Asingle-cylinder, single-acting air compressor running at 300 rpm is driven by a 23 kw electric motor. the mechanical efficiency of the drive between motor and compressor is 87%. the air inlet conditions are 1.013 bar and 15 °c and the delivery pressure is 8 bar. calculate the free-air delivery in m/min, the volumetric efficiency, and the bore and stroke of the compressor. assume that the index of compression and expansion is n = 1.3, that the clearance volume is 7% of the swept volume and that the bore is equal to the stroke.

Aloaded platform of total mass 500 kg is supported by a dashpot and by a set of springs of effective stiffness 72 kn/m. it is observed that when the platform is depressed through a distance x = 12.5 cm below its equilibrium position and then released without any initial velocity; it reaches its equilibrium position in the shortest possible time without overshoot. find the position and velocity of the loaded platform 0.10 sec. after its release. if a further load of 400 kg is added to the platform, find, i) the frequency of damped vibrations, and i) the amplitude of vibration after 2 complete oscillations, given that the initial amplitude is 15 cm.

Water at 70°f and streams enter the mixing chamber at the same mass flow rate, determine the temperature and the quality of the exiting stream. 0 psia is heated in a chamber by mixing it with saturated water vapor at 20 psia. if both streams enters the mixing chamber at the same mass flow rate, determine the temperature and the quality of the existing system.

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