Question #173963

Note: Draw the P-V, T-S diagrams for all problems

10. An adiabatic expansion of air occurs through a nozzle (W s = 0) from 850 kPa and 75 o C to 140 kPaa. For an isentropic expansion find: specific volume (m 3 /kg m ), temperature ( o C), and velocity (m/s) at the exit section assuming initial kinetic energy is negligible.

11. 2 lb m /min of a certain gas whose R = 767 ft-lb f /lb m - o R, undergoes a steady flow isentropic process form 50 psia, 90 ft 3 /lb m and 300 ft/s, until the pressure and velocity are doubled, and the volume is reduced by one third of its initial value. Determine a) âˆ†H, b) âˆ†U, c) Work.

12. Assume 5 ft 3 /s of Hydrogen at 15 psia and 80 o F are compressed during an irreversible adiabatic

process to 90 psia and 522 o F. For a non-flow process determine a) k, b) V 2 , c) W, d) Î”U and e) Î”S.

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