3. Monitoring and control
A section of Information Technology, 9626
Listing 10 of 34 questions
Chung and Fai both work at the Vacation Hotel. Chung told Fai that the hotel had just installed a car park barrier system to prevent local shoppers from using the car park. He told her that the manager had said that it was a computer-controlled system. Pressure sensors have not been used and it is impossible for the barrier to lower itself on to a car. Describe, in detail, how such a system would operate both for a guest arriving at the hotel and for a guest leaving the hotel.
9626_s20_qp_13
THEORY
2020
Paper 1, Variant 3
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Many houses in cooler countries have central heating systems. In a central heating system, microprocessors are used to control the pump which sends water from the boiler to the individual heaters. Complete the pseudocode algorithm to show the processing which takes place in this microprocessor-controlled central heating system. The algorithm must prevent attempting to switch the pump on when it is already on and attempting to switch the pump off when it is already off. You may assume temperature is the variable representing the actual temperature of the house and preset represents the required temperature of the house. REPEAT INPUT temperature IF temperature
9626_s22_qp_11
THEORY
2022
Paper 1, Variant 1
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Questions Discovered
34