6.86 Air is compressed in an axial-flow compressor operating at steady state from 27°C, 1 bar to a pressure of 2.1 bar. The work input required is 94.6 kJ per kg of air flowing through the compressor. Heat transfer from the compressor occurs at the rate of 14 kJ per kg at a location on the compressor's surface where the temperature is 40°C. Kinetic and potential energy changes can be ignored. Determine (a) the temperature of the air at the exit, in °C. (b) the rate at which entropy is produced within the com- pressor, in kJ/K per kg of air flowing.
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- At the beginning of each week, a machine is in one of four conditions: 1 = excellent; 2 = good; 3 = average; 4 = bad. The weekly revenue earned by a machine in state 1, 2, 3, or 4 is 100, 90, 50, or 10, respectively. After observing the condition of the machine at the beginning of the week, the company has the option, for a cost of 200, of instantaneously replacing the machine with an excellent machine. The quality of the machine deteriorates over time, as shown in the file P10 41.xlsx. Four maintenance policies are under consideration: Policy 1: Never replace a machine. Policy 2: Immediately replace a bad machine. Policy 3: Immediately replace a bad or average machine. Policy 4: Immediately replace a bad, average, or good machine. Simulate each of these policies for 50 weeks (using at least 250 iterations each) to determine the policy that maximizes expected weekly profit. Assume that the machine at the beginning of week 1 is excellent.An air flow process has a flow rate of 0.76kg/s. The power input is 30KW and the heat transfer out is 3KW. Determine the specific enthalpy change and state if it is gain or loss.Your cafeteria is serving chicken noodle soup today, which it sources from adistributor and then warms up locally in the kitchen. The soup now sits in a large bowl anda server uses a large ladle to fill the soup into the smaller bowls handed out to the students.Consider the following variables:• Outside temperature.• Duration that the soup was heated before being put in the bowl.• Temperature of the soup in a student’s bowl.• Temperature level to which the soup is warmed up.• Insulation of the bowl used for storing the soup.• Duration that the soup bowl is open when the server inserts the ladle to serve a student.Which of these variables are (a) input variables, (b) output variables, and (c) environmentalvariables?
- FJ Corporation’s electronic chip production process yields with an average life of 1,800 hours and = 100 hours. The upper and lower specification limits are 2,400 hours and 1,600 hours respectively. Is this process capable of producing electronic chips to specification?Find the discharge coefficient, threshold heat flux, combustion efficiency and emissivity factor for both propane and butane separetly. The pipe which would contain thesge gases is 30 inches in diameter and has an operating pressure of 1000psig.Output from a process contains 0.02 defective unit. Defective units that go undetected into final assemblies cost $25 each to replace. An inspection process, which would detect and remove all defectives, can be established to test these units. However, the inspector, who can test 20 units per hour, is paid $8 per hour, including fringe benefits. Should an inspection station be established to test all units? Assume that the line will operate at the same rate (i.e., the current production rate) regardless of whether or not the inspection operation is added. a-1. Without the inspector, what is the current hourly cost of defects? a-2. Should an inspection station be established to test all units based on costs alone? multiple choice Yes No a-3. If the inspection operation is added, what would be the cost to inspect each unit? Note: Round your answer to 2 decimal places. b. What would be the benefit (or loss) from establishing the inspection process? Note: Round your answer…
- Sam’s Long Life 75-watt light bulbs are designed tohave a life of 1125 hours with tolerances of 210 hours.The process that makes light bulbs has a mean of 1050hours, with a standard deviation of 55 hours. Computethe process capability ratio and the process capabilityindex, and comment on the overall capability of theprocess.Meena Chavan Corp.’s computer chip production process yields DRAM chips with an average life of 1,800hours and s = 100 hours. The tolerance upper and lowerspecification limits are 2,400 hours and 1,600 hours, respectively. Is this process capable of producing DRAM chips tospecification?. Mary and Tom operate a lemonade stand. They are concerned that the lemonade doesnot taste fresh at the end of the day. Which of the following variables is an environmental variable in their operation?a. The temperature of the lemonade when they take it out of their refrigerator in themorningb. The temperature of the air during the dayc. The temperature of the lemonaded. The temperature of the water used to make the lemonade
- You are a food specialist in a company that specializes inrefrigerated delicacies, and one of your brands requires beingmaintained at a temperature of 5°C. You determine averagewater activity (aw) at this temperature to be 0.2. One day, you are informed that the cooling systems onone of the delivery trucks carrying your company’s productsmalfunctioned while en route to its destination and it would notbe fixed until the next delivery. The driver has informed you thatthe temperature in the delivery bay of the truck is averaging55°C. You estimate a heat of sorption (Q) of 19 kJ/mol. Calculate the water activity of the brand at this elevatedtemperature and comment on it’s integrity. Should the deliverystill push through? Or should the products be recalled anddisposedWhile analyzing their annual sales data (liters of wine sold per year) for the past 30 years, a vineyard found that after taking four successive differences, the resulting data had a mean of 2458 liters and looked like a stationary process (e.g. white noise). If the actual data for the past four years were 2018 - 2134 liters, 2017 - 2403 liters, 2016 - 2076 liters, and 2015 - 2290 liters. What would be a reasonable forecast for sales in 2019? Explain.Output from a process contains 0.01 proportion of defective units. Defective units that go undetected into final assemblies cost $26 each to replace. An inspection process, which would detect and remove all defectives, can be established to test these units. The inspector, who can test 21 units per hour (which matches the current production rate), would be paid $9 per hour, including fringe benefits. Assume that the line will operate at the same rate (i.e., the current production rate) regardless of whether or not the inspection operation is added. A. Without the inspector, what is the current hourly cost of defects? (Round your answer to 2 decimal places.) B. If the inspection operation is added, what would be the cost to inspect each unit? (Round your answer to 2 decimal places.) C. What would be the benefit (or loss) from establishing the inspection process per unit? (Input the amount as a positive value. Round your answer to 2 decimal places.)