# Recent questions tagged software-reliability

1
Assume that a program will experience 200 failures in infinite time. It has now experienced 100 failures. The initial failure intensity was 20 failures/CPU hr. Then the current failure intensity will be 5 failured/CPU hr 10 failured/CPU hr 20 failured/CPU hr 40 failured/CPU hr
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2
The extent to which a software performs its intended functions without failures, is termed as Robustness Correctness Reliability Accuracy
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3
A server crashes on the average once in 30 days, that is, the Mean Time Between Failures (MTBF) is 30 days. When it happens it takes 12 hours to reboot it, that is, Mean Time To Repair (MTTR) is 12 hours. The availability of server with these reliability data values is approximately. 96.3 % 97.3 % 98.3% 99.3%
4
Emergency fixes known as patches are result of Adaptive maintenance Perfective maintenance Corrective maintenance None of the above
5
Maximum possible value of reliability is $100$ $10$ $1$ $0$
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The failure intensity for a basic model as a function of failures experienced is given as $\lambda (\mu) - \lambda_0[1-(\mu)/(V_0)]$ where $\lambda_0$ is the initial failure intensity at the start of the execution, $\mu$ is the average or expected number of failures at a ... Then the decrement of failures intensity per failure will be 10 per CPU hr 0.1 per CPU hr -0.1 per CPU hr 90 per CPU hr
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Software safety is a ______ activity that focuses on the identification and assessment of potential hazards that may affect software negatively and cause an entire system to fail. Risk mitigation, monitoring and management Software quality assurance Software quality assurance Defect removal efficiency
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Match the following: a. Watson-Felix model 1. Failure intensity b. Quick-Fix model 2. Cost estimation c. Putnam resource allocation model 3. Project planning d. Logarithmetic Poisson Model 4. Maintenance \begin{array}{|l|l|l|l|l|}\hline \text{a. }& \text{Watson-Felix model} & \text{1.}& \text{Failure ... a b c d A ii i iii iv B i ii iv iii C ii i iii iv D ii iv iii i
9
Which of the following models used for software reliability Waterfall Musa COCOMO Rayleigh