39. technician a says that some disc brake pistons may be retracted using a "c" clamp.
technician b says that some caliper pistons may be retracted using a special retracting tool.
who is correct?

Water vapor initially at 10 bar and 400 °c is contained within a piston-cylinder assembly. the water lost heat to the surrounding according to isochoric (iso-volumetric) process until its temperature is 150 °c. the water is then condensed isothermally to saturated liquid. for the water as a system, calculate the work in kj/kg