Practice Problems(1) - Recitation Group 113 THERMODYNAMICS...

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Recitation Group 113 2/24/2014 THERMODYNAMICS PRACTICE QUESTIONS (CHAPTERS 1 THROUGH 8) 1.) Water enters the diffuser in a pump casing with a velocity of 30 m/s, a pressure of 350 kPa, and a temperature of 25 C. It leaves the diffuser with a velocity of 7 m/s and a pressure of 600 kPa. Determine the exit pressure for a reversible diffuser with these inlet conditions and exit velocity. Determine the increase in enthalpy, internal energy, and entropy for the actual diffuser. (0.4255 kj/kg, 0.17475 kj/kg, 0.000586 kj/K respectively) HINT: TdS= dh – vdP; for a reversible process it becomes h2-h1 = v(P2-P1) (only if the fluid is incompressible) So, just rearrange the 1 st law. 2.) Steam at P 1 = 6000 KPa and T 1 = 400 C expands reversibly and adiabatically through a steam turbine to pressure P 2 = 60 KPa. a.) Find the exit quality and b.) The work delivered if the change in kinetic energy is neglected. (0.8448 – 880 kj/kg) 3.) A vessel having a volume of 5 m 3 contains 0.05 m 3 of saturated liquid water and 4.95 m 3 of saturated water vapor at 0.1 MPa. Heat is transferred until the vessel is filled with
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