CMRP Chapter 6 Questions and
Answers Updated 2026
Failure - AnswerThe loss of an asset's ability to perform its required function. Does not require the
asset to be inoperable.
Failure Rate (FR) - Answer# of failures over a period of time
Mean Time Between Failures (MTBF) - AnswerCalculated by dividing total operating time by the
number of failures over some period of time.
Mean Time to Repair (MTTR) - AnswerThis is the average time needed to restore an asset to its full
operational condition upon a failure. Time to repair an asset.
Maintainability - Answerthe ease and speed of repair and maintenance actions with which an asset
can be restored to operating conditions, following a failure. (MTTR)
Reliability - AnswerProbability that a system will perform its intended function satisfactorily for a
specified period of time under stated conditions. Measured by MTBF.
Uptime - Answerthe time during which an asset or system is either fully operational or is ready to
perform its intended function.
Why is reliability important? (5 things) - Answer1.) Customer satisfaction
2.) Reputation
3.) O & M costs
4.) Repeat business
5.) Competitive advantage
Availability equation - AnswerAvailability (A) = MTBF Uptime
----------------- = ----------------------
MTBF + MTTR Uptime + Downtime
Operating time - Answertotal defined time period
Answers Updated 2026
Failure - AnswerThe loss of an asset's ability to perform its required function. Does not require the
asset to be inoperable.
Failure Rate (FR) - Answer# of failures over a period of time
Mean Time Between Failures (MTBF) - AnswerCalculated by dividing total operating time by the
number of failures over some period of time.
Mean Time to Repair (MTTR) - AnswerThis is the average time needed to restore an asset to its full
operational condition upon a failure. Time to repair an asset.
Maintainability - Answerthe ease and speed of repair and maintenance actions with which an asset
can be restored to operating conditions, following a failure. (MTTR)
Reliability - AnswerProbability that a system will perform its intended function satisfactorily for a
specified period of time under stated conditions. Measured by MTBF.
Uptime - Answerthe time during which an asset or system is either fully operational or is ready to
perform its intended function.
Why is reliability important? (5 things) - Answer1.) Customer satisfaction
2.) Reputation
3.) O & M costs
4.) Repeat business
5.) Competitive advantage
Availability equation - AnswerAvailability (A) = MTBF Uptime
----------------- = ----------------------
MTBF + MTTR Uptime + Downtime
Operating time - Answertotal defined time period
