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The gas-turbine cycle of a combined gas-steam power plant has a pressure ratio of 8. Air enters the compressor at 290 K and the turbine at 1,400K. The combustion gases leaving the gas turbine are used to heat the steam at 15 MPa to ,450°C in a heat exchanger. The combustion gases leave the heat exchanger at 247°C. Steam expands in a high-pressure turbine to a pressure of 3MPa and is reheated in the combustion chamber to 500oC before it expands in a low-pressure turbine to 10 kPa. The mass flow rate of steam is 30 kg/s. Assuming all the compression and expansion processes to be isentropic, determine (a) the mass flow rate of air in the gas-turbine cycle, (6) the rate of total heat input, and (0 the thermal efficiency of the combined cycle.
A municipal water supply became contaminated with benzene (Cw=50g/L). It was decided that until the contaminant source could be identified and remediated, all household faucets would be fitted with a granular activated carbon(GAC) filter bed to ad..
A sample of 20 yields a mean 32.4. Test the two sided hypothesis that the sample drawn from a population with a mean of 35 for the following cases. (a) if a variance of the population is 33; and (b) if the variance of the population is unknown,
A dense sand has an effective friction angle of 43 and c'=0. A dry, 2.8-inch diameter sample is tested in drained triaxial shear with a confining pressure of 2500 psf. What axial load, P (in pounds), will be required to fail the sample?
A closed box with horizontal base 6m x 6m and height of 2m is half-filled with water and is accelerated Ax=4.9 m/sec^2 and Ay=-2.4 m/sec. find the pressure at the forward and rear corners along the bottom.
The pressure in the steam condenser of a nuclear power plant is 1 psia. Calculate the absolute pressure head, the gage pressure, the gage pressure head, the vacuum pressure, and the vacuum pressure head under standard conditions.
A new disinfection process destroys coliform organisms in water using completely mixed flow reactor. the reaction is first order with k=1.0 per day. The influent concentration is 100 coli/ml. The reactor volume is 400L, and the flow rate (Q) is 1,600..
A .90% Carbon hypereutectoid plain carbon steel is slowly cooled from 900 degrees C to just slighty above 723 degrees C calculate the weight percent proeutectoid cementite and weight percent austenite present in the steel.
What percent increase in shear force would be experience on the flat sides of a 40 ft long truck trailer as the truck speed increases from 65 mph to 75 mph. Kinematic viscosity of the air is 1.6x10^4 ft^2/s.
Solar cookers can be used in less developed countries for cooking and also for thermal disinfection of water. To disinfect water, the water must be heated to about 35 Celsius for 5 hours. Of course, it takes time to raise the temperature of the wa..
Briefly explain the difference between piezometer and tensiometer with respect to the working principle, special design consideration and limitation of the instrument.
Determine the pH of water in a closed Calcium Carbonate Aquifer. Assume that the temperature is again 25oC, and that the aquifer material is pure Calcium Carbonate. Again you must list all species that exist in the system and all equations.
A campus has 5000 students. After the Christmas break one student returns carrying a flu virus. Assume that the rate at which the virus spreads is proportional to the number of infected students P(t),
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