Dependability and Security MCQs

What is a Range check ?

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A. Check that the input does not exceed some maximum size e.g. 40 characters for a name
B. Check that the input falls within a known range
C. Use information about the input to check if it is reasonable rather than an extreme value
D. None of the mentioned
✅ The correct answer is option B.

Which of the following examples does not involve dependability engineering ?

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A. Medical Systems
B. Power Systems
C. Library Management
D. Telecommunications
✅ The correct answer is option C.
Explanation: Software customers expect all software to be dependable. However, for non-critical applications such as certain management systems, they may be willing to accept some system failures.

Which level of Static Analysis allows specific rules that apply to a program to be checked ?

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A. Characteristic error checking
B. User-defined error checking
C. Assertion checking
D. All of the mentioned
✅ The correct answer is option B.
Explanation: Users of a programming language define error patterns, thus extending the types of error that can be detected.

Which reliability metric sets out the probable number of system failures that are likely to be observed relative to a certain time period ?

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A. POFOD
B. ROCOF
C. AVAIL
D. None of the mentioned
✅ The correct answer is option B.
Explanation: Rate of occurrence of failures (ROCOF) sets out the probable number of system failures that are likely to be observed relative to the number of system executions.

Select the disadvantage of using Formal methods ___________________?

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A. Concurrent systems can be analysed to discover race conditions that might lead to deadlock
B. Producing a mathematical specification requires a detailed analysis of the requirements
C. They require the use of specialised notations that cannot be understood by domain experts
D. All of the mentioned
✅ The correct answer is option C.

An aircraft engine normally includes automatic fire extinguishers.What kind of dependability and security issue the example states ?

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A. Hazard avoidance
B. Damage limitation
C. Hazard detection
D. Hazard detection and removal
✅ The correct answer is option B.
Explanation: The system may include protection features that minimize the damage that may result from an accident.