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

The higher the astm grain size number, the finer the gran is. a)-true b)-false

Tom is having a problem with his washing machine. he notices that the machine vibrates violently at a frequency of 1500 rpm due to an unknown rotating unbalance. the machine is mounted on 4 springs each having a stiffness of 10 kn/m. tom wishes to add an undamped vibration absorber attached by a spring under the machine the machine working frequency ranges between 800 rpm to 2000 rpm and its total mass while loaded is assumed to be 80 kg a) what should be the mass of the absorber added to the machine so that the natural frequency falls outside the working range? b) after a first trial of an absorber using a mass of 35 kg, the amplitude of the oscillation was found to be 10 cm. what is the value of the rotating unbalance? c) using me-3.5 kg.m, find the optimal absorber (by minimizing its mass). what would be the amplitude of the oscillation of the absorber?

Asteel wire of 2 mm diameter is fixed between two points located 2 m apart. the tensile force in the wire is 250n, if its density of steel is given by 7830 kg/m3 the fundamental frequency of vibration hz? ?