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SYSTEMS PREPARATION QUESTIONS 2008  15  
V. Ryan © 20082017  
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The turnstile system continually calculates the number
of people who have entered the theme park and the number of people
leaving. This is to ensure that the total never exceeds the legal limit. A Technology pupil has devised a simple model to test his/her programming. The maximum number of people allowed through the entrance for the test run is ten. The program must calculate those entering the park and balance it with those leaving the park. The total number of those in the park must not exceed ten. 

The sequence of events are as follows; The system is switched on. The total of people in the park is set at 0. input 1 and 2 are continually checked. If input 1 detects a person entering the park then 1 is added to the total. If input 2 detects a person leaving the park 1 is subtracted from the total. If the total number of people in the park reaches 10 a solenoid locks the entrance turnstile (this stops more people entering the park) 

Write flow chart to represent the programmed sequence of events. Use the following the process / systems boxes shown below.  
DRAW YOUR FLOW CHART HERE  NOTES HERE  
POSSIBLE ANSWER  
Another Technology student has devised a flow chart for
the model of the theme entrance and exit. Carefully study each stage of
the flow chart and consider possible improvements. Explain two possible faults/problems with the flow chart. Explain / describe three possible improvements / additions to the flow chart. 

Explain / describe two possible faults / problems with the flow chart.  
FAULT / PROBLEM 1  
FAULT / PROBLEM 2  
Explain / describe three ways in which the flow chart could be improved.  
IMPROVEMENT 1  
IMPROVEMENT 2  
IMPROVEMENT 3  
POSSIBLE ANSWERS  
Explain / describe two possible
faults / problems with the flow chart.
Explain / describe three ways
in which the flow chart could be improved.


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