Texas Instruments designed a switching power converter to have efficiency of 95% when output load is 100 W. The efficiency increases linearly up to 97% with 200 W output (i. e. efficiency is 96% at 150 W. and so on. Similarly, the efficiency decreases to 94% at 50 W output. The converter will be damaged whenever the power dissipated inside it exceeds 6 W. A) If the converter is intended to operate for output loads between 20 W and some maximum limit, what is the upper limit of output power that can safely be supplied? B) A purchaser of the designed converter by Texas Instrument finds that the efficiency is slightly worse than expected; it is 94.5% at 100 W, 96.5% at 200 W, and so on. What power limit will the user encounter?

Acompressor receives the shaft work to decrease the pressure of the fluid. a)- true b)- false

The sum of the normal stresses does not change as the stress state rotates through an angle. a)-trune 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?