Air flows isentropically through a converging nozzle. At a station where the area is 0.013 ft2 , the local pressure, temperature and Mach number are 60 psia, 40 F and 0.52, respectively. Determine the Mach number at the throat, the throat area and mass flow rate when the back pressure is (a) 30 psia, (b) 45 psia.

Explain the difference laminar and turbulent flow. explain it with the shear stress and the velocity profiles.

When at a point two solid phase changes to one solid phase on cooling then it is known as a) eutectoid point b) eutectic point c) peritectic point d) peritectoid point

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.