10. Boolean logic
A section of Computer Science, 2210
Listing 10 of 36 questions
A computer-controlled machine produces plastic sheets. The thickness of each sheet must be within a certain tolerance. The sheets are kept below 50 °C as they move over rollers at 10 metres per second. Three parameters need to be monitored all the time. Parameter Description Binary value Conditions D sheet thickness thickness of sheet in tolerance thickness of sheet out of tolerance S roller speed roller speed = 10 metres/second roller speed <> 10 metres/second T temperature temperature = 50 °C An alarm, X, will sound if: thickness is in tolerance AND (roller speed <> 10 metres/second OR temperature >= 50 °C) OR roller speed = 10 metres/second AND temperature >= 50 °C Draw a logic circuit to represent the above monitoring system. D S X T Complete the truth table for the monitoring system. D S T Working Space X
2210_s16_qp_11
THEORY
2016
Paper 1, Variant 1
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A factory that manufactures cleaning products has a system that monitors conditions throughout the manufacturing process. The inputs to the system are: Input Binary value Condition A pH > 7 pH = 35 °C P Pressure > = 80 % Pressure = 80 % and the temperature > = 35 °C or • The temperature 7 Draw a logic circuit to represent the alarm system in the factory. Each logic gate must have a maximum of two inputs. A T X P Complete the truth table for the given logic problem. A T P Working space X A sensor and a microprocessor are used to monitor the pH of the cleaning products. The system records each reading that is taken. If the reading is greater than 7 a warning message is displayed on a monitor. Explain how the sensor and microprocessor are used in the system.
2210_w19_qp_13
THEORY
2019
Paper 1, Variant 3
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Questions Discovered
36