A blower operating at 15,000 rpm compresses air from 68 degrees F and 14.7 psia to 10psig. The desired flow is 1350 cfm and at this point, brake horsepower is 80hp. Determine the over-all blower efficiency at design point if k=1.3395. (note:use absolute pressure)

A turbine is to be selected for the following parameters: effective head of 9 m; brake power of 1200 W; the turbine is to be directly-coupled to a 10-pole alternator for 60 Hz application. Calculate the ideal power specific speed.  Hint: The alternator dictates the speed of the turbine.

How Vt=Vr × sin (70°) ? please provide explanation as fast as possible.