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Worksheets2022 HSC Engineering Studies Paper Theory Revision Quiz
Total questions: 40
Worksheet time: 25mins
Which of the following correctly describes the thermal toughening process for glass?
Cooling glass slowly to remove internal stresses
Heating glass to ~550–650 °C and then rapidly cooling the surface layers
Adding reinforcing fibres to glass before cooling
Applying compressive loads mechanically during shaping
In thermal toughening, why does the surface of the glass end up in compression?
The outer layers cool first and contract before the inner core, locking in compressive stresses
The inner core cools faster than the surface, creating tension on the outside
The glass is chemically treated to expand the surface
Reinforcement rods are added to the surface during cooling
What is the effect of surface compression in toughened glass?
Makes the glass more flexible but weaker in tension
Increases its resistance to surface cracks and impact forces
Reduces transparency and makes the glass opaque
Prevents the glass from shattering when overloaded
Which alternative method can also be used to manufacture toughened glass?
Extrusion
Chemical toughening
Rolling
Lamination
During thermal toughening, the glass is typically heated to which temperature range?
100–200 °C
300–400 °C
550–650 °C
900–1000 °C
What is the first step in the thermal toughening process of glass?
Rapidly cooling the surface layers
Heating the glass to about 550–650 °C
Adding reinforcing fibres
Applying compressive forces externally
In thermal toughening, why is the surface of the glass placed in compression?
The surface cools and contracts after the core
The inner hot core contracts as it cools, forcing the surface into compression
Reinforcement rods are added to the surface during manufacture
The glass is laminated with plastic layers
Which property of glass is improved by placing the surface in compression during toughening?
Transparency
Impact resistance and crack prevention
Electrical conductivity
Thermal insulation
Which of the following is an alternative method to produce toughened glass?
Annealing
Chemical toughening (ion exchange)
Extrusion
Rolling
During chemical toughening, how is the glass surface strengthened?
By replacing smaller ions in the glass with larger ions
By heating to 900 °C then cooling slowly
By coating with an external polymer
By laminating glass sheets together
During thermal toughening, the surface cools first, and the inner hot core contracts later, forcing the surface into compression.
True
False
Placing the surface of toughened glass in compression improves its __________ resistance and prevents __________.
Match the process with its description: Thermal toughening → A. Ion exchange where smaller ions are replaced by larger ions Chemical toughening → B. Heating glass to ~550–650 °C, then cooling the outer layers rapidly
Which of the following is a legal or ethical implication if a smartwatch’s GPS and heart rate functions do not provide accurate readings?
Users may lose confidence, and the company could face false advertising claims
The device becomes more energy efficient
The watch gains better durability
It reduces the overall production cost
Which of the following is an ethical issue in the design of wearable telecommunications devices?
Incorrect billing
Privacy concerns regarding user data
Extra manufacturing costs
Increasing the screen size
If a watch does not provide a reasonable service life, which implication applies?
It may breach consumer protection laws
It improves accuracy of sensors
It enhances waterproofing
It reduces legal liability
Which of the following would represent an ethical responsibility of engineers in device design?
Ensuring good instructions and ease of use for all consumers
Using cheaper materials even if durability is reduced
Designing features only for marketing appeal
Ignoring advertised performance standards
If a telecommunications device does not function according to its advertised features, what implication arises?
There is a risk of misleading consumers and legal action
The device becomes more robust in exercise environments
The design will be simpler to manufacture
Consumers benefit from improved battery performance
This formula represents: MA=L/E
Velocity Ratio
Mechanical Advantage
Efficiency
Work Done
This formula represents: VR=Number of supporting rope segments
Mechanical Advantage
Efficiency
Velocity Ratio
Effort
This formula represents: η=(VR/MA)×100%
Efficiency of a pulley system
Work input
Load carried
Energy loss
MA = L/E can be rearranged to get E=MA/L This formula is used to calculate:
The total load
The required effort
The velocity ratio
The number of supporting ropes
In pulley systems, the Velocity Ratio (VR) is determined by: VR=__________
Number of pulleys in the system
Number of ropes wound on the drum
Number of supporting rope segments
Load divided by effort
When counting rope strands for VR, you should:
Count all ropes, including the dead/anchored end
Count only ropes directly supporting the moving pulley block
Count only the ropes that pass over fixed pulleys
Always subtract one from the total number of pulleys
In a block-and-tackle with 5 pulleys (3 top, 2 bottom), the number of supporting rope segments is 4. What is the VR?
2
3
4
5
In modern bus design, windscreens that curve around the front are commonly made from which type of glass?
Tempered glass
Laminated glass
Annealed glass
Chemically toughened glass
During the manufacture of a laminated bus windscreen, how are the glass sheets shaped into a curve?
By rolling at room temperature
By heating and pressing into a mould
By chemical treatment
By cutting and joining smaller sheets
In laminated windscreens, which polymer interlayer is placed between the two glass sheets to hold them together?
Polyethylene
Polycarbonate
Polyvinyl butyral (PVB)
Epoxy resin
Why are the two curved glass sheets with polymer interlayer rolled during the laminated windscreen manufacturing process?
To increase transparency of the glass
To exclude all trapped air between the layers
To reduce weight of the windscreen
To prevent heat conduction
After rolling, what physical factor ensures that the two glass sheets and polymer interlayer remain bonded in a laminated windscreen?
Welding of the glass edges
Use of strong adhesives
Atmospheric pressure
High-voltage electrostatic bonding
Which method is most suitable for designing and simulating a new propeller prototype?
Hand sketching and timber modelling
Computer-Aided Drawing/Design (CADD)
Manual machining with lathes only
Trial-and-error testing of physical models
What is the main advantage of using CADD in aeronautical design?
It eliminates the need for any physical prototype
It allows precise drawing, simulation, and stress analysis before manufacturing
It produces prototypes instantly without cost
It guarantees the final design will never fail
After CADD is used for design, which process can be applied to construct the prototype directly from the computer model?
Computer-Aided Machining (CAM)
Sand casting
Manual filing and shaping
Extrusion
Which analysis technique can be applied to test the stresses and strains on the digital propeller design before physical manufacture?
Finite Element Analysis (FEA)
Tensile testing
Impact testing
Scanning Electron Microscopy (SEM)
Apart from CAD and CAM, which modern rapid prototyping method is often used to create physical models quickly in aeronautical engineering?
Sand moulding
3D printing
Annealing
Forging
Why might Laminated Veneer Lumber (LVL) be preferred over a steel beam as a structural member?
LVL has lower specific strength than steel
LVL has a higher specific strength than steel
LVL cannot be shaped into beams
LVL is less stable under fire
Which of the following is an advantage of LVL over steel in construction?
It requires welding for all joints
It is easier to shape and join for frame attachments
It corrodes when exposed to moisture
It cannot be manufactured from scrap material
Which property of LVL improves its sustainability compared to solid timber or steel beams?
It must be made from new, defect-free timber
It can only be sourced from imported hardwood
It is manufactured from scrap timber and can use timber with defects
It cannot be recycled after use
In terms of fire performance, why is LVL considered more suitable than a steel beam?
Steel expands and strengthens under fire
LVL chars on the outside and remains structurally stable
LVL combusts completely in a short time
Steel does not lose strength when heated
Which of the following is not a valid advantage of LVL beams compared to steel beams?
Higher specific strength
Can be made from scrap timber
More resistant/stable after fire
Always cheaper
