The MTBF Distribution of a Machine That Has Passed the Phase

question 31

Multiple Choice

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

• A) the more expensive is preventive maintenance
• B) the more likely this machine is a candidate for preventive maintenance
• C) the shorter is the time interval between breakdowns
• D) the more likely this machine will break down
• E) the more likely this machine will be maintained by a breakdown maintenance policy

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Definitions:

Ectoderm

The outermost layer of cells in the embryo of a multicellular organism, from which the nervous system, skin, and various sensory organs develop.

Hydrostatic Skeleton

A type of skeleton found in some invertebrates in which contracting muscles push against a tube of fluid.

Asexual Reproduction

The process by which an organism creates a genetically identical copy of itself without the involvement of another organism.

Choanoflagellates

A group of free-living unicellular and colonial flagellate eukaryotes considered to be the closest living relatives of the animals.