02 mm Correct answer.

Explanation

A close running fit needs a small, consistent clearance in which the shaft is always slightly smaller than the bore. Only the first pair guarantees a clearance of 0.01 to 0.04 mm across all combinations.

Question 35Design and Technology Skills and Knowledge

A beam is loaded in bending. Where does the maximum bending stress occur in a symmetrical cross-section?

  1. Uniformly across the whole section
  2. At the neutral axis
  3. At the outer fibres furthest from the neutral axis Correct answer.
  4. At the centroid of the cross-section

Explanation

Bending stress varies linearly with distance from the neutral axis, so it is greatest at the outermost fibres. The neutral axis itself carries zero bending stress and the centroid lies on that axis for a symmetrical section.

Question 36Design and Technology Skills and Knowledge

A material has a Young's modulus of 200 GPa. What does this value most directly indicate?

  1. Its maximum stress before fracture
  2. Its resistance to elastic deformation under stress Correct answer.
  3. Its density relative to water
  4. Its ability to conduct heat

Explanation

Young's modulus is the ratio of stress to strain in the elastic region, so a high value means the material deflects little for a given stress. It says nothing about fracture strength, thermal conductivity or density.

Question 37Design and Technology Skills and Knowledge

A designer plans to use fused deposition modelling for a functional prototype. Which limitation most affects the choice?

  1. The process requires a rigid metal mould
  2. The process is limited to flat two-dimensional shapes
  3. The process cannot produce parts with internal voids
  4. Layer-by-layer bonding can make parts weaker across layers Correct answer.

Explanation

Fused deposition modelling builds parts in layers, and the bond between layers is typically weaker than the material in-plane, which matters for load-bearing prototypes. The process can create internal cavities, needs no mould, and builds three-dimensional forms.

Question 38Design and Technology Skills and Knowledge

A four-bar linkage is designed so the coupler can rotate fully. Which condition must be satisfied?

  1. The coupler is shorter than the frame
  2. The shortest link is the fixed frame
  3. All four links are equal in length
  4. The shortest link plus the longest link is less than or equal to the sum of the other two links Correct answer.

Explanation

Grashof's condition states that a continuous rotation is possible when the sum of the shortest and longest links does not exceed the sum of the remaining two. Whether a link can fully rotate also depends on which link is fixed.

Question 39Design and Technology Skills and Knowledge

A product must be assembled and later repaired by the user with common tools. Which design approach best supports this?

  1. Design for disassembly using standard fasteners and accessible joints Correct answer.
  2. Permanent adhesive bonding of all major components
  3. Riveting the housing closed during assembly
  4. Ultrasonic welding of the housing halves

Explanation

Design for disassembly keeps components separable with standard tools so that repair and recycling remain possible. Adhesive bonding, ultrasonic welding and riveting all create joints that are difficult or impossible to reverse.

Question 40Design and Technology Skills and Knowledge

A company wants to reduce the environmental impact of a disposable cup. Which strategy follows the waste hierarchy most directly?

  1. Adding a decorative printed sleeve
  2. Increasing the number of cups per pack
  3. Switching to a thicker single-use cup
  4. Designing a reusable cup with a take-back scheme Correct answer.

Explanation

The waste hierarchy ranks avoidance and reuse above recycling and disposal, so a reusable cup with a take-back scheme prevents waste at the source. Thicker cups, extra sleeves and larger packs all add material rather than reduce it.

Question 41Design and Technology Skills and Knowledge

A designer is selecting a motor for a hoist that must lift a 200 N load at 0.5 m/s. Ignoring losses, what minimum output power is required?

  1. 50 W
  2. 400 W
  3. 200 W
  4. 100 W Correct answer.

Explanation

Power equals force multiplied by velocity, so 200 N times 0.5 m/s gives 100 W. The result is the minimum mechanical output before allowing for friction and gear losses.

Question 42Design and Technology Skills and Knowledge

A tensile test produces a stress-strain curve. Which feature marks the onset of permanent deformation?

  1. The yield point where the curve departs from linearity Correct answer.
  2. The fracture point at the end of the curve
  3. The ultimate tensile strength peak
  4. The origin of the axes

Explanation

Up to the yield point the material behaves elastically, and beyond it deformation becomes permanent. The ultimate strength is the maximum stress reached, while fracture marks final failure.

