4. Consider the compressor section of the GE F110-129 engine, shown below. This has a 3- stage low-pressure compressor (LPC) and a 9-stage high-pressure compressor (HPC). The overall pressure ratio is 30.7. (25 pts) a) If all 12 of the compressor stages are "equally loaded", the total pressure rise (po3/p01) across each stage is the same, and thus equal to (30.7) 1/12 = 1.33. Explain briefly but clearly why the stages in most real compressors are about equally loaded. b) If we take all 12 stages to have the same stage efficiency, namely nst = 0.96, find the total temperature rise (T03/T01) across each compressor stage. Use y = 1.38. c) List at least four physical processes that would be expected to contribute to the entropy increase across each compressor stage. d) If the total temperature of the air entering the low-pressure compressor is 300K, find the total temperature of the air exiting the high-pressure compressor.