Statistics for Maintenance Modelling: Renewal Processes

# Questions on the Conditions for Block Replacement¤

What conditions do we require for block replacement to be appropriate? Click on one of the options below, then click on "Check Answer".

cf < cb
cf > cb
cf = cb
Yes, that's right. The cost of block replacement must be cheaper, otherwise failure replacement is better.
No, the cost of block replacement must be cheaper otherwise failure replacement is better.

Is the scheme appropriate for any type of failure-time distribution? Click on "Check Answer" when you've made a selection.

Yes
No
Yes, that's right. The failure time must be IFR - increasing failure rate.
I.e. the hazard rate increases with age.
No that's not right. The failure time must be IFR - increasing failure rate.
I.e. the hazard rate increases with age.