QI) (15-points) Argon gas (Cr=0.5203 kJ kg.K, R=0.2081 kJ kg. K) enters an adiabatic compressor at 120 kPa and 30 °C wit

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Qi 15 Points Argon Gas Cr 0 5203 Kj Kg K R 0 2081 Kj Kg K Enters An Adiabatic Compressor At 120 Kpa And 30 C Wit 1 (137.35 KiB) Viewed 24 times

QI) (15-points) Argon gas (Cr=0.5203 kJ kg.K, R=0.2081 kJ kg. K) enters an adiabatic compressor at 120 kPa and 30 °C with a velocity of 20 m s and exits at 1.2 MPa, 530 °C, and 80 m/s. The mass flow rate of the Argon 0.495 kg/s. Assuming the surroundings to be at 25 °C, determine a) the actual power input b) the minimum power input c) the rate of exergy destruction d) the second law efficiency. Q2) e the symbol of the closest answer on your answer sheet for the following problems: A heat engine receives heat from a source at 1200 K at a rate of 500 kJ/s and rejects the waste heat to a sink at 300 K. If the power output of the engine is 200 kW, the second-law efficiency of this heat engine is a) 35% b) 40% c) 53% d) 75% c) 83% جمعية المهندسين ال iletinue شعارنا الأبدان 2) A simple Brayton cycle has a pressure ratio of 5 and a maximum temperature of 900 K. Air enters the compressor at 100 kPa, 300 K. Based upon cold-air standard analysis assumptions, the back-work ratio of this cycle is a) 0.22 b) 0.36 c) 0.42 d) 0.53 e) 1.90 3) in an ideal air-standard Brayton cycle with regeneration, air is compressed from 80 kPa and 10 °C to 400 kPa and 180 °C. is heated to 450 °C in the regenerator, and then further heated to 1200 °C before entering the turbine. The effectiveness of the regenerator is a) 47% b) 89% c) 26% d) 65% c) 57% 4) In an ideal air-standard Brayton cycle for jet propulsion, air (C=1.005 KJ/kg.K) expands in a nozzle from 1098 K to 568 K. The velocity of the exhaust gases is a) 1065 ms b) 1032 m's c) 730 m/s d) 533 m/s c) 33 m/s 5) Air enters a turbojet engine at 180 m's at a rate of 20 kg/s, and exits at 850 m/s relative to the aircraft. The thrust developed by the engine is b) 34 KN c) 17 kN d) 22 KN c) 13 KN a) 0.8 KN