Computer Science · May / June 2016 · Paper 11 · Question 5
2210
As printed in the paper
The question as text
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 1 thickness of sheet in tolerance 0 thickness of sheet out of tolerance S roller speed 1 roller speed = 10 metres/second 0 roller speed <> 10 metres/second T temperature 1 temperature < 50 °C 0 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
Read automatically from the paper; the printed page above is exact.
Show the answer and mark scheme
5(a)[6]
1 mark for each correct gate, with correct source of input(s) [6]
5(b)[4]
D S T Working Space X 0 0 0 0 0 0 1 0 0 1 0 1 0 1 1 0 1 0 0 1 1 0 1 1 1 1 0 1 1 1 1 0 4 marks for 8 correct X bits 3 marks for 6 correct X bits 2 marks for 4 correct X bits 1 mark for 2 correct X bits [4]
Make a free account to save your answers and see your weak topics and ask the AI why a wrong answer is wrong.