The velocity of steam leaving the nozzle of an impulse turbine is 900 m/s and the nozzle angle is 20°. the blade velocity is 300 m/s and the blade friction factor is 0.7. calculate for a mass flow rate of 1 kg/s and symmetric blading. a)-the blade inlet angle, b) the driving force on the wheel, c)-the axial thrust, d)-the diagram power, e)-the diagram efficiency.

Aloaded platform of total mass 500 kg is supported by a dashpot and by a set of springs of effective stiffness 72 kn/m. it is observed that when the platform is depressed through a distance x = 12.5 cm below its equilibrium position and then released without any initial velocity; it reaches its equilibrium position in the shortest possible time without overshoot. find the position and velocity of the loaded platform 0.10 sec. after its release. if a further load of 400 kg is added to the platform, find, i) the frequency of damped vibrations, and i) the amplitude of vibration after 2 complete oscillations, given that the initial amplitude is 15 cm.

Fluids at rest possess no flow energy. a)- true b)- false

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