A 2400 / 240 V, 60-Hz transformer has the the high-side leakage impedance is (1:2+j 2:0) Ω, the low-side leakage impedance is (0.012 + j 0.02) Ω, and Xm at the high-side is 1800 Ω. Neglect Rhe. Calculate the input voltage if the output voltage is 240 V (rms) and supplying a load of 1:5 Ω at a power factor of 0.9 (lagging)

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?