A 3-phase , 1MVA, 13.8kV/4160V, 60 Hz, transformer with Y-Delta winding connection is supplying a3-phase, 0.75 p. u. load on the 4160V side of the transformer. The load has leading power factor of 0.9. It issupplied by 1 p. u. voltage on the 13.8kV side. The transformer per unit impedance is j0.12 referred to thesecondary side. a. Find the load impedance.
b. Find the input current on the primary side in real units.
c. Find the input power factor

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.