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Questions and Answers

What is the voltage supplied to the microcontroller?

  • 0 V
  • 12 V
  • 5 V (correct)
  • 7 V

    • The warning sign uses lamps powered by solar energy.

    False

    What is a task an electronic engineer would complete when designing the warning sign?

    Designing the circuit to power the LEDs from the solar energy

    The bottle sensor is connected to the microcontroller through pin _______

    <p>0 or 7</p> Signup and view all the answers

    What is an economic impact of using LEDs instead of lamps in the warning sign?

    <p>Reduced cost</p> Signup and view all the answers

    The transistor is used to amplify the signal from the bottle sensor.

    <p>False</p> Signup and view all the answers

    What is an impact on the environment of using solar powered LEDs in the warning sign?

    <p>Reduced carbon emissions</p> Signup and view all the answers

    Match the components with their functions in the microcontroller based system:

    <p>Bottle sensor = Detects the presence of a bottle Transistor = Switches the pneumatic circuit on and off Microcontroller = Controls the entire system Solar panel = Provides power to the system</p> Signup and view all the answers

    What is the purpose of the pneumatic circuit in the production line?

    <p>To arrange bottles ready for packaging</p> Signup and view all the answers

    The pneumatic circuit is controlled by a manual signal.

    <p>False</p> Signup and view all the answers

    What is the source of the signal that operates the pneumatic circuit?

    <p>microcontroller</p> Signup and view all the answers

    The pneumatic circuit is used to arrange bottles ready for _________ in a production line.

    <p>packaging</p> Signup and view all the answers

    Match the components of the pneumatic circuit with their corresponding labels:

    <p>Cylinder A = 1 Cylinder B = 2 Signal from microcontroller = 3 Label 4 = 4 Label 5 = 5</p> Signup and view all the answers

    What happens if the seatbelt sensor is off?

    <p>The warning lamp will turn on</p> Signup and view all the answers

    The buzzer will turn on constantly if the seatbelt sensor is off.

    <p>False</p> Signup and view all the answers

    What is the purpose of the seatbelt sensor?

    <p>To detect if the seatbelt is being used</p> Signup and view all the answers

    The buzzer will turn on and off _______________ times over a total period of 1.8 seconds.

    <p>three</p> Signup and view all the answers

    Match the following components with their corresponding pin numbers:

    <p>Warning lamp = pin 6 Seatbelt sensor = pin 7 Buzzer = pin 8</p> Signup and view all the answers

    What is the stress of the seatbelt strap when a force is applied?

    <p>15 N mm−2</p> Signup and view all the answers

    What is the cross-sectional area of the seatbelt strap?

    <p>48 mm2</p> Signup and view all the answers

    What is the Boolean equation given in the question?

    <p>A B = Z</p> Signup and view all the answers

    Cable A has an original length of 5.5 m.

    <p>False</p> Signup and view all the answers

    What is the stretched length of Cable A?

    <p>4.5013 m</p> Signup and view all the answers

    The sign hangs from the ceiling by two ______________.

    <p>cables</p> Signup and view all the answers

    Match the following items on the sign with their corresponding types:

    <p>Tinned fruit = Type of food Tinned fish = Type of food Tinned soup = Type of food</p> Signup and view all the answers

    What is the purpose of a free body diagram?

    <p>To show the forces acting on an object</p> Signup and view all the answers

    What is the strain in Cable A?

    <p>0.00029</p> Signup and view all the answers

    The Boolean equation A B = Z represents an AND gate.

    <p>True</p> Signup and view all the answers

    What is the pressure of the air supplied to cylinder B?

    <p>0.32 N mm−2</p> Signup and view all the answers

    The outstroking force of cylinder B is 620 Pa.

    <p>False</p> Signup and view all the answers

    What is the purpose of the microcontroller based system?

    <p>To detect the bottles</p> Signup and view all the answers

    The program used to count six bottles is shown in the _______________ section.

    <p>program</p> Signup and view all the answers

    Match the line numbers with the corresponding actions in the program:

    <p>1 = Initialize the count variable 2 = Check if input2 is off 6 = Switch on 7 7 = Pause for 500 units</p> Signup and view all the answers

    What is the value of the count variable when the program jumps to label_1?

    <p>6</p> Signup and view all the answers

    What happens at line 8 of the program?

    <p>Switch off 7</p> Signup and view all the answers

    The program goes to the main loop after switching off 7.

    <p>True</p> Signup and view all the answers

    Study Notes

    Boolean Algebra

    • The Boolean equation A B = Z can be represented by a logic diagram.

    Forces and Diagrams

    • A free body diagram should include one piece of information: the forces acting on the object.
    • A sign hangs from the ceiling by two cables, A and B, with cable A having an original length of 4.5 m and stretching by 0.0013 m.
    • Strain in cable A is calculated as 0.0013/4.5.

    Flowcharts and Sequences

    • A sequence involves checking the seatbelt sensor, and if off, turning on the warning lamp and then the buzzer three times over 1.8 seconds.
    • The flowchart would include input/output connections, pin numbers, and delay units.

    Forces and Materials

    • A force of 15 N mm-2 is applied to a seatbelt strap with a cross-sectional area of 48 mm2.
    • The force applied is calculated as 15 x 48 = 720 N.

    Pneumatic Circuits

    • A pneumatic circuit is used to arrange bottles ready for packaging in a production line.
    • The circuit operates by receiving a signal from the microcontroller, which then activates cylinders A and B.
    • Air at a pressure of 0.32 N mm-2 is supplied to cylinder B, resulting in an outstroking force of 620 N.
    • The area of the piston is calculated as 620/0.32, and the diameter of the piston is calculated accordingly.

    Microcontrollers and Programming

    • A microcontroller based system is used to detect bottles and count six bottles.
    • The program uses a loop to check the input and increment a count, and then switches on a signal when the count reaches 6.
    • The program includes a time delay of 500 ms.
    • The wiring of the bottle sensor and transistor to the microcontroller is completed with reference to the program.

    Electronic Engineering and Sustainability

    • An electronic engineer would complete a task such as designing the warning sign's power supply when using solar energy.
    • Using LEDs instead of lamps in the warning sign has an economic impact of reducing energy costs.
    • Using solar powered LEDs in the warning sign has an environmental impact of reducing carbon emissions.

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