A list of common unit operations follows: (a) Single-pipe heat exchanger; (b) Double-pipe heat exchanger; (c) Pump; (d) Gas compressor; (e) Gas turbine (expander); ( f ) Throttle valve; (g) Nozzle. Develop a simplified form of the general steady-state entropy balance appropriate to each operation. State carefully

Amass of 1.5 kg of air at 120 kpa and 24°c is contained in a gas-tight, frictionless piston-cylinder device. the air is now compressed to a final pressure of 720 kpa. during the process, heat is transferred from the air such that the temperature inside the cylinder remains constant. calculate the boundary work input during this process.

The higher the astm grain-size number, the coarser the grain is. a)-true b)-false

Inadequate stores control is not an obstacle to effective work order system. (clo4) a)-true b)-false