Amulti-plate clutch connects two in-line shafts, through 4 plates on the driving and 3 plates driven shaft. the plates have inner and outer diameters 120 and 180mm respectively, with coefficient of friction between the plates of 0.28. the clutch transmits 9 kw at 750 rev/min determine: a)- the axial force between the plates b)- the pressures at the inner and at the outer radi c)- the included angle of a cone clutch that would transmit the same power with the same axial force

Refrigerant-134a enters the compressor of a refrigerator as superheated vapor at 0.14 mpa and -10°c at a rate of 0.05 ka/s and leaves at 0.8 mpa and 50°c. the refrigerant is cooied in the condenser to 0.72 mpa and 26'c. it is then throttled to 0.15 mpa. sketch the t-s diagram for the system and evaluate: 6) the rate of heat removai from the refrigerated space (kw), it) the power input to the compressor (kw), ii) the isentropic efficiency of the compressor (%), and iv) the cop of the refrigerator.