Question 43Design and Technology Skills and Knowledge

A control system on a production line detects that a guard has been opened. Which response reflects a fail-safe design?

  1. The machine slows to half speed automatically
  2. The machine logs the event for later review
  3. The machine stops and cannot restart until the guard is closed and reset Correct answer.
  4. The machine continues but sounds a warning tone

Explanation

Fail-safe design ensures that a fault or unsafe condition brings the equipment to a safe state and prevents restart until the condition is cleared. Warning, slowing or logging alone leave the hazard active.

Question 44Design and Technology Skills and Knowledge

A team must reduce the mass of a bracket without increasing stress beyond allowable limits. Which change is most effective?

  1. Increasing the section depth in the region of highest bending moment Correct answer.
  2. Changing the surface finish to a gloss coating
  3. Replacing bolts with adhesively bonded joints
  4. Reducing the fillet radius at the internal corners

Explanation

Bending stress falls as the section modulus increases, and section depth raises the modulus strongly, so adding depth where the moment is greatest reduces stress for the same load. This allows material to be removed elsewhere while keeping stress acceptable.

Question 45Design and Technology Skills and Knowledge

During a design review, a prototype fails a drop test at a corner. Which next step best reflects an iterative design process?

  1. Accept the failure because the test was severe
  2. Identify the failure mode, modify the design and retest Correct answer.
  3. Abandon the project and restart the brief
  4. Increase the marketing budget for the product

Explanation

Iteration uses test evidence to diagnose the failure mode, revise the design and verify the change with further testing. Abandoning the brief, spending on marketing or accepting a known failure does not resolve the underlying problem.

Question 46Design and Technology Skills and Knowledge

A gear pair is to transmit motion between parallel shafts with a smooth, quiet action at moderate speed. Which gear type is most suitable?

  1. Rack and pinion
  2. Helical gears Correct answer.
  3. Worm gears
  4. Bevel gears

Explanation

Helical gears have angled teeth that engage gradually, giving smoother and quieter running than spur gears on parallel shafts. Worm gears suit non-parallel shafts at high ratios, bevel gears suit intersecting shafts, and rack and pinion converts rotation to linear motion.

Question 47Design and Technology Skills and Knowledge

A simply supported beam of span 4 m carries a uniformly distributed load of 8 kN/m. What is the maximum bending moment?

  1. 64 kN·m
  2. 8 kN·m
  3. 32 kN·m
  4. 16 kN·m Correct answer.

Explanation

For a simply supported beam with a uniformly distributed load, the maximum moment is wL²/8, giving 8 × 16 / 8 = 16 kN·m at midspan. The reactions are 16 kN each, and the moment is the area under the shear diagram.

Question 48Design and Technology Skills and Knowledge

A component is to be produced in large numbers with tight dimensional control and a good surface finish from a metal. Which process is most appropriate?

  1. Forging of a near-net shape with no finishing
  2. Hand lay-up of composite cloth
  3. Die casting followed by a light machining pass Correct answer.
  4. Sand casting with no secondary operations

Explanation

Die casting gives high-volume, repeatable metal parts with good as-cast detail, and a light machining pass brings critical dimensions within tight tolerance and improves finish. Sand casting is slower and less precise, while hand lay-up and unfinished forging do not deliver the required control.

Question 49Design and Technology Skills and Knowledge

A pin jointed truss member carries a compressive load and is slender relative to its length. Which failure mode should the designer check first?

  1. Shear failure of the pin
  2. Bearing failure of the plate
  3. Tensile yielding of the member
  4. Buckling of the member Correct answer.

Explanation

A slender member in compression is governed by elastic instability, so buckling may occur well below the material's yield stress. Tensile yielding applies to tension members, while pin shear and plate bearing relate to the joint rather than the member's slenderness.

Question 50Design and Technology Skills and Knowledge

A product must operate reliably across a temperature range from -10 °C to 60 °C. Which approach best verifies the design?

  1. A visual inspection of the assembled product
  2. Environmental chamber testing at the extremes and at intermediate points Correct answer.
  3. A single test at room temperature
  4. A cost analysis of the chosen materials

Explanation

Verification against a specified range requires testing at the extremes and at representative intermediate conditions so that temperature-dependent behaviour is observed. Room-temperature testing, visual inspection and cost analysis cannot reveal thermal effects.