A gas enters a nozzle steadily at 2.21 kg/m3 and 30 m/s and leaves at 0.762 kg/m3 and 180 m/s. The area of the inlet of the nozzle is 80 cm2 . Find (a) the mass flow rate through the nozzle, and (b) the area of the exit of the nozzle.

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

During a steady flow process, the change of energy with respect to time is zero. a)- true b)- false

An ideal otto cycle with air as the working fluid has a compression ratio of 8. the minimum and maximum temperatures in the cycle are 300 k and 1340 k. use constant specific heats at room temperature to determine (a) the amount of heat transferred to the air during the heat- addition kj/kg, (b) the thermal efficiency, and (c) the thermal efficiency of a carnot cycle ope limits. process, in rating between the same temperature