Mechanical
Electrotechnology
Systems Process
Non/Renewable Energy
Emerging Tech
100
Label the types of motion present in this linkage
Reciprocating
Oscillating
Rotary
100
Name all symbols present
PNP transistor
NOT gate
Buzzer
Thermistor
100
The stage of the systems engineering process where a gant chart may be used.
What is plan, fabricate and produce system?
100
Does the height of a solar panel affect the electricity generated?
Assuming nothing higher blocks sunlight at any time during the day, no.
100
Give an example of a new or emerging technology.
E.g. Virtual reality technology.
200
A measure of force turning around a point of axis.
What is moment?
200
A set of diodes arranged in a square or diamond shape within a circuit. Used to convert AC to DC, usually after a transformer.
What is Bridge rectifier?
200
List all six stages of the Systems Engineering process in order.
Identify and document problem
Research feasibility and alternatives
Design and model system
Plan, fabricate and produce system
Test, diagnose and analyse performance
Evaluate and report on system produced and production
200
This system consists of a pump, boiler, turbine and condensor. It is used in most power plants.
What is Rankine Cycle?
200
List at least three reasons and drivers for the development of new or emerging technologies.
Discoveries
New materials
Technology convergence
New manufacturing methods and processes
300
A Hydraulic jack system is filled with incompressable oil. Piston A has an area of 2m2, piston B has an area of 10m2.
If 350N of downward force is applied to piston A, calculate the upward force of piston B (ignoring the mass of the pistons). Show all working.
Pressure = Force/Area
PpistonA = PpistonB
FpistonA/ApistonA = FpistonB/ApistonB
350N/2m2 = x/10m2
175 = x/10
175x10 = x
1750N = x
300
A type of signal represented by a discrete value because it only has two different voltages, low or high.
What is digital signal?
300
List PPE required when soldering.
Must wear - glasses/goggles, enclosed shoes
Could also wear heat-proof gloves.
300
List the energy transformations that occur during the life cycle of coal power electricity.
Coal is compressed and energy is stored in chemical bonds --> Coal is burned producing heat energy to boil water --> Kinetic energy of moving steam is transferred to turbine blades --> Blades spin coil (or magnet) inducing movement of electrons and electrical energy.
300
A fridge that both cools stored goods and has wi-fi connectivity to order shopping through a touch screen.
What is technology convergence?
400
A crane is lifting a load (F2) of 5000kg, the distance from the load to fulcrum (r2) is 35m.
Calculate the weight of the counterweight (F1) if it is 20m from the fulcrum (r1) and the crane is at equilibrium.
F1r1 = F2r2
F1 x 20m = 5000kg x 35m
F1 = 175000/20
F1 = 8750kg
400
A ceramic disc capacitor reads 471. How many Pico-Farads of charge can it hold?
A resistor has the following coloured bands: red, yellow, yellow and silver. What is the resistive value?
470 pF
240,000 Ohms
400
Explain why it is important to re-evaluate, modify and document changes to initial designs and plans?
When creating a system, engineers must continuously refer to the systems engineering process. They may need to trial and test subsystems and components. This may involve commencing the creation of the system, re-evaluating and then returning to planning and initiating a more appropriate selection of components or materials.
Refinement of designs, plans and tools ensures the finished system closely aligns with the desired outcom of the design brief.
400
Describe how geothermal electricity is gernerated and one challenge to its use in Australia.
Hot water and/or steam are generated from heat within the earth. The hot water or steam is then used to drive turbines to produce electricity (Rankine Cycle).
The cost of drilling and casing the deep holes. There are no geothermal active sites close to large populations in Australia.
400
The number of electric vehicles on Australian roads is currently lower than in other developed countries, but the number is expected to grow as cheaper models arrive and more charging infrastructure is built.
Evaluate the potential benefits and challenges of using electric vehicles in Australia in terms of economic and environmental sustainability
Both the benefits and challenges of using electric vehicles needed to be addressed in terms of economic and environmental sustainability. Some reference to Australian conditions, such as large distances or low population density, were needed. Benefits could include:
• lower maintenance costs of EV over petrol driven vehicles
• less noise pollution
• reduced air pollution/greenhouse gas emissions. Challenges could include:
• upfront cost of purchasing an EV
• disposal of batteries
• lack of sufficient infrastructure
• charging times.
500
a belt drive has driver pulley diameter of 20mm, and a driven pulley diameter of 44mm rotating at 550 RPM. Calculate the number of rotations per second on the driver pulley
VR = diamter driven pulley/diameter driver pulley
= 44/20 = 2.2
Output RPM = initial RPM/VR
550 = RPM/2.2
550 x 2.2 = RPM
1210 = Input RPM
1210/60 = 20.167 rotations per second
500
A light bulb with a resistance of 100 ohms is connected to a 24V power supply. Calculate:
The current flow, power use and the electrical energy used by the bulb in 5 hours.
I = V/R
I = 24/100 = 0.24 A
P = V x I
P = 24 x 0.24 = 5.76 W
W = P x t
W = 5.76 x (5 x 60 x 60) = 103,680 J
500
Safety in the workshop should be high priority. List five common safe action steps, in order of before use to during and after use, that should be taken to minimise risk.
1. Identify tools or machinery
2. Identify risks associated with use and any currently implemented risk mitigation strategies
3. Identify safer alternatives, if none use tool/machine
4. Identify areas for improvement
5. Document and share changes
500
Briefly contrast cradle-to-cradle and cradle-to-grave in the design and development of a system.
C2C design ensure all parts, components and subsystems are long-lasting, recyclable and/or replaceable. C2C is a sustainable approach to design and production, but is usually expensive to implement.
C2G is less sustainable, the design may rely on single-use or disposable parts. There is likely significant waste or emissions in production of the system.
500
A manufacturing business has implemented additional automation processes in its production line. Discuss the possible positives and negatives of introducing additional automation processes in a manufacturing business.
Positives - lower costs, reduce improve worker safety, increase production output and quality.
Negatives - complex automation is costly especially initially, not adaptable, maintainence cost, job loss/displacement and potential cybersecurity risks