The low-side test-pressure data-plate value should be used by a technician to determine a safe pressure for:

a) recovering refrigerant.
b) leak testing.
c) refrigerant charging.
d) retrofitting a system.

Avolume of 2.65 m3 of air in a rigid, insulated container fitted with a paddle wheel is initially at 264 k, 5.6 bar. the air receives 432 kj by work from the paddle wheel. assuming the ideal gas model with cv = 0.71 kj/kg • k, determine for the air the amount of entropy produced, in kj/k