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Module 2: Requirements & SRS

20222m

Measure of reliability is given by

(i) mean time between success
(ii) MTBF
(iii) mean reliable
(iv) MTTR

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Solution

Correct Answer: (ii) MTBF

Explanation

Reliability metrics:

  • MTBF = Mean Time Between Failures = MTTF + MTTR → overall reliability measure. Larger MTBF = more reliable.
  • MTTF = Mean Time To Failure (for non-repairable)
  • MTTR = Mean Time To Repair
  • ROCOF = Rate of Occurrence of Failures

Hence measure of reliability is given by MTBF (and also MTTF/ROCOF variants). Mean time between success and mean reliable are not standard terms.

Answer: (ii) MTBF

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