An engine health monitoring system consists of a primary unit and a standby unit. the mttf of the primary unit is 1000 operating hours and the mttf of the standby unit is 333 hour when in operation and 2000 hours while in standby status. a) estimate the design life cycle of the system if specifications require a reliability of 0.9.b) whats is the system mttf?

If you were designing a bumper for a car, would you prefer it to exhibit elastic or plastic deformation? why? consider the functions of a bumper in both a minor "fender-bender" and a major collision.

List 3 options on how to reduce knocking problens during engine process,

On solidification from a melt, the polymer polyethylene forms a semi-crystalline spherulite structure. (i) sketch an individual spherulite and label the amorphous and crystalline regions. (ii) draw a schematic to show the changes in specific volume with temperature during cooling from the melt, comparing it to the theoretical extremes of fully crystalline and fully amorphous (indicate tm and tg)