Several types of hydraulic turbines are identified by names, such as the kaplan turbine, francis turbine, pelton wheels, and the propeller type. using information from the web and your own words, describe these turbines and highlight their differences, including performance and applications.

Ahe-xe mixture containing a 0.75 mole fraction of helium is used for cooling electronics in an avionics application. at a temperature of 300 k and atmospheric pressure, calculate the mass fraction of helium and the mass density, molar concentration and molecular weight of the mixture. if the cooling capacity is 10 l, what is the mass of the coolant?