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1.Steam expands in an turbine operating in steady-state conditions with a mass flow rate of 40,000 kg/hr. The steam enters the turbine at 8 MPa and 500 C, and exits as a saturated vapor at 40 kPa. If the power generated by the turbine is 8.2 MW, what is the rate of entropy generation, assuming the surrounds are at 25 C?
2.A sealed insulated room contains 90 m^3 air at 12 C and 100 kPa. A container with 45 kg of water at 95 C is placed in the room. After heat transfer between the air and water, thermal equilibrium is reached. Assume constant specific heats at 300 K and no chane in the room air pressure. Calculate: a. The final temperature of the air and water. b. The amount of heat transferred from the water to the air. c. The entropy generated.
The total volume of a soil specimen is 120 cm3 and its total mass is 220g. Specimen porosity is 0.4 and specific gravity of solids is 2.66 Determine the following: (a) water content, (b) void ratio, (c) degree of saturation, and (d) dry density.
What are the inputs needed to determine stress a polymer with a fixed end on one side, and the other with a tension force of 50,000 lbs a year after the load is applied
The article "Leachate from Land Disposal Residential Construction Waste" (authored by W.J. Weber, Y.-C Jang, T.G. Townsend, and S. Laux, Journal of Environmental Engineering, 128(3): 237 - 245, 2002) presents a study on contamination
A pump delivers 60 degrees F water at 2000 gpm through a vertical pipeline 300 ft high. Find the minimum horsepower input to the pump. Assume that atmospheric pressure exists at both the pump inlet and the pipeline outlet.
A spherical water tank has a diameter of 10 ft. Determine how many gallons of water are contained in the tank if the tank is filled to a depth of: a) 1 foot of water measured from the bottom of the tank b) 3 feet of water measured form the bottom o..
A computer CPU chip consists of 50 g silicon,20g copper, and 50 g polyvinyl chloride (plastic). It heats from 15?C to 75?C as the computer is turned on. How much did the entropy increase
What is the equivalent amount in year 10 of an expenditure of $5,000 in year one, $8,000 in year two, and increasing by $1,000 per year through year 10 Assume the interest rate is 10% per year.
A chemical plant uses a tube-within-a-tube counterflow heat exchanger to heat air with the use of steam. During steady state operation, the air flows into the exchanger at a rate of 5,000 kg/h and a temperature of 27C and exits at a temperature..
A step-type escalator as shown is designed to transport 120 persons per minute at a constant speed v=1.5 ft/s. The overall efficiency of the escalator is estimated to be 70%, and a 200% overload is to be allowed. Assuming that the average weight per ..
Calculate the length and diameter of the reaction zone of an afterburner that treats 2000 acfm of polluted air (measured at 250 F). The gases in the after burner are at a temperature of 1400 F for a residence time of 0.50 sec.
Determine the effective size as well as the uniformity coefficient and coefficient of curvature for each soil. Determine also the percentages of gravel, sand, silt, and clay according to (a) ASTM, (b) AASHTO, (c)USCS, and (d) the British Standard.
The coefficient of static friction between the collar of mass m=2 kg and the bent bar is Us=0.35, and the collar is initially d=70 cm from the spin axis AB. Assuming the motion starts at t=0, determine the time at which the collar starts to to sli..
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