Author Question: The MTBF distribution of a machine that has passed the phase of early failures exhibits a normal ... (Read 67 times)

big1devin · **on:** Dec 3, 2019

Question 1

How is MTBF related to FR(N)?
◦ MTBF is measured in hours, while FR(N) is measured in years.
◦ Both MTBF and FR(N) increase when breakdown maintenance is replaced by preventive maintenance.
◦ MTBF and FR(N) are unrelated concepts.
◦ MTBF is normally distributed, with FR(%) as its mean and FR(N) as its standard deviation.
◦ MTBF is the reciprocal of FR(N).

Question 2

The MTBF distribution of a machine that has passed the phase of early failures exhibits a normal distribution. The smaller the standard deviation of this distribution
◦ the more expensive is preventive maintenance.
◦ the more likely this machine will be maintained by a breakdown maintenance policy.
◦ the more likely this machine is a candidate for preventive maintenance.
◦ the more likely this machine will break down.
◦ the shorter is the time interval between breakdowns.

cadimas · **Reply #1 on:** Dec 3, 2019

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