valve turbine 60bar 30bar 10bar 500°C W,

Q.3 A converging-diverging nozzle is supplied by a huge air reservoir. The nozzle has a throat area of 10 cm? and an exit area of 20 cm?. The reservoir conditions are P. = 300 kPa and To = 30 °C. Determine the range of the back pressure over which (a) shocks appear in the nozzle, (b) oblique shocks form at the exit, and (c) expansion waves form. (d) Calculate the mass flow rate through the nozzle for the case in which a normal shock appears at the exit plane.

Question 2 A water pump driven by an 800 W electric motor is used to pump water from the ground level to a tank at the rate of 20000 L/hour. Water is being discharged into the tank at 10 meters above the ground; this is the maximum rise this pump can achieve. The water and the ambient temperatures are both 10 °C. The inlet and outlet pipe diameters for the pump are both 8 cm, respectively. Determine: (1)/ The average inlet linear flow velocity of the water; 2) Assuming the efficiency of the electric motor is 95%, calculate the efficieney-of the motor-pump unit; 3) The pressure difference between the inlet and the outlet of the pump.

Air at 150 kPa and 25°C is transported through a 2-inch Schedule 40 commercial steel pipe. Consider that the air behaves as an ideal gas, that the flow is adiabatic and that the Mach number under these conditions of pressure and temperature is 0.35. Calculate the length of the pipe when the air pressure and temperature decrease to 54.375 kPa and -10.6°C.