Catalogue data for a six-cylinder refrigerant 22 compressor operating at 29 r/s (revolution per second) indicates a refrigerating capacity of 96.4 kw and a power requirement of 28.9 kw at an evaporating temperature of 5°c and condensing temperature of 50°c. the performance data are based on 3°c liquid sub-cooling and 8°c super-heating of suction gas entering the compressor. the cylinder bore (diameter) is 67mm and piston stoke is 57mm. compute: (a) the clearance volumetric efficiency if the clearance volume is 4.8% (b) the actual volumetric efficiency (c) compression efficiency 1.

Heat is added to a piston-cylinder device filled with 2 kg of air to raise its temperature 400 c from an initial temperature of t1 27 cand pressure of pi 1 mpa. the process is isobaric process. find a)-the final pressure p2 b)-the heat transfer to the air.

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.

Brief discuss how the presence of dislocations in crystal structures can be an advantage and a disadvantage to engineer and designers.