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Practice Final Exam
• A large rocket engine delivers hydrogen at 1500°C and 3 MPa to a nozzle with an exit pressure equal to the ambient pressure of 54 kPa. If the thrust of the rocket is 2 MN what is the exit velocity and mass flow rate of hydrogen? (use k = 1.41 and R = 4124 J/kgK)
• Air, with a stagnation condition of 450 K and 250 kPa flows through a nozzle. At the location where the cross-sectional area equals 15 cm2 there is a normal shock. If the mass flow rate is 0.4 kg/s estimate the Mach number and the stagnation pressure after the shock.
• A 5-mm capillary tube is used as a viscometer. When the flow rate is 0.71 m3/hr, the measured pressure drop is 375 kPa/m. Estimate the viscosity of the fluid? Is the flow laminar? Can you estimate the density?
• Hydrogen at 20 °C and 1 atm needs to be pumped through an 85 m duct with an aspect ratio of 5:1. The flow rate is 0.7 m3/s and the pressure drop cannot exceed 80 Pa. What should the height and width of the duct be?
a piston-cylinder device contains 1m3 liquid water of saturated liquid water at 200 c. the water is expanded
consider the cuau crystal structure. it can be described as a simple cubic lattice with a basis of cu 0 0 0 cu 1 2 1 2
an ideal diesel cycle with air as the working fluid has a compression ratio of 20 and a cutoff ratio of 1.3. this cylce
When temperature increases, the equilibrium concentration of vacancies in a material
a Steel ally to be used for a spring application must have a modulus of resilience of at least 2.07 MPa. What must be the metal's minimum yield strength.
the weather drops to 5 degrees celcius t1 so to keep warm you offer to make hot soup for the entire group. the
Anti-conservationists decide to get rid of the moon. Calculate the velocity increment \Deltav required for the moon to escape earth. Lunar lovers want the moon closer to earth. Calculate the minimum total velocity increment to bring the moon closer t..
air undergoes an isentropic process from a pressure of 3 bar 20degc to a pressure of 1 bar. compute the final
a smooth nozzle with a tip diameter of 2 in. terminates a 6 in. waterline. calculate the mean velocity of efflux from
a single cycle of a ramp function of voltage versus time has the form vt 100t from -0.01 to 0.01 s. using direct
Calculate the temperature of the water exiting the absorber tubes. Calculate the rate of exergy transfer accompanying the heat transferred from the absorber tubes to the water. Calculate the amount of exergy destroyed in the absorber tubes.
The following suspension system has two support structures-a spring and a rubber pad. Vertical force F (N) acts on the moveable plate. The spring has a spring constant of k1 = 1000 N/m. The rubber pad has a spring constant of k2 = 20000 N/m. The rubb..
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