O-LevelComputer ScienceAutomated and emerging technologies2210/12 · May/June 2017 · Q96 Marks

A cold store is kept at a constant low temperature using a sensor, a microprocessor and a cooling unit. Explain how the sensor and microprocessor will maintain a constant low temperature.

(a)Explain how the sensor and microprocessor will maintain a constant low temperature.[6]

Mark scheme

Marking points from the official mark scheme (May/June 2017). The mark or mark type is shown in brackets.

Six from: ∞ temperature sensor ∞ analogue data / temperature is converted to digital data (with an ADC) ∞ sensor sends signal to the microprocessor ∞ microprocessor compares input values with stored values/pre-set values ∞ ... if the temperature value input is too high/low ... ∞ ... a signal is sent from the microprocessor to turn on / off / up / down the cooling unit ∞ ... if temperature matches the stored values ... ∞ ... no action is taken ∞ an actuator is used to turn the cooling unit on / off / up / down ∞ the process is a continuous loop

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Topic: Automated and emerging technologies, O-Level Computer Science (syllabus 2210). Structured question, 6 marks.
Source: O-Level Computer Science, May/June 2017 Paper 1 Variant 2, question 9.

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