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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?
Low level heat energy is exhausted continually to a large body of water at the rate of 22MJ/hour. Assuming the lake temperature remains constant at 290K what is the rate of entropy change expressed
Which bearing has higher starting torque, rolling element bearing or journal bearing? Justify your answer. When would you choose pressure fed journal bearings over hydrodynamic journal bearings?
A nozzle for a carbon dioxide (CO2;) fire extinguisher is based on the following inlet conditions: pressure=2500 kPa, temperature=300oK, and velocity =25 meters per second.
To improve the efficiency of a steam boiler system which generates 1000 psia steam for refinery process use, the boiler feed water (BFW) is to be preheated to 500oF from 100oF before it enters the b
For a adiabatic steam turbine, the operating conditions are as follows: Assuming a steady state, steady flow proccess. For a power output of 20 MW, what is the mass flow rate in kg/sec?
You are designing a centrifugal compressor system to compress filtered atmospheric air at 101 kPa (absolute) to 750 kPa (absolute) discharge pressure. The steady-state inlet and outlet temperatures
A paddle wheel stirs up the water, expending 40 kJ of work while the water temperature rises to 23 degrees C. Estimate: Entropy change of the surroundings
A simple steam power system has a turbine inlet state of 6.0 MPa and 540 0C and an exhaust pressure 0.008 MPa. The cooling water in the condenser experiences a temperature rise from 20 to 27 0C and
Calculate the velocity at the exit of a diffuser when air at 100kPa and 20oC enters it with a velocity of 500m/s and exit state is 200kPa and 90oC.