The three tools described below are part of a university's machine shop. Each piece of equipment is a balanced three-phase load rated at 220. Calculate the magnitude of the line current suplying these three tools and the power factor of the combined load.• Drill press: 10.2 kVA at 0.87 pf lag. • Lathe: 4.2 kW at 0.91 pf lag. • Band saw: line current 36.8 A(rms), 7.25 kVAR.

Consider a 1.2 meter high and 2 meter wide glass window whose thickness is 6 mm and thermal conductivity is 0.78 w/m °c. the room temperature is maintained at 24 °c, while the outdoor temperature is -5 °c. the convective heat transfer coefficients on the inner and outer surfaces of the window are 10 w/m2 °c and 25 w/m2 °c respectively. (a) draw the thermal resistance network, etermine the steady rate of heat transfer t e glass window (c) determine the temperature of the inner surface of the window