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System Modelling 2019/2  Theoretical Questions 1
Example theoretical questions for practising for the 2nd midterm exam in System Modelling. (In the midterm exam, you get +1/4 point for each correct answer, 1/4 point for each incorrect ones, and 0 point for each question left out. You have to reach 50% of the possible points in this system. The Google Form is not able to implement this points system.)
* Required
1. An infinite loop (livelock) …
1/a … can also occur in case of a wellstructured process model.
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1 point
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1/b … cannot occur, if the process model is fully specified.
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1 point
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1/c … means that the system cannot leave a given set of states, and cannot show any input or output activities.
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1 point
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1/d … means that the system cannot leave a given part of the state space (e.g. a loop), but it can change its state inside of that part.
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1 point
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Maybe
2. Modelling tools …
2/a … can show different parts of a model with different concrete syntaxes.
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1 point
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2/b … always work with a graphical concrete syntaxes, as only code generators and programming languages have textual syntaxes.
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1 point
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2/c … differ from code generators in the sense, that modelling tools never work with concrete syntaxes, while code generators work with graphical concrete syntaxes.
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1 point
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2/d … can examine structural correctness through statical analysis of the given abstract syntax, even during editing of the model.
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1 point
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3. Runtime monitors …
3/a … only consider outputs of the system.
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1 point
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3/b … check input and output invariants during runtime.
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1 point
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3/c … can substitute testing, as they can prevent faulty operation during runtime.
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1 point
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4. Test coverage …
4/a … is the measure of the correspondence of the expected and experienced output.
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1 point
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4/b … is a value between 0 and 1.
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1 point
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4/c … can be increased through new test cases.
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1 point
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4/d … having a value of 1 means that there are surely no errors in the model/code.
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1 point
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5. Model checking …
5/a … is the random examination of a model for some inputs.
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1 point
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5/b … mathematically proves the correctness of a model.
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1 point
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5/c … requires less computational effort than running a test suite, as the model does not have to be executed.
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1 point
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5/d … can give an example, if a requirement is not met in a model.
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1 point
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6. The visitation number of an elementary activity in a process …
6/a … is the ratio between the throughput and the maximum throughput of the activity.
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1 point
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6/b … is the ratio between the throughput of the activity and of the whole process.
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1 point
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6/c … is less than or equal to the maximum throughput.
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1 point
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6/d … is equal to the arrival rate when the system is in balance.
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1 point
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7. The maximum throughput of a process composed of two elementary activites P and Q with (respectively) XP and XQ maximum throughputs, and of any control structures, is …
7/a … min(XP, XQ), if P and Q are the two branches of a forkjoin block.
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1 point
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7/b … (XP + XQ), if P and Q are in a free choice relationship.
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1 point
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7/c … is always the same as the maximum throughput of the bottleneck (P or Q).
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1 point
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7/d … is always min(XP, XQ).
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1 point
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8. We examine the shoe size, eye colour and degree level (BSc, MSc, PhD) of students.
8/a Shoe size is an ordered categorical variable.
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1 point
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8/c Degree level is an ordered categorical variable.
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1 point
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8/d Degree level is a numerical variable.
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1 point
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9. We examine the shoe size and the total exxam score of the two System Modelling midterms of students.
9/a If the two variables represented on a parallel coordinate diagram result in parallel polylines, then everyone achieved the same score as his/her shoe size.
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1 point
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9/b If the two variables represented on a parallel coordinate diagram result in parallel polylines, then the shoe size is a linear function of the total exam score.
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1 point
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9/c If the shoe size and the total exam score represented on histograms result in two identical histograms, then everyone has achieved the same score as his/her shoe size.
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1 point
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10. The median …
10/b … is always greater than the mode and less than the average.
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1 point
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10/c … appears explicitely on a boxplot.
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1 point
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Maybe
10/d … is only defined for an odd number of data elements.
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1 point
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