A-LevelComputer ScienceHardware9618/12 · Oct/Nov 2023 · Q16 Marks

A factory makes chocolate bars. The factory uses a conveyor belt that moves the products from one stage of production to the next stage.

(a)An automated system counts the number of chocolate bars made at the end of production. The system includes a sensor positioned above the conveyor belt. Identify one appropriate type of sensor that can be used.[1]
(b)A second automated system removes chocolate bars with an incorrect weight from the production line. Describe the role of an actuator in this second system.[2]
(c)(i)The factory has many different machines with embedded systems. Identify two features of embedded systems. 1 2[2]
(c)(ii)Identify one drawback of embedded systems.[1]

Mark scheme

Marking points from the official mark scheme (Oct/Nov 2023). The mark or mark type is shown in brackets.

[1] (a) infra-red / proximity (sensor)
[2] (b) Actuator generates a signal / causes an action / converts electrical energy into a mechanical force to push an arm // to open a trap door // to pick up the chocolate bar with the incorrect weight
[2] (c)(i) Dedicated to a single task // limited number of functions Built into a larger system // integrated into a larger system An embedded system must contain a processor, memory and an I/O capability // Dedicated hardware
[1] (c)(ii) Difficult to change / update the firmware by the user // Difficult to upgrade devices to take advantage of new technology Cannot be easily adapted for another task Troubleshooting faults/upgrading is a specialist task Devices are often thrown away rather than repaired as difficult to upgrade or repair

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