ITPEC IP October 2018 Question 58
ITPEC IP October 2018 — Question 58 of 100
Availability increases when MTBF is lengthened and MTTR is shortened. Using the steady-state relation availability = MTBF/(MTBF+MTTR), longer time between failures increases operating time, while shorter repair time reduces downtime.
Answer (b)
Why not others:
- lengthening MTTR increases downtime and reduces availability
- changing MTBF does not automatically cause MTTR to change
- changing MTTR does not automatically cause MTBF to change
Key rule: Improve reliability by increasing MTBF and improve maintainability by decreasing MTTR; both changes raise availability.
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