Describe the operations and list some non$-$reliability performance measures for the following engineered objects:

$($a$)$ Room air$-$conditioner.

$($b$)$ Commercial refrigerator in a restaurant.

$($c$)$ Back$-$up generator in a large hospital.

$($d$)$ Elevators in an underground mine.

$($e$)$ Food$-$processing plant.

$($f$)$ Pipe networks in an urban area.

$($g$)$ Railway infrastructure $($tracks$,$ bridges, power supply, communication sesotem$)$