Which one of the following describes serviceability? a)- the probability that a failed component or system will be restored to a specified condition within a period of time b)- the case of repairing, maintaining an item c)- can be defined qualitatively as the amount by which the product satisfics the users (customers') requirements d)- all of the above

An air compression refrigeration system is to have an air pressure of 100 psia in the brine tank and an allowable air temperature increase of 60°f for standard vapor compression cycle temperatures of 77 f entering the expansion cylinder and 14 f entering the compression cylinder, calculate the coefficient of performance a. 2.5 b 3.3 c. 4.0 d. 5.0

Asteam is contained in a rigid tank with a volume of 1 m3. initially, the pressure and temperature are 7 bar and 500 oc, respectively. the temperature drops due to cooling process. determine: (1) the temperature at which condensation begins in °c, (2) the fraction of the total mass that has condensed when the pressure decreased to 0.5 bar. (3) the volume in m3 occupied by saturated liquid at the final state?

The sum of the normal stresses does not change as the stress state rotates through an angle. a)-trune b)- false