A fluid enters a steady flow apparatus with a specific volume of 0.40 m3/kg, pressure of 550 kPa, and velocity of 20 m/s, and exits with a specific volume of 0.82 m3/kg, pressure of 100 kPa, and velocity of 280 m/s. The apparatus produces 140 kJ of work per kg and experiences 12 kJ/kg of heat loss. The change in internal energy is determined to be -58.32 kJ/kg.

1. Assignment Open and Closed Thermodynamic System:
1. In a steady flow apparatus, a fluid enters with a specific volume of 0.40m3/kg, a pressure of 550 kPa and a velocity of 20 m/s. The inlet port
is 32 m above the floor and the outlet port is at the floor level. The fluid exits with a specific volume of 0.82m3/kg, a pressure of 100 kPa and
a velocity of 280 m/s. The apparatus produces 140 kJ of work per kg of fluid and a 12 kJ/kg of heat loss occurs between the inlet and outlet
ports. Determine the amount of change in internal energy in the apparatus.
a. -52.68 kJ/kg b. -65.32 kJ/kg c. -58.32 kJ/kg d. -48.33 kJ/kg
2. A fluid with a pressure of 820 kPa, specific volume of 0.30 m3/kg and a velocity of 150 m/s enters a device. The work done by the fluid is 460
kJ/kg and the heat loss due to radiation is 28 kJ/kg. The exit condition of the fluid are 130 kPa, 0.82 m3/kg and 320 m/s. Determine the
change in internal energy.
a. -351.4 kJ/kg b. -388.6 kJ/kg c. -428.5 kJ/kg d. -282.8 kJ/kg
3. A gas is contained in a 0.5 m3 rigid tank. The gas receives a paddle work of 5.5 W for 30 minutes. At initial state, the density of the gas is 1.8
kg/m3. Determine the change in specific internal energy in kJ/kg.
a. 10 kJ/kg b. 11 kJ/kg c. 12 kJ/kg d. 13 kJ/kg
4. 8 kg of steam is contained a piston-cylinder as shown in the figure below, 75 kJ of heat is transferred to the steam causing it to expand from
initial state where the specific internal energy is u1=2710.0 kJ/kg to final state where u2 = 2660.5 kJ/kg. During the process, a 20 kJ of
paddle wheel work is also added to the steam. Assuming that there is no significant change in kinetic and potential energies, determine the
work transferred by steam to the piston during the process, in kJ.
a. 430 kJ b. 452 kJ c. 520 kJ d. 491 kJ
5. A well-insulated and perfectly sealed room is installed with 4-hp fan to circulate air for 1.5 hours. Determine the increase in internal energy of
the air.
a. 4.11x107 J b. 3.32x107 J c. 1.61x107 J d. 2.21x107 J
6. A rigid container with a volume of 8ft3 contains steam with an initial specific volume of 1.2851 ft3/lbm and initial internal energy of 1150
Btu/lbm. Determine the final internal energy, in Btu/lbm if 800 Btu is added in the system.
a. 1278.51 b. 1352.11 c. 1558.22 d. 1628.62
7. Steam flowing at a rate of 3200 lbm/hr enters an adiabatic nozzle. The initial condition of steam is: P1 = 250 psi, v1=620 ft/min, v1 = 2.4
ft3/lbm and u1 = 1125.5 Btu/lbm. The steam exits at: P2 = 35 psi, v2 = 18.5 ft3/lbm and u2 = 985 Btu/lbm. Determine the exit velocity of the
steam in ft/sec.
a. 3058.11 b. 2017.88 c. 2569.57 d. 3681.88