A farmer chooses the plants that produce the sweetest tomatoes to pollinate one another over many generations. Eventually all of the offspring of his plants produce only sweeter tomatoes. What process did the farmer use to produce his new and sweeter variety of tomatoes?

The catalogue for a refrigerant 22, four-cylinder, hermetic compressor operating at 29 r/s. a condensing temperature of 40°c and an evaporating temperature of -4°c shows a refrigeration capacity of 115 kw. at this operating point, the motor (its efficiency is 90 percent) draws 34.5 kw. the bore of the cylinders is 87 mm and the piston stroke is 70 mm. the performance data are based on 8°c of sub-cooling of the liquid leaving the condenser. compute (a) the actual volumetric efficiency and (b) the compression efficiency.