Two machines and a lighting load are connected in parallel to a 220 V, 60 Hz line. The first machine uses 310 kW of power at 81.6% power factor lagging. The second machine uses 85 kVA at 72.3% power factor leading. The lighting load consumes 55 kW. (a) Sketch and label a power triangle for each of the three devices. (b) Sketch and label a power triangle for the combined loads. (c) What is the current in the line feeding the three loads

Consider a large isothermal enclosure that is maintained at a uniform temperature of 2000 k. calculate the emissive power of the radiation that emerges from a small aperture on the enclosure surface. what is the wavelength ? , below which 10% of the emission is concentrated? what is the wavelength ? 2 above which 10% of the emission is concentrated? determine the wavelength at which maximum spectral emissive power occurs. what is the irradiation incident on a small object placed inside the enclosure?