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Recent questions tagged software-reliability

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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
asked Jan 6, 2017 in IS&Software Engineering jothee 2.3k views
1 vote
1 answer
2
The extent to which a software performs its intended functions without failures, is termed as Robustness Correctness Reliability Accuracy
asked Sep 28, 2016 in IS&Software Engineering makhdoom ghaya 742 views
1 vote
1 answer
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%
asked Aug 20, 2016 in IS&Software Engineering jothee 2.8k views
2 votes
2 answers
4
Emergency fixes known as patches are result of Adaptive maintenance Perfective maintenance Corrective maintenance None of the above
asked Aug 17, 2016 in IS&Software Engineering makhdoom ghaya 906 views
2 votes
1 answer
5
0 votes
1 answer
6
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
asked Jul 24, 2016 in IS&Software Engineering jothee 1.4k views
0 votes
1 answer
7
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
asked Jul 16, 2016 in IS&Software Engineering jothee 638 views
0 votes
1 answer
8
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
asked Jul 16, 2016 in IS&Software Engineering jothee 981 views
5 votes
4 answers
9
Which of the following models used for software reliability Waterfall Musa COCOMO Rayleigh
asked Jun 10, 2016 in IS&Software Engineering jothee 2.7k views
3 votes
1 answer
10
What is the availability of a software with the following reliability figures? Mean Time Between Failure (MTBF) = 25 days Mean Time To Repair (MTTR) = 6 hours 1% 24% 99% 99.009%
asked Nov 2, 2014 in IS&Software Engineering Ishrat Jahan 1.8k views
3 votes
2 answers
11
A software program consists of two modules M1 and M2 that can fail independently, but never simultaneously. The program is considered to have failed if any of these modules fails. Both the modules are 'repairable' and so the program starts working again as soon as the repair is done. Assume that the ... + T2R2)) ((R1R2)/(T1R1 + T2R2)) ((T1T2)/(T1T2 + T1R1 + T2R2)) ((T1T2)/(T1T2 + T1R2 + T2R1))
asked Nov 1, 2014 in IS&Software Engineering Ishrat Jahan 610 views
1 vote
1 answer
12
The following table shows the time between failures for a software system. Error Number 1 2 3 4 5 Time since last failure(hours) 6 4 8 5 6 The reliability of the system for one hour of operation assuming an exponential model is : 0.45 0.63 0.84 0.95
asked Oct 30, 2014 in IS&Software Engineering Ishrat Jahan 922 views
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