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Estimate when the beverage will have a temperature of 15degreeC in mins. Ignore thermal radiation and mention important approximations you must make.
What is the difference between steady state and non-steady state diffusion processes? Use mathematical expressions to explain them. List any two solutions corresponding to the non-steady state diff
What is the probability of an electron being at an energy of kT above the Fermi energy? Calculate the probability of an electron being at an energy of kT below the Fermi energy?
In a gas turbine, natural gas (methane) and stoichiometric air flow into the combustion chamber at 1000kpa, 500K. Secondary air is also at 1000kpa, 500Kpa, is added right after the combustion to res
A ship prototype is expected to travel at a speed of 15 m/s in water. Unfortunately, there is no ability to test a 1/20th scale model in water, so it is tested in a wind tunnel. What air speed woul
With well illustrated diagrams, show how the microstructure of a typical metallic material would change during annealing. Indicate also, how a typical material property such as ductility would chan
How is heat conducted in solids? Which mechanism would you expect to dominate thermal conductivity in Cu? Al2O3?
What is creep failure? Is creep failure of a material a concern at high temperatures? If so why? Explain how creep failure could be minimized. Use well known case examples.
Material A has a fracture toughness and yield stress ten times that of Material B a) Write an expression for the increase (change) in fracture stress of a part by using Material A instead of Materia
Why does necking occur during a tensile test? Use your knowledge of engineering stress and strain to explain the difference between the plots of true stress/true strain, and engineering stress/engin
If the power generated by the turbine is 7.5 MW, determine the rate of entropy generation for this process. Assume the surrounding environment is at 23°C.
After the pressures (but not the temperature) in the two chambers have equalized, the valve is closed, isolating the two systems. What is the temperature and pressure in each cylinder?
Determine (a) the exergetic effectiveness and (b) the exergy destroyed. The surrounds can be taken to be To= 20°C, Po = 100 kPa.
A rigid 1.0 m3 tank contains water initially at 120°C, with 50% liquid and 50% vapor, by volume. A pressure-relief valve on the top of the tank is set to 1.0 MPa (the tank pressure cannot exceed
A well-insulated rigid tank contains 8 kg of a saturated liquid-vapor mixture of water at 100 kPa. Initially, three quarters of the mass is in the liquid phase. An electric resistance placed in the
Air, initially at 27 degrees C, is contained in a piston-cylinder. Calculate the minimum work required to compress the air until the pressure doubles assuming the process to be?
A vapor flows through a pipe with a mass flow rate of 30 kg/min. The following properties are given at a particular cross section. Area: 10 cm2, Velocity: 60 m/s, Specific flow energy: 281.89 kJ/kg.
An ideal vapor-compression refrigeration cycle, with ammonia as the working fluid, has an evaporator temperature of -20 C, and a condenser pressure of 12 bar.
Is the heat exchanger operating in a parallel flow or in a counterflow configuration? What is the heat exchanger effectiveness? What is the NTU?
Determine the power produced and the rate of process heat supplied if only 60 percent of the steam is routed to the process heater and the remainder is expanded to the condenser pressure.
Determine 1) temperature at the outlet. 2)the velocity at the outlet. 3) ratio of the inlet to outlet area(A1/A2)
A rigid container having a volume of 1.2 m3 contains 10 percent by volume of liquid water at 100 kPa. The remaining volume is vapor at 100 kPa. How much heat must be added to the container to just
An ideal diesel cycle with a compression ratio of 17 and a cut off ratio of 2 has a temperature of 105 Fahrenheit and a pressure of 15 psia at the beginning of the isentropic compression process.
The thermal conductivity of an insulating material is found by casting a 0.1 m thick shell of the insulating material onto a hollow stainless steel sphere with an inner radius of 0.12 m and an outer
What are the higher and the lower heating values of a fuel? How do they differ? How is the heating value of a fuel related to the enthalpy of combustion of that fuel?