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Computational Fluid Dynamics and Heat Transfer ME 602 FINAL EXAM refresher

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ME 602 Final Refresher. ME 602 1. Convert 950R to K a. 490.33 K b. 596.44 K c. 220.33 K d. 527.44 K* 2. Find the pressure at the 80 fathom depth of water in kpag. a. 1,435.17 kpag* b. 1,693.17 kpag c. 1,742.35 kpag d. 1,293.35 kpag 3. Helium gas is compressed in an adiabatic compressor from an initial state of 14 psia and 50oF to a final temperature of 320oF in a reversible manner. Determine the exit pressure of Helium. a. 54.5 psia b. 40.49 psia* c. 35.8 psia d. 69.8 psia 4. 3.0 lbm of air are contained at 25 psia and 100 °F. Given that Rair = 53.35 ft-lbf / lbm-°F, what is the volume of the container? a. 30.7 ft3 b. 17.5 ft3 c. 24.89 ft3* d. 22.3 ft3 5. A perfect gas has a value of R= 58.8 ft-lb/lb-R and K= 1.26. if 20 Btu are added to 10 lbs of his gas at constant volume when initial temperature is 90 degF find the final temperature. a. 177 degF b. 97 degF* c. 143 degF d. 85 degF 6. A spherical balloon with a diameter of 6 m is filled with helium at 20 deg. C and 200 Kpa. Determine the mole number. a. 17.56 Kmol b. 25.39 Kmol c. 9.28 Kmol* d. 19.61 Kmol 7. Find the mass of carbon dioxide having a pressure of 20 psia at 200F with 10ft^3 volume. a. 1.34 lbs b. 1.04 lbs c. 1.24 lbs * d. 1.14 lbs 8. Steam turbine is receiving 1014 lbm/hr of steam, determine the horsepower output of the turbine if the work done by steam is 255 btu/lbm a. 102 HP* b. 462.8 HP c. 200 HP d. 6003.7 HP 9. Find the work possess for a Helium gas at 200CA. 609 KJ/kg * B. 168 KJ/kg C. 229 KJ/kg D. 339 KJ/kg 10. The gain of entropy during isothermal nonflow process of 5 lb of air at 60 is 0.462 Btu/R. Find the V1/V2. A. 3.85 B. 0.259* C. 1.0 D. 0.296 11. Oil flow through a 16 tubes on a single cooler with a velocity of 2 m/s, the internal diameter of the tube is 30mm and oil density is 0.85gm/ml. Find the volume flow in liters per sec. A. 22.62 * B. 32.22 C. 62.22 D. 42.62 12. 438K is _____˚F a 213˚F b 329˚F* c 113˚F d 1156˚F 13. Find the mass of ammonia (NH3) in a 5m3 vessel having a pressure of 120kpa and 20˚C. a 4.187 kg* b 3.763 kg c 2.837 kg d 1.563 kg 14. Find the specific volume of air having 90˚F and 15 psi condition. a 11.57 ft3/lb b 13.57 ft3/lb c 15.57 ft3/lb d 17.57 ft3/lb 15. Air at 4m3 and 120kpa undergoes an isothermal process until the pressure is 400 kpa. Find the final volume. a 1.2 m3 b 1.5 m3 c 1.8 m3 d 2.1 m3 16. A steam enters the system with enthalpy of 3300 KJ/kg at 200m/s and leaves with enthalpy at 2700 KJ/kg at 80m/s. Find the work output of the turbine. a 616.8 KJ/kg* b 313.9 KJ/kg c 442.2KJ/kg d 978 KJ/kg 17. Two pounds per second steam enters the turbine at 500ft/s with 600 Btu/lb enthalpy and leaves at 200 ft/s and 500Btu/lb. If heat loss is 5000Btu/hr, find the horsepower output of the turbine. a 458.14 b 292.92* c 478.14d 488.14 18. In a constant temperature, closed system process, 120 Btu of heat is transferred to the working fluid at 80˚F. What is the change of entropy of the working fluid, Kj/kg-K? a 0.422* b 0.522 c 0.622 d 0.722 19. Compute the mass of a 2m^3 propane at 280 kpa and 40˚C. a. 6.47 kg b. 5.1 kg c. 10.20 kg d. 9.47 kg* 20. Find the equivalent 36˚F temperature change in ˚C. a 2.22˚C b 3.33˚C c 20˚C* 21. A certain boiler has a pressure of 200 psi. If barometric pressure is 745 mm of Hg, find the absolute pressure in kpa. a 1652.45 b 1823.21 c 3846.78 d 1477.90* 22. A tank contains water having a height of 10m and oil (SG=0.9) with 4m above water surface. Find the pressure of water at the bottom of the tank. a 143.42 kpag b 123.42 kpag c 133.42 kpag* d 113.42 kpag

